diff --git a/.github/ISSUE_TEMPLATE/bootstrap.md b/.github/ISSUE_TEMPLATE/bootstrap.md
index 8d72eae8593..344ea30e1fc 100644
--- a/.github/ISSUE_TEMPLATE/bootstrap.md
+++ b/.github/ISSUE_TEMPLATE/bootstrap.md
@@ -32,7 +32,7 @@ Describe what you expected to happen.
 Describe what actually happened.
 -->
 
-### Bootstrap configuration (config.toml)
+### Bootstrap configuration (bootstrap.toml)
 ```toml
 <config>
 ```
diff --git a/.gitignore b/.gitignore
index b8cb31e8190..a549b6e6e56 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,6 @@
 # This file should only ignore things that are generated during a `x.py` build,
 # generated by common IDEs, and optional files controlled by the user that
-# affect the build (such as config.toml).
+# affect the build (such as bootstrap.toml).
 # In particular, things like `mir_dump` should not be listed here; they are only
 # created during manual debugging and many people like to clean up instead of
 # having git ignore such leftovers. You can use `.git/info/exclude` to
@@ -34,6 +34,7 @@ Session.vim
 !/tests/run-make/thumb-none-qemu/example/.cargo
 
 ## Configuration
+/bootstrap.toml
 /config.toml
 /Makefile
 config.mk
diff --git a/.ignore b/.ignore
index 40d1513978f..b0c640fee3d 100644
--- a/.ignore
+++ b/.ignore
@@ -1,2 +1,3 @@
-# Make vscode *not* count `config.toml` as ignored, so it is included in search
+# Make vscode *not* count `bootstrap.toml` and `config.toml` as ignored, so it is included in search
+!/bootstrap.toml
 !/config.toml
diff --git a/INSTALL.md b/INSTALL.md
index a46d3d70093..30e08201d6d 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -6,9 +6,9 @@ If you just want to install Rust, check out the [README.md](README.md) instead.*
 
 The Rust build system uses a Python script called `x.py` to build the compiler,
 which manages the bootstrapping process. It lives at the root of the project.
-It also uses a file named `config.toml` to determine various configuration
+It also uses a file named `bootstrap.toml` to determine various configuration
 settings for the build. You can see a full list of options in
-`config.example.toml`.
+`bootstrap.example.toml`.
 
 The `x.py` command can be run directly on most Unix systems in the following
 format:
@@ -115,7 +115,7 @@ See [the rustc-dev-guide for more info][sysllvm].
 
 This project provides a configure script and makefile (the latter of which just
 invokes `x.py`). `./configure` is the recommended way to programmatically
-generate a `config.toml`. `make` is not recommended (we suggest using `x.py`
+generate a `bootstrap.toml`. `make` is not recommended (we suggest using `x.py`
 directly), but it is supported and we try not to break it unnecessarily.
 
 ```sh
@@ -123,7 +123,7 @@ directly), but it is supported and we try not to break it unnecessarily.
 make && sudo make install
 ```
 
-`configure` generates a `config.toml` which can also be used with normal `x.py`
+`configure` generates a `bootstrap.toml` which can also be used with normal `x.py`
 invocations.
 
 ## Building on Windows
@@ -255,7 +255,7 @@ Windows build triples are:
     - `x86_64-pc-windows-msvc`
 
 The build triple can be specified by either specifying `--build=<triple>` when
-invoking `x.py` commands, or by creating a `config.toml` file (as described in
+invoking `x.py` commands, or by creating a `bootstrap.toml` file (as described in
 [Building on a Unix-like system](#building-on-a-unix-like-system)), and passing
 `--set build.build=<triple>` to `./configure`.
 
diff --git a/RELEASES.md b/RELEASES.md
index 038d7ca639f..381b9ebc952 100644
--- a/RELEASES.md
+++ b/RELEASES.md
@@ -2282,7 +2282,7 @@ Compatibility Notes
 - [Cargo denies `CARGO_HOME` in the `[env]` configuration table. Cargo itself doesn't pick up this value, but recursive calls to cargo would, which was not intended.](https://github.com/rust-lang/cargo/pull/11644/)
 - [Debuginfo for build dependencies is now off if not explicitly set. This is expected to improve the overall build time.](https://github.com/rust-lang/cargo/pull/11252/)
 - [The Rust distribution no longer always includes rustdoc](https://github.com/rust-lang/rust/pull/106886)
-  If `tools = [...]` is set in config.toml, we will respect a missing rustdoc in that list. By
+  If `tools = [...]` is set in bootstrap.toml, we will respect a missing rustdoc in that list. By
   default rustdoc remains included. To retain the prior behavior explicitly add `"rustdoc"` to the
   list.
 
@@ -5268,7 +5268,7 @@ related tools.
 
 - [Building `rustc` from source now uses `ninja` by default over `make`.][74922]
   You can continue building with `make` by setting `ninja=false` in
-  your `config.toml`.
+  your `bootstrap.toml`.
 - [cg_llvm: `fewer_names` in `uncached_llvm_type`][76030]
 - [Made `ensure_sufficient_stack()` non-generic][76680]
 
diff --git a/REUSE.toml b/REUSE.toml
index 9e873e94eff..816c6d730c8 100644
--- a/REUSE.toml
+++ b/REUSE.toml
@@ -22,7 +22,7 @@ path = [
     "Cargo.lock",
     "Cargo.toml",
     "CODE_OF_CONDUCT.md",
-    "config.example.toml",
+    "bootstrap.example.toml",
     "configure",
     "CONTRIBUTING.md",
     "COPYRIGHT",
diff --git a/config.example.toml b/bootstrap.example.toml
similarity index 99%
rename from config.example.toml
rename to bootstrap.example.toml
index 0700a317109..294d9780716 100644
--- a/config.example.toml
+++ b/bootstrap.example.toml
@@ -5,7 +5,7 @@
 #
 # All options are commented out by default in this file, and they're commented
 # out with their default values. The build system by default looks for
-# `config.toml` in the current directory of a build for build configuration, but
+# `bootstrap.toml` in the current directory of a build for build configuration, but
 # a custom configuration file can also be specified with `--config` to the build
 # system.
 
@@ -16,7 +16,7 @@
 # Use different pre-set defaults than the global defaults.
 #
 # See `src/bootstrap/defaults` for more information.
-# Note that this has no default value (x.py uses the defaults in `config.example.toml`).
+# Note that this has no default value (x.py uses the defaults in `bootstrap.example.toml`).
 #profile = <none>
 
 # Keeps track of major changes made to this configuration.
@@ -346,7 +346,7 @@
 # Enable a build of the extended Rust tool set which is not only the compiler
 # but also tools such as Cargo. This will also produce "combined installers"
 # which are used to install Rust and Cargo together.
-# The `tools` (check `config.example.toml` to see its default value) option specifies
+# The `tools` (check `bootstrap.example.toml` to see its default value) option specifies
 # which tools should be built if `extended = true`.
 #
 # This is disabled by default.
diff --git a/src/bootstrap/README.md b/src/bootstrap/README.md
index f036603ee70..f9d7c811f60 100644
--- a/src/bootstrap/README.md
+++ b/src/bootstrap/README.md
@@ -163,7 +163,7 @@ compiler, which will then build the bootstrap binary written in Rust.
 
 Because there are two separate codebases behind `x.py`, they need to
 be kept in sync. In particular, both `bootstrap.py` and the bootstrap binary
-parse `config.toml` and read the same command line arguments. `bootstrap.py`
+parse `bootstrap.toml` and read the same command line arguments. `bootstrap.py`
 keeps these in sync by setting various environment variables, and the
 programs sometimes have to add arguments that are explicitly ignored, to be
 read by the other.
diff --git a/src/bootstrap/bootstrap.py b/src/bootstrap/bootstrap.py
index 01a9792f1b3..68400ba0ea0 100644
--- a/src/bootstrap/bootstrap.py
+++ b/src/bootstrap/bootstrap.py
@@ -726,7 +726,7 @@ class RustBuild(object):
 
     def should_fix_bins_and_dylibs(self):
         """Whether or not `fix_bin_or_dylib` needs to be run; can only be True
-        on NixOS or if config.toml has `build.patch-binaries-for-nix` set.
+        on NixOS or if bootstrap.toml has `build.patch-binaries-for-nix` set.
         """
         if self._should_fix_bins_and_dylibs is not None:
             return self._should_fix_bins_and_dylibs
@@ -775,7 +775,7 @@ class RustBuild(object):
                         "The IN_NIX_SHELL environment variable is `{}`;".format(
                             in_nix_shell
                         ),
-                        "you may need to set `patch-binaries-for-nix=true` in config.toml",
+                        "you may need to set `patch-binaries-for-nix=true` in bootstrap.toml",
                     )
 
             return is_nixos
@@ -884,7 +884,7 @@ class RustBuild(object):
         return os.path.join(self.build_dir, self.build, subdir)
 
     def get_toml(self, key, section=None):
-        """Returns the value of the given key in config.toml, otherwise returns None
+        """Returns the value of the given key in bootstrap.toml, otherwise returns None
 
         >>> rb = RustBuild()
         >>> rb.config_toml = 'key1 = "value1"\\nkey2 = "value2"'
@@ -1250,17 +1250,23 @@ def bootstrap(args):
             "unless you put them in place manually."
         )
 
-    # Read from `--config`, then `RUST_BOOTSTRAP_CONFIG`, then `./config.toml`,
-    # then `config.toml` in the root directory.
+    # Read from `--config` first, followed by `RUST_BOOTSTRAP_CONFIG`.
+    # If neither is set, check `./bootstrap.toml`, then `bootstrap.toml` in the root directory.
+    # If those are unavailable, fall back to `./config.toml`, then `config.toml` for
+    # backward compatibility.
     toml_path = args.config or os.getenv("RUST_BOOTSTRAP_CONFIG")
     using_default_path = toml_path is None
     if using_default_path:
-        toml_path = "config.toml"
+        toml_path = "bootstrap.toml"
         if not os.path.exists(toml_path):
-            toml_path = os.path.join(rust_root, toml_path)
+            toml_path = os.path.join(rust_root, "bootstrap.toml")
+            if not os.path.exists(toml_path):
+                toml_path = "config.toml"
+                if not os.path.exists(toml_path):
+                    toml_path = os.path.join(rust_root, "config.toml")
 
     # Give a hard error if `--config` or `RUST_BOOTSTRAP_CONFIG` are set to a missing path,
-    # but not if `config.toml` hasn't been created.
+    # but not if `bootstrap.toml` hasn't been created.
     if not using_default_path or os.path.exists(toml_path):
         with open(toml_path) as config:
             config_toml = config.read()
@@ -1278,7 +1284,9 @@ def bootstrap(args):
         # profiles to be renamed while maintaining back compatibility
         # Keep in sync with `profile_aliases` in config.rs
         profile_aliases = {"user": "dist"}
-        include_file = "config.{}.toml".format(profile_aliases.get(profile) or profile)
+        include_file = "bootstrap.{}.toml".format(
+            profile_aliases.get(profile) or profile
+        )
         include_dir = os.path.join(rust_root, "src", "bootstrap", "defaults")
         include_path = os.path.join(include_dir, include_file)
 
diff --git a/src/bootstrap/bootstrap_test.py b/src/bootstrap/bootstrap_test.py
index 7494536539d..9e12982a43d 100644
--- a/src/bootstrap/bootstrap_test.py
+++ b/src/bootstrap/bootstrap_test.py
@@ -156,7 +156,7 @@ class ParseArgsInConfigure(unittest.TestCase):
 
 
 class GenerateAndParseConfig(unittest.TestCase):
-    """Test that we can serialize and deserialize a config.toml file"""
+    """Test that we can serialize and deserialize a bootstrap.toml file"""
 
     def test_no_args(self):
         build = serialize_and_parse([])
@@ -206,11 +206,11 @@ class BuildBootstrap(unittest.TestCase):
         # problem in most cases, but there is a scenario where it would cause
         # the test to fail.
         #
-        # When a custom local Cargo is configured in config.toml (with the
+        # When a custom local Cargo is configured in bootstrap.toml (with the
         # build.cargo setting), no Cargo is downloaded to any location known by
         # bootstrap, and bootstrap relies on that setting to find it.
         #
-        # In this test though we are not using the config.toml of the caller:
+        # In this test though we are not using the bootstrap.toml of the caller:
         # we are generating a blank one instead. If we don't set build.cargo in
         # it, the test will have no way to find Cargo, failing the test.
         cargo_bin = os.environ.get("BOOTSTRAP_TEST_CARGO_BIN")
diff --git a/src/bootstrap/configure.py b/src/bootstrap/configure.py
index 77151edd240..f6afe096724 100755
--- a/src/bootstrap/configure.py
+++ b/src/bootstrap/configure.py
@@ -367,8 +367,8 @@ if "--help" in sys.argv or "-h" in sys.argv:
             print("\t\t" + option.desc)
     print("")
     print("This configure script is a thin configuration shim over the true")
-    print("configuration system, `config.toml`. You can explore the comments")
-    print("in `config.example.toml` next to this configure script to see")
+    print("configuration system, `bootstrap.toml`. You can explore the comments")
+    print("in `bootstrap.example.toml` next to this configure script to see")
     print("more information about what each option is. Additionally you can")
     print("pass `--set` as an argument to set arbitrary key/value pairs")
     print("in the TOML configuration if desired")
@@ -567,8 +567,8 @@ def apply_args(known_args, option_checking, config):
             raise RuntimeError("unhandled option {}".format(option.name))
 
 
-# "Parse" the `config.example.toml` file into the various sections, and we'll
-# use this as a template of a `config.toml` to write out which preserves
+# "Parse" the `bootstrap.example.toml` file into the various sections, and we'll
+# use this as a template of a `bootstrap.toml` to write out which preserves
 # all the various comments and whatnot.
 #
 # Note that the `target` section is handled separately as we'll duplicate it
@@ -581,7 +581,7 @@ def parse_example_config(known_args, config):
     targets = {}
     top_level_keys = []
 
-    with open(rust_dir + "/config.example.toml") as example_config:
+    with open(rust_dir + "/bootstrap.example.toml") as example_config:
         example_lines = example_config.read().split("\n")
     for line in example_lines:
         if cur_section is None:
@@ -755,8 +755,8 @@ def quit_if_file_exists(file):
 
 
 if __name__ == "__main__":
-    # If 'config.toml' already exists, exit the script at this point
-    quit_if_file_exists("config.toml")
+    # If 'bootstrap.toml' already exists, exit the script at this point
+    quit_if_file_exists("bootstrap.toml")
 
     if "GITHUB_ACTIONS" in os.environ:
         print("::group::Configure the build")
@@ -766,11 +766,11 @@ if __name__ == "__main__":
     p("")
     section_order, sections, targets = parse_args(sys.argv[1:])
 
-    # Now that we've built up our `config.toml`, write it all out in the same
+    # Now that we've built up our `bootstrap.toml`, write it all out in the same
     # order that we read it in.
     p("")
-    p("writing `config.toml` in current directory")
-    with bootstrap.output("config.toml") as f:
+    p("writing `bootstrap.toml` in current directory")
+    with bootstrap.output("bootstrap.toml") as f:
         write_config_toml(f, section_order, targets, sections)
 
     with bootstrap.output("Makefile") as f:
diff --git a/src/bootstrap/defaults/config.compiler.toml b/src/bootstrap/defaults/bootstrap.compiler.toml
similarity index 100%
rename from src/bootstrap/defaults/config.compiler.toml
rename to src/bootstrap/defaults/bootstrap.compiler.toml
diff --git a/src/bootstrap/defaults/config.dist.toml b/src/bootstrap/defaults/bootstrap.dist.toml
similarity index 100%
rename from src/bootstrap/defaults/config.dist.toml
rename to src/bootstrap/defaults/bootstrap.dist.toml
diff --git a/src/bootstrap/defaults/config.library.toml b/src/bootstrap/defaults/bootstrap.library.toml
similarity index 100%
rename from src/bootstrap/defaults/config.library.toml
rename to src/bootstrap/defaults/bootstrap.library.toml
diff --git a/src/bootstrap/defaults/config.tools.toml b/src/bootstrap/defaults/bootstrap.tools.toml
similarity index 100%
rename from src/bootstrap/defaults/config.tools.toml
rename to src/bootstrap/defaults/bootstrap.tools.toml
diff --git a/src/bootstrap/src/bin/main.rs b/src/bootstrap/src/bin/main.rs
index 6f6aaa878ef..88c2d8d9968 100644
--- a/src/bootstrap/src/bin/main.rs
+++ b/src/bootstrap/src/bin/main.rs
@@ -77,14 +77,14 @@ fn main() {
             check_version(&config)
         };
 
-    // NOTE: Since `./configure` generates a `config.toml`, distro maintainers will see the
+    // NOTE: Since `./configure` generates a `bootstrap.toml`, distro maintainers will see the
     // changelog warning, not the `x.py setup` message.
     let suggest_setup = config.config.is_none() && !matches!(config.cmd, Subcommand::Setup { .. });
     if suggest_setup {
-        println!("WARNING: you have not made a `config.toml`");
+        println!("WARNING: you have not made a `bootstrap.toml`");
         println!(
-            "HELP: consider running `./x.py setup` or copying `config.example.toml` by running \
-            `cp config.example.toml config.toml`"
+            "HELP: consider running `./x.py setup` or copying `bootstrap.example.toml` by running \
+            `cp bootstrap.example.toml bootstrap.toml`"
         );
     } else if let Some(suggestion) = &changelog_suggestion {
         println!("{suggestion}");
@@ -98,10 +98,10 @@ fn main() {
     Build::new(config).build();
 
     if suggest_setup {
-        println!("WARNING: you have not made a `config.toml`");
+        println!("WARNING: you have not made a `bootstrap.toml`");
         println!(
-            "HELP: consider running `./x.py setup` or copying `config.example.toml` by running \
-            `cp config.example.toml config.toml`"
+            "HELP: consider running `./x.py setup` or copying `bootstrap.example.toml` by running \
+            `cp bootstrap.example.toml bootstrap.toml`"
         );
     } else if let Some(suggestion) = &changelog_suggestion {
         println!("{suggestion}");
@@ -160,7 +160,7 @@ fn check_version(config: &Config) -> Option<String> {
         }
 
         // Always try to use `change-id` from .last-warned-change-id first. If it doesn't exist,
-        // then use the one from the config.toml. This way we never show the same warnings
+        // then use the one from the bootstrap.toml. This way we never show the same warnings
         // more than once.
         if let Ok(t) = fs::read_to_string(&warned_id_path) {
             let last_warned_id = usize::from_str(&t)
@@ -185,16 +185,18 @@ fn check_version(config: &Config) -> Option<String> {
 
         msg.push_str("NOTE: to silence this warning, ");
         msg.push_str(&format!(
-            "update `config.toml` to use `change-id = {latest_change_id}` instead"
+            "update `bootstrap.toml` to use `change-id = {latest_change_id}` instead"
         ));
 
         if io::stdout().is_terminal() {
             t!(fs::write(warned_id_path, latest_change_id.to_string()));
         }
     } else {
-        msg.push_str("WARNING: The `change-id` is missing in the `config.toml`. This means that you will not be able to track the major changes made to the bootstrap configurations.\n");
+        msg.push_str("WARNING: The `change-id` is missing in the `bootstrap.toml`. This means that you will not be able to track the major changes made to the bootstrap configurations.\n");
         msg.push_str("NOTE: to silence this warning, ");
-        msg.push_str(&format!("add `change-id = {latest_change_id}` at the top of `config.toml`"));
+        msg.push_str(&format!(
+            "add `change-id = {latest_change_id}` at the top of `bootstrap.toml`"
+        ));
     };
 
     Some(msg)
diff --git a/src/bootstrap/src/core/build_steps/compile.rs b/src/bootstrap/src/core/build_steps/compile.rs
index 7c83c53d2c2..846b4de8142 100644
--- a/src/bootstrap/src/core/build_steps/compile.rs
+++ b/src/bootstrap/src/core/build_steps/compile.rs
@@ -425,7 +425,7 @@ fn copy_self_contained_objects(
     } else if target.contains("-wasi") {
         let srcdir = builder.wasi_libdir(target).unwrap_or_else(|| {
             panic!(
-                "Target {:?} does not have a \"wasi-root\" key in Config.toml \
+                "Target {:?} does not have a \"wasi-root\" key in bootstrap.toml \
                     or `$WASI_SDK_PATH` set",
                 target.triple
             )
@@ -1294,7 +1294,7 @@ pub fn rustc_cargo_env(
         .env("CFG_VERSION", builder.rust_version());
 
     // Some tools like Cargo detect their own git information in build scripts. When omit-git-hash
-    // is enabled in config.toml, we pass this environment variable to tell build scripts to avoid
+    // is enabled in bootstrap.toml, we pass this environment variable to tell build scripts to avoid
     // detecting git information on their own.
     if builder.config.omit_git_hash {
         cargo.env("CFG_OMIT_GIT_HASH", "1");
@@ -1538,7 +1538,7 @@ fn is_codegen_cfg_needed(path: &TaskPath, run: &RunConfig<'_>) -> bool {
         {
             run.builder.info(
                 "WARNING: no codegen-backends config matched the requested path to build a codegen backend. \
-                HELP: add backend to codegen-backends in config.toml.",
+                HELP: add backend to codegen-backends in bootstrap.toml.",
             );
             return true;
         }
@@ -1550,7 +1550,7 @@ fn is_codegen_cfg_needed(path: &TaskPath, run: &RunConfig<'_>) -> bool {
 impl Step for CodegenBackend {
     type Output = ();
     const ONLY_HOSTS: bool = true;
-    /// Only the backends specified in the `codegen-backends` entry of `config.toml` are built.
+    /// Only the backends specified in the `codegen-backends` entry of `bootstrap.toml` are built.
     const DEFAULT: bool = true;
 
     fn should_run(run: ShouldRun<'_>) -> ShouldRun<'_> {
diff --git a/src/bootstrap/src/core/build_steps/dist.rs b/src/bootstrap/src/core/build_steps/dist.rs
index ffb60bd5634..0515a4cc00e 100644
--- a/src/bootstrap/src/core/build_steps/dist.rs
+++ b/src/bootstrap/src/core/build_steps/dist.rs
@@ -1000,9 +1000,9 @@ impl Step for PlainSourceTarball {
         let src_files = [
             // tidy-alphabetical-start
             ".gitmodules",
+            "bootstrap.example.toml",
             "Cargo.lock",
             "Cargo.toml",
-            "config.example.toml",
             "configure",
             "CONTRIBUTING.md",
             "COPYRIGHT",
diff --git a/src/bootstrap/src/core/build_steps/doc.rs b/src/bootstrap/src/core/build_steps/doc.rs
index 8e913f68184..a8da4146100 100644
--- a/src/bootstrap/src/core/build_steps/doc.rs
+++ b/src/bootstrap/src/core/build_steps/doc.rs
@@ -1218,7 +1218,7 @@ impl Step for RustcBook {
         cmd.env("RUSTC_BOOTSTRAP", "1");
 
         // If the lib directories are in an unusual location (changed in
-        // config.toml), then this needs to explicitly update the dylib search
+        // bootstrap.toml), then this needs to explicitly update the dylib search
         // path.
         builder.add_rustc_lib_path(self.compiler, &mut cmd);
         let doc_generator_guard = builder.msg(
diff --git a/src/bootstrap/src/core/build_steps/install.rs b/src/bootstrap/src/core/build_steps/install.rs
index 4f96d67a5bd..3e5069225d2 100644
--- a/src/bootstrap/src/core/build_steps/install.rs
+++ b/src/bootstrap/src/core/build_steps/install.rs
@@ -85,11 +85,11 @@ fn install_sh(
     } else {
         assert!(
             is_dir_writable_for_user(&prefix),
-            "User doesn't have write access on `install.prefix` path in the `config.toml`.",
+            "User doesn't have write access on `install.prefix` path in the `bootstrap.toml`.",
         );
         assert!(
             is_dir_writable_for_user(&sysconfdir),
-            "User doesn't have write access on `install.sysconfdir` path in `config.toml`."
+            "User doesn't have write access on `install.sysconfdir` path in `bootstrap.toml`."
         );
     }
 
diff --git a/src/bootstrap/src/core/build_steps/llvm.rs b/src/bootstrap/src/core/build_steps/llvm.rs
index 3b6b7cb2055..1e3148d631c 100644
--- a/src/bootstrap/src/core/build_steps/llvm.rs
+++ b/src/bootstrap/src/core/build_steps/llvm.rs
@@ -350,7 +350,7 @@ impl Step for Llvm {
             (true, true) => "RelWithDebInfo",
         };
 
-        // NOTE: remember to also update `config.example.toml` when changing the
+        // NOTE: remember to also update `bootstrap.example.toml` when changing the
         // defaults!
         let llvm_targets = match &builder.config.llvm_targets {
             Some(s) => s,
diff --git a/src/bootstrap/src/core/build_steps/perf.rs b/src/bootstrap/src/core/build_steps/perf.rs
index 6962001fdc2..7f4e88bd73c 100644
--- a/src/bootstrap/src/core/build_steps/perf.rs
+++ b/src/bootstrap/src/core/build_steps/perf.rs
@@ -147,7 +147,7 @@ pub fn perf(builder: &Builder<'_>, args: &PerfArgs) {
     };
     if is_profiling && builder.build.config.rust_debuginfo_level_rustc == DebuginfoLevel::None {
         builder.info(r#"WARNING: You are compiling rustc without debuginfo, this will make profiling less useful.
-Consider setting `rust.debuginfo-level = 1` in `config.toml`."#);
+Consider setting `rust.debuginfo-level = 1` in `bootstrap.toml`."#);
     }
 
     let compiler = builder.compiler(builder.top_stage, builder.config.build);
diff --git a/src/bootstrap/src/core/build_steps/run.rs b/src/bootstrap/src/core/build_steps/run.rs
index 1ef86e674f0..5cacd5b9914 100644
--- a/src/bootstrap/src/core/build_steps/run.rs
+++ b/src/bootstrap/src/core/build_steps/run.rs
@@ -35,10 +35,10 @@ impl Step for BuildManifest {
         // (https://github.com/rust-lang/promote-release).
         let mut cmd = builder.tool_cmd(Tool::BuildManifest);
         let sign = builder.config.dist_sign_folder.as_ref().unwrap_or_else(|| {
-            panic!("\n\nfailed to specify `dist.sign-folder` in `config.toml`\n\n")
+            panic!("\n\nfailed to specify `dist.sign-folder` in `bootstrap.toml`\n\n")
         });
         let addr = builder.config.dist_upload_addr.as_ref().unwrap_or_else(|| {
-            panic!("\n\nfailed to specify `dist.upload-addr` in `config.toml`\n\n")
+            panic!("\n\nfailed to specify `dist.upload-addr` in `bootstrap.toml`\n\n")
         });
 
         let today = command("date").arg("+%Y-%m-%d").run_capture_stdout(builder).stdout();
diff --git a/src/bootstrap/src/core/build_steps/setup.rs b/src/bootstrap/src/core/build_steps/setup.rs
index 45f9f52cb82..636d51e0e90 100644
--- a/src/bootstrap/src/core/build_steps/setup.rs
+++ b/src/bootstrap/src/core/build_steps/setup.rs
@@ -2,8 +2,8 @@
 //!
 //! These are build-and-run steps for `./x.py setup`, which allows quickly setting up the directory
 //! for modifying, building, and running the compiler and library. Running arbitrary configuration
-//! allows setting up things that cannot be simply captured inside the config.toml, in addition to
-//! leading people away from manually editing most of the config.toml values.
+//! allows setting up things that cannot be simply captured inside the bootstrap.toml, in addition to
+//! leading people away from manually editing most of the bootstrap.toml values.
 
 use std::env::consts::EXE_SUFFIX;
 use std::fmt::Write as _;
@@ -37,7 +37,7 @@ static PROFILE_DIR: &str = "src/bootstrap/defaults";
 
 impl Profile {
     fn include_path(&self, src_path: &Path) -> PathBuf {
-        PathBuf::from(format!("{}/{PROFILE_DIR}/config.{}.toml", src_path.display(), self))
+        PathBuf::from(format!("{}/{PROFILE_DIR}/bootstrap.{}.toml", src_path.display(), self))
     }
 
     pub fn all() -> impl Iterator<Item = Self> {
@@ -53,7 +53,7 @@ impl Profile {
             Compiler => "Contribute to the compiler itself",
             Tools => "Contribute to tools which depend on the compiler, but do not modify it directly (e.g. rustdoc, clippy, miri)",
             Dist => "Install Rust from source",
-            None => "Do not modify `config.toml`"
+            None => "Do not modify `bootstrap.toml`"
         }
         .to_string()
     }
@@ -117,7 +117,7 @@ impl Step for Profile {
             return;
         }
 
-        let path = &run.builder.config.config.clone().unwrap_or(PathBuf::from("config.toml"));
+        let path = &run.builder.config.config.clone().unwrap_or(PathBuf::from("bootstrap.toml"));
         if path.exists() {
             eprintln!();
             eprintln!(
@@ -203,7 +203,7 @@ pub fn setup(config: &Config, profile: Profile) {
         )
     }
 
-    let path = &config.config.clone().unwrap_or(PathBuf::from("config.toml"));
+    let path = &config.config.clone().unwrap_or(PathBuf::from("bootstrap.toml"));
     setup_config_toml(path, profile, config);
 }
 
diff --git a/src/bootstrap/src/core/build_steps/test.rs b/src/bootstrap/src/core/build_steps/test.rs
index cff286e99fa..81f6b473c45 100644
--- a/src/bootstrap/src/core/build_steps/test.rs
+++ b/src/bootstrap/src/core/build_steps/test.rs
@@ -1119,7 +1119,7 @@ impl Step for Tidy {
                         "\
 ERROR: no `rustfmt` binary found in {PATH}
 INFO: `rust.channel` is currently set to \"{CHAN}\"
-HELP: if you are testing a beta branch, set `rust.channel` to \"beta\" in the `config.toml` file
+HELP: if you are testing a beta branch, set `rust.channel` to \"beta\" in the `bootstrap.toml` file
 HELP: to skip test's attempt to check tidiness, pass `--skip src/tools/tidy` to `x.py test`",
                         PATH = inferred_rustfmt_dir.display(),
                         CHAN = builder.config.channel,
diff --git a/src/bootstrap/src/core/build_steps/toolstate.rs b/src/bootstrap/src/core/build_steps/toolstate.rs
index a65623de95a..fc7acd1fa14 100644
--- a/src/bootstrap/src/core/build_steps/toolstate.rs
+++ b/src/bootstrap/src/core/build_steps/toolstate.rs
@@ -128,7 +128,7 @@ impl Step for ToolStateCheck {
     /// Checks tool state status.
     ///
     /// This is intended to be used in the `checktools.sh` script. To use
-    /// this, set `save-toolstates` in `config.toml` so that tool status will
+    /// this, set `save-toolstates` in `bootstrap.toml` so that tool status will
     /// be saved to a JSON file. Then, run `x.py test --no-fail-fast` for all
     /// of the tools to populate the JSON file. After that is done, this
     /// command can be run to check for any status failures, and exits with an
@@ -254,7 +254,7 @@ impl Builder<'_> {
     /// Updates the actual toolstate of a tool.
     ///
     /// The toolstates are saved to the file specified by the key
-    /// `rust.save-toolstates` in `config.toml`. If unspecified, nothing will be
+    /// `rust.save-toolstates` in `bootstrap.toml`. If unspecified, nothing will be
     /// done. The file is updated immediately after this function completes.
     pub fn save_toolstate(&self, tool: &str, state: ToolState) {
         use std::io::Write;
diff --git a/src/bootstrap/src/core/builder/cargo.rs b/src/bootstrap/src/core/builder/cargo.rs
index 62d23c4ae6b..efb1b8b25b7 100644
--- a/src/bootstrap/src/core/builder/cargo.rs
+++ b/src/bootstrap/src/core/builder/cargo.rs
@@ -215,7 +215,7 @@ impl Cargo {
         // dynamic libraries. We use this by default on Unix platforms to ensure
         // that our nightlies behave the same on Windows, that is they work out
         // of the box. This can be disabled by setting `rpath = false` in `[rust]`
-        // table of `config.toml`
+        // table of `bootstrap.toml`
         //
         // Ok, so the astute might be wondering "why isn't `-C rpath` used
         // here?" and that is indeed a good question to ask. This codegen
diff --git a/src/bootstrap/src/core/builder/mod.rs b/src/bootstrap/src/core/builder/mod.rs
index 0b6b8513cc3..a9058f888d3 100644
--- a/src/bootstrap/src/core/builder/mod.rs
+++ b/src/bootstrap/src/core/builder/mod.rs
@@ -31,9 +31,9 @@ mod cargo;
 mod tests;
 
 /// Builds and performs different [`Self::kind`]s of stuff and actions, taking
-/// into account build configuration from e.g. config.toml.
+/// into account build configuration from e.g. bootstrap.toml.
 pub struct Builder<'a> {
-    /// Build configuration from e.g. config.toml.
+    /// Build configuration from e.g. bootstrap.toml.
     pub build: &'a Build,
 
     /// The stage to use. Either implicitly determined based on subcommand, or
@@ -332,7 +332,7 @@ impl PathSet {
 }
 
 const PATH_REMAP: &[(&str, &[&str])] = &[
-    // config.toml uses `rust-analyzer-proc-macro-srv`, but the
+    // bootstrap.toml uses `rust-analyzer-proc-macro-srv`, but the
     // actual path is `proc-macro-srv-cli`
     ("rust-analyzer-proc-macro-srv", &["src/tools/rust-analyzer/crates/proc-macro-srv-cli"]),
     // Make `x test tests` function the same as `x t tests/*`
diff --git a/src/bootstrap/src/core/config/config.rs b/src/bootstrap/src/core/config/config.rs
index 18624a7c78f..f8ed8072c3d 100644
--- a/src/bootstrap/src/core/config/config.rs
+++ b/src/bootstrap/src/core/config/config.rs
@@ -1,6 +1,6 @@
 //! Serialized configuration of a build.
 //!
-//! This module implements parsing `config.toml` configuration files to tweak
+//! This module implements parsing `bootstrap.toml` configuration files to tweak
 //! how the build runs.
 
 use std::cell::{Cell, RefCell};
@@ -64,7 +64,7 @@ macro_rules! check_ci_llvm {
 /// useful in scenarios where developers want to see how the tarball sources were
 /// generated.
 ///
-/// We also use this file to compare the host's config.toml against the CI rustc builder
+/// We also use this file to compare the host's bootstrap.toml against the CI rustc builder
 /// configuration to detect any incompatible options.
 pub(crate) const BUILDER_CONFIG_FILENAME: &str = "builder-config";
 
@@ -184,12 +184,12 @@ pub enum GccCiMode {
 
 /// Global configuration for the entire build and/or bootstrap.
 ///
-/// This structure is parsed from `config.toml`, and some of the fields are inferred from `git` or build-time parameters.
+/// This structure is parsed from `bootstrap.toml`, and some of the fields are inferred from `git` or build-time parameters.
 ///
 /// Note that this structure is not decoded directly into, but rather it is
 /// filled out from the decoded forms of the structs below. For documentation
 /// each field, see the corresponding fields in
-/// `config.example.toml`.
+/// `bootstrap.example.toml`.
 #[derive(Default, Clone)]
 pub struct Config {
     pub change_id: Option<usize>,
@@ -235,7 +235,7 @@ pub struct Config {
     pub keep_stage: Vec<u32>,
     pub keep_stage_std: Vec<u32>,
     pub src: PathBuf,
-    /// defaults to `config.toml`
+    /// defaults to `bootstrap.toml`
     pub config: Option<PathBuf>,
     pub jobs: Option<u32>,
     pub cmd: Subcommand,
@@ -470,7 +470,7 @@ impl std::str::FromStr for SplitDebuginfo {
 
 impl SplitDebuginfo {
     /// Returns the default `-Csplit-debuginfo` value for the current target. See the comment for
-    /// `rust.split-debuginfo` in `config.example.toml`.
+    /// `rust.split-debuginfo` in `bootstrap.example.toml`.
     fn default_for_platform(target: TargetSelection) -> Self {
         if target.contains("apple") {
             SplitDebuginfo::Unpacked
@@ -677,7 +677,7 @@ impl Target {
         target
     }
 }
-/// Structure of the `config.toml` file that configuration is read from.
+/// Structure of the `bootstrap.toml` file that configuration is read from.
 ///
 /// This structure uses `Decodable` to automatically decode a TOML configuration
 /// file into this format, and then this is traversed and written into the above
@@ -1485,26 +1485,35 @@ impl Config {
 
         config.stage0_metadata = build_helper::stage0_parser::parse_stage0_file();
 
-        // Find configuration file, with the following cascading fallback (first match wins):
-        // - `--config <path>`
-        // - `RUST_BOOTSTRAP_CONFIG`
-        // - `./config.toml`
-        // - `config.toml` in the root directory.
+        // Locate the configuration file using the following priority (first match wins):
+        // 1. `--config <path>` (explicit flag)
+        // 2. `RUST_BOOTSTRAP_CONFIG` environment variable
+        // 3. `./bootstrap.toml` (local file)
+        // 4. `<root>/bootstrap.toml`
+        // 5. `./config.toml` (fallback for backward compatibility)
+        // 6. `<root>/config.toml`
         let toml_path = flags
             .config
             .clone()
             .or_else(|| env::var_os("RUST_BOOTSTRAP_CONFIG").map(PathBuf::from));
         let using_default_path = toml_path.is_none();
-        let mut toml_path = toml_path.unwrap_or_else(|| PathBuf::from("config.toml"));
+        let mut toml_path = toml_path.unwrap_or_else(|| PathBuf::from("bootstrap.toml"));
+
         if using_default_path && !toml_path.exists() {
-            toml_path = config.src.join(toml_path);
+            toml_path = config.src.join(PathBuf::from("bootstrap.toml"));
+            if !toml_path.exists() {
+                toml_path = PathBuf::from("config.toml");
+                if !toml_path.exists() {
+                    toml_path = config.src.join(PathBuf::from("config.toml"));
+                }
+            }
         }
 
         let file_content = t!(fs::read_to_string(config.src.join("src/ci/channel")));
         let ci_channel = file_content.trim_end();
 
         // Give a hard error if `--config` or `RUST_BOOTSTRAP_CONFIG` are set to a missing path,
-        // but not if `config.toml` hasn't been created.
+        // but not if `bootstrap.toml` hasn't been created.
         let mut toml = if !using_default_path || toml_path.exists() {
             config.config = Some(if cfg!(not(test)) {
                 toml_path.canonicalize().unwrap()
@@ -1525,7 +1534,7 @@ impl Config {
             // same ones used to call the tests (if custom ones are not defined in the toml). If we
             // don't do that, bootstrap will use its own detection logic to find a suitable rustc
             // and Cargo, which doesn't work when the caller is specìfying a custom local rustc or
-            // Cargo in their config.toml.
+            // Cargo in their bootstrap.toml.
             let build = toml.build.get_or_insert_with(Default::default);
             build.rustc = build.rustc.take().or(std::env::var_os("RUSTC").map(|p| p.into()));
             build.cargo = build.cargo.take().or(std::env::var_os("CARGO").map(|p| p.into()));
@@ -1548,7 +1557,7 @@ impl Config {
             include_path.push("src");
             include_path.push("bootstrap");
             include_path.push("defaults");
-            include_path.push(format!("config.{include}.toml"));
+            include_path.push(format!("bootstrap.{include}.toml"));
             let included_toml = get_toml(&include_path).unwrap_or_else(|e| {
                 eprintln!(
                     "ERROR: Failed to parse default config profile at '{}': {e}",
@@ -2030,7 +2039,7 @@ impl Config {
         config.description = description;
 
         // We need to override `rust.channel` if it's manually specified when using the CI rustc.
-        // This is because if the compiler uses a different channel than the one specified in config.toml,
+        // This is because if the compiler uses a different channel than the one specified in bootstrap.toml,
         // tests may fail due to using a different channel than the one used by the compiler during tests.
         if let Some(commit) = &config.download_rustc_commit {
             if is_user_configured_rust_channel {
@@ -2655,7 +2664,7 @@ impl Config {
                                 return None;
                             },
                             Err(e) => {
-                                eprintln!("ERROR: Failed to parse CI rustc config.toml: {e}");
+                                eprintln!("ERROR: Failed to parse CI rustc bootstrap.toml: {e}");
                                 exit!(2);
                             },
                         };
@@ -2818,7 +2827,7 @@ impl Config {
     ///
     /// `relative_path` should be relative to the root of the git repository, not an absolute path.
     ///
-    /// This *does not* update the submodule if `config.toml` explicitly says
+    /// This *does not* update the submodule if `bootstrap.toml` explicitly says
     /// not to, or if we're not in a git repository (like a plain source
     /// tarball). Typically [`crate::Build::require_submodule`] should be
     /// used instead to provide a nice error to the user if the submodule is
@@ -3042,7 +3051,9 @@ impl Config {
                     }
                     println!("ERROR: could not find commit hash for downloading rustc");
                     println!("HELP: maybe your repository history is too shallow?");
-                    println!("HELP: consider setting `rust.download-rustc=false` in config.toml");
+                    println!(
+                        "HELP: consider setting `rust.download-rustc=false` in bootstrap.toml"
+                    );
                     println!("HELP: or fetch enough history to include one upstream commit");
                     crate::exit!(1);
                 }
diff --git a/src/bootstrap/src/core/config/flags.rs b/src/bootstrap/src/core/config/flags.rs
index 3bb62bbe380..0f8efcfcc76 100644
--- a/src/bootstrap/src/core/config/flags.rs
+++ b/src/bootstrap/src/core/config/flags.rs
@@ -54,7 +54,7 @@ pub struct Flags {
     /// TOML configuration file for build
     pub config: Option<PathBuf>,
     #[arg(global = true, long, value_hint = clap::ValueHint::DirPath, value_name = "DIR")]
-    /// Build directory, overrides `build.build-dir` in `config.toml`
+    /// Build directory, overrides `build.build-dir` in `bootstrap.toml`
     pub build_dir: Option<PathBuf>,
 
     #[arg(global = true, long, value_hint = clap::ValueHint::Other, value_name = "BUILD")]
@@ -173,7 +173,7 @@ pub struct Flags {
     #[arg(global = true)]
     /// paths for the subcommand
     pub paths: Vec<PathBuf>,
-    /// override options in config.toml
+    /// override options in bootstrap.toml
     #[arg(global = true, value_hint = clap::ValueHint::Other, long, value_name = "section.option=value")]
     pub set: Vec<String>,
     /// arguments passed to subcommands
@@ -448,7 +448,7 @@ pub enum Subcommand {
     /// Set up the environment for development
     #[command(long_about = format!(
         "\n
-x.py setup creates a `config.toml` which changes the defaults for x.py itself,
+x.py setup creates a `bootstrap.toml` which changes the defaults for x.py itself,
 as well as setting up a git pre-push hook, VS Code config and toolchain link.
 Arguments:
     This subcommand accepts a 'profile' to use for builds. For example:
@@ -461,7 +461,7 @@ Arguments:
         ./x.py setup editor
         ./x.py setup link", Profile::all_for_help("        ").trim_end()))]
     Setup {
-        /// Either the profile for `config.toml` or another setup action.
+        /// Either the profile for `bootstrap.toml` or another setup action.
         /// May be omitted to set up interactively
         #[arg(value_name = "<PROFILE>|hook|editor|link")]
         profile: Option<PathBuf>,
diff --git a/src/bootstrap/src/core/config/tests.rs b/src/bootstrap/src/core/config/tests.rs
index c7b6f3681b8..c5c77d19f07 100644
--- a/src/bootstrap/src/core/config/tests.rs
+++ b/src/bootstrap/src/core/config/tests.rs
@@ -69,7 +69,7 @@ fn detect_src_and_out() {
         let expected_src = manifest_dir.ancestors().nth(2).unwrap();
         assert_eq!(&cfg.src, expected_src);
 
-        // test if build-dir was manually given in config.toml
+        // test if build-dir was manually given in bootstrap.toml
         if let Some(custom_build_dir) = build_dir {
             assert_eq!(&cfg.out, Path::new(custom_build_dir));
         }
@@ -230,7 +230,7 @@ fn override_toml_duplicate() {
 fn profile_user_dist() {
     fn get_toml(file: &Path) -> Result<TomlConfig, toml::de::Error> {
         let contents =
-            if file.ends_with("config.toml") || env::var_os("RUST_BOOTSTRAP_CONFIG").is_some() {
+            if file.ends_with("bootstrap.toml") || env::var_os("RUST_BOOTSTRAP_CONFIG").is_some() {
                 "profile = \"user\"".to_owned()
             } else {
                 assert!(file.ends_with("config.dist.toml"));
@@ -402,7 +402,7 @@ fn jobs_precedence() {
     );
     assert_eq!(config.jobs, Some(67890));
 
-    // `--set build.jobs` should take precedence over `config.toml`.
+    // `--set build.jobs` should take precedence over `bootstrap.toml`.
     let config = Config::parse_inner(
         Flags::parse(&[
             "check".to_owned(),
@@ -420,7 +420,7 @@ fn jobs_precedence() {
     );
     assert_eq!(config.jobs, Some(12345));
 
-    // `--jobs` > `--set build.jobs` > `config.toml`
+    // `--jobs` > `--set build.jobs` > `bootstrap.toml`
     let config = Config::parse_inner(
         Flags::parse(&[
             "check".to_owned(),
diff --git a/src/bootstrap/src/core/download.rs b/src/bootstrap/src/core/download.rs
index 98eff664a5b..b99d2e4631a 100644
--- a/src/bootstrap/src/core/download.rs
+++ b/src/bootstrap/src/core/download.rs
@@ -124,7 +124,7 @@ impl Config {
                 if let Ok(in_nix_shell) = in_nix_shell {
                     eprintln!(
                         "The IN_NIX_SHELL environment variable is `{in_nix_shell}`; \
-                         you may need to set `patch-binaries-for-nix=true` in config.toml"
+                         you may need to set `patch-binaries-for-nix=true` in bootstrap.toml"
                     );
                 }
             }
@@ -699,7 +699,7 @@ impl Config {
             help_on_error = "ERROR: failed to download pre-built rustc from CI
 
 NOTE: old builds get deleted after a certain time
-HELP: if trying to compile an old commit of rustc, disable `download-rustc` in config.toml:
+HELP: if trying to compile an old commit of rustc, disable `download-rustc` in bootstrap.toml:
 
 [rust]
 download-rustc = false
@@ -783,7 +783,7 @@ download-rustc = false
                     println!("HELP: Consider rebasing to a newer commit if available.");
                 }
                 Err(e) => {
-                    eprintln!("ERROR: Failed to parse CI LLVM config.toml: {e}");
+                    eprintln!("ERROR: Failed to parse CI LLVM bootstrap.toml: {e}");
                     exit!(2);
                 }
             };
@@ -816,7 +816,7 @@ download-rustc = false
     HELP: There could be two reasons behind this:
         1) The host triple is not supported for `download-ci-llvm`.
         2) Old builds get deleted after a certain time.
-    HELP: In either case, disable `download-ci-llvm` in your config.toml:
+    HELP: In either case, disable `download-ci-llvm` in your bootstrap.toml:
 
     [llvm]
     download-ci-llvm = false
diff --git a/src/bootstrap/src/core/sanity.rs b/src/bootstrap/src/core/sanity.rs
index 583b8e1198a..dbfebd11f82 100644
--- a/src/bootstrap/src/core/sanity.rs
+++ b/src/bootstrap/src/core/sanity.rs
@@ -153,7 +153,7 @@ pub fn check(build: &mut Build) {
 Couldn't find required command: cmake
 
 You should install cmake, or set `download-ci-llvm = true` in the
-`[llvm]` section of `config.toml` to download LLVM rather
+`[llvm]` section of `bootstrap.toml` to download LLVM rather
 than building it.
 "
         );
@@ -339,7 +339,7 @@ than building it.
                 None => panic!(
                     "when targeting MUSL either the rust.musl-root \
                             option or the target.$TARGET.musl-root option must \
-                            be specified in config.toml"
+                            be specified in bootstrap.toml"
                 ),
             }
         }
diff --git a/src/bootstrap/src/lib.rs b/src/bootstrap/src/lib.rs
index 91574f8bf5d..1fba17dcf30 100644
--- a/src/bootstrap/src/lib.rs
+++ b/src/bootstrap/src/lib.rs
@@ -143,7 +143,7 @@ pub enum GitRepo {
 /// organize).
 #[derive(Clone)]
 pub struct Build {
-    /// User-specified configuration from `config.toml`.
+    /// User-specified configuration from `bootstrap.toml`.
     config: Config,
 
     // Version information
@@ -538,7 +538,7 @@ impl Build {
     /// This avoids contributors checking in a submodule change by accident.
     fn update_existing_submodules(&self) {
         // Avoid running git when there isn't a git checkout, or the user has
-        // explicitly disabled submodules in `config.toml`.
+        // explicitly disabled submodules in `bootstrap.toml`.
         if !self.config.submodules() {
             return;
         }
@@ -671,7 +671,7 @@ impl Build {
     }
 
     /// Gets the space-separated set of activated features for the standard library.
-    /// This can be configured with the `std-features` key in config.toml.
+    /// This can be configured with the `std-features` key in bootstrap.toml.
     fn std_features(&self, target: TargetSelection) -> String {
         let mut features: BTreeSet<&str> =
             self.config.rust_std_features.iter().map(|s| s.as_str()).collect();
@@ -1925,7 +1925,7 @@ Couldn't find required command: ninja (or ninja-build)
 
 You should install ninja as described at
 <https://github.com/ninja-build/ninja/wiki/Pre-built-Ninja-packages>,
-or set `ninja = false` in the `[llvm]` section of `config.toml`.
+or set `ninja = false` in the `[llvm]` section of `bootstrap.toml`.
 Alternatively, set `download-ci-llvm = true` in that `[llvm]` section
 to download LLVM rather than building it.
 "
diff --git a/src/bootstrap/src/utils/cc_detect.rs b/src/bootstrap/src/utils/cc_detect.rs
index 1e84a7deff1..355a4899100 100644
--- a/src/bootstrap/src/utils/cc_detect.rs
+++ b/src/bootstrap/src/utils/cc_detect.rs
@@ -4,8 +4,8 @@
 //! C and C++ compilers for each target configured. A compiler is found through
 //! a number of vectors (in order of precedence)
 //!
-//! 1. Configuration via `target.$target.cc` in `config.toml`.
-//! 2. Configuration via `target.$target.android-ndk` in `config.toml`, if
+//! 1. Configuration via `target.$target.cc` in `bootstrap.toml`.
+//! 2. Configuration via `target.$target.android-ndk` in `bootstrap.toml`, if
 //!    applicable
 //! 3. Special logic to probe on OpenBSD
 //! 4. The `CC_$target` environment variable.
@@ -195,7 +195,7 @@ fn default_compiler(
 ) -> Option<PathBuf> {
     match &*target.triple {
         // When compiling for android we may have the NDK configured in the
-        // config.toml in which case we look there. Otherwise the default
+        // bootstrap.toml in which case we look there. Otherwise the default
         // compiler already takes into account the triple in question.
         t if t.contains("android") => {
             build.config.android_ndk.as_ref().map(|ndk| ndk_compiler(compiler, &target.triple, ndk))
diff --git a/src/bootstrap/src/utils/change_tracker.rs b/src/bootstrap/src/utils/change_tracker.rs
index f8478725c4c..e585767ac77 100644
--- a/src/bootstrap/src/utils/change_tracker.rs
+++ b/src/bootstrap/src/utils/change_tracker.rs
@@ -385,4 +385,9 @@ pub const CONFIG_CHANGE_HISTORY: &[ChangeInfo] = &[
         severity: ChangeSeverity::Info,
         summary: "New option `build.exclude` that adds support for excluding test.",
     },
+    ChangeInfo {
+        change_id: 137081,
+        severity: ChangeSeverity::Info,
+        summary: "The default configuration filename has changed from `config.toml` to `bootstrap.toml`. `config.toml` is deprecated but remains supported for backward compatibility.",
+    },
 ];
diff --git a/triagebot.toml b/triagebot.toml
index 293ad259910..626ae64ee4e 100644
--- a/triagebot.toml
+++ b/triagebot.toml
@@ -421,7 +421,7 @@ trigger_files = [
 trigger_files = [
     "Cargo.toml",
     "configure",
-    "config.example.toml",
+    "bootstrap.example.toml",
     "src/bootstrap",
     "src/build_helper",
     "src/tools/rust-installer",