bjoernager/rust
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Rollup merge of #92933 - bjorn3:no_bin_lib_mixing, r=estebank

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Deny mixing bin crate type with lib crate types

The produced library would get a main shim too which conflicts with the
main shim of the executable linking the library.

```
$ cat > main1.rs <<EOF
fn main() {}
pub fn bar() {}
EOF
$ cat > main2.rs <<EOF
extern crate main1;
fn main() {
    main1::bar();
}
EOF
$ rustc --crate-type bin --crate-type lib main1.rs
$ rustc -L. main2.rs
error: linking with `cc` failed: exit status: 1
[...]
  = note: /usr/bin/ld: /tmp/crate_bin_lib/libmain1.rlib(main1.main1.707747aa-cgu.0.rcgu.o): in function `main':
          main1.707747aa-cgu.0:(.text.main+0x0): multiple definition of `main'; main2.main2.02a148fe-cgu.0.rcgu.o:main2.02a148fe-cgu.0:(.text.main+0x0): first defined here
          collect2: error: ld returned 1 exit status
```
This commit is contained in:
Matthias Krüger 2022-02-18 16:23:28 +01:00 • committed by GitHub
commit e3ded4fc4f
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6 changed files with 12 additions and 21 deletions
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12
compiler/rustc_interface/src/passes.rs
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@ -393,8 +393,18 @@ pub fn configure_and_expand(
});
let crate_types = sess.crate_types();
let is_executable_crate = crate_types.contains(&CrateType::Executable);
let is_proc_macro_crate = crate_types.contains(&CrateType::ProcMacro);
if crate_types.len() > 1 {
if is_executable_crate {
sess.err("cannot mix `bin` crate type with others");
}
if is_proc_macro_crate {
sess.err("cannot mix `proc-macro` crate type with others");
}
}
// For backwards compatibility, we don't try to run proc macro injection
// if rustdoc is run on a proc macro crate without '--crate-type proc-macro' being
// specified. This should only affect users who manually invoke 'rustdoc', as
@ -411,7 +421,6 @@ pub fn configure_and_expand(
msg.emit()
} else {
krate = sess.time("maybe_create_a_macro_crate", || {
let num_crate_types = crate_types.len();
let is_test_crate = sess.opts.test;
rustc_builtin_macros::proc_macro_harness::inject(
sess,
@ -420,7 +429,6 @@ pub fn configure_and_expand(
is_proc_macro_crate,
has_proc_macro_decls,
is_test_crate,
num_crate_types,
sess.diagnostic(),
)
});