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feat: impl export-executable-symbols

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This commit is contained in:
csmoe 2022-07-25 05:20:23 +00:00
parent babff2211e
commit 6674c94d15
7 changed files with 42 additions and 5 deletions
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7
compiler/rustc_codegen_ssa/src/back/link.rs
View file

@ -2082,7 +2082,12 @@ fn add_order_independent_options(
// sections to ensure we have all the data for PGO.
let keep_metadata =
crate_type == CrateType::Dylib || sess.opts.cg.profile_generate.enabled();
cmd.gc_sections(keep_metadata);
if crate_type != CrateType::Executable || !sess.opts.unstable_opts.export_executable_symbols
{
cmd.gc_sections(keep_metadata);
} else {
cmd.no_gc_sections();
}
}
cmd.set_output_kind(link_output_kind, out_filename);

17
compiler/rustc_codegen_ssa/src/back/linker.rs
View file

@ -640,9 +640,14 @@ impl<'a> Linker for GccLinker<'a> {
fn export_symbols(&mut self, tmpdir: &Path, crate_type: CrateType, symbols: &[String]) {
// Symbol visibility in object files typically takes care of this.
if crate_type == CrateType::Executable && self.sess.target.override_export_symbols.is_none()
{
return;
if crate_type == CrateType::Executable {
let should_export_executable_symbols =
self.sess.opts.unstable_opts.export_executable_symbols;
if self.sess.target.override_export_symbols.is_none()
&& !should_export_executable_symbols
{
return;
}
}
// We manually create a list of exported symbols to ensure we don't expose any more.
@ -969,7 +974,11 @@ impl<'a> Linker for MsvcLinker<'a> {
fn export_symbols(&mut self, tmpdir: &Path, crate_type: CrateType, symbols: &[String]) {
// Symbol visibility takes care of this typically
if crate_type == CrateType::Executable {
return;
let should_export_executable_symbols =
self.sess.opts.unstable_opts.export_executable_symbols;
if !should_export_executable_symbols {
return;
}
}
let path = tmpdir.join("lib.def");

1
compiler/rustc_interface/src/tests.rs
View file

@ -733,6 +733,7 @@ fn test_unstable_options_tracking_hash() {
tracked!(debug_macros, true);
tracked!(dep_info_omit_d_target, true);
tracked!(drop_tracking, true);
tracked!(export_executable_symbols, true);
tracked!(dual_proc_macros, true);
tracked!(dwarf_version, Some(5));
tracked!(emit_thin_lto, false);

2
compiler/rustc_session/src/options.rs
View file

@ -1282,6 +1282,8 @@ options! {
"emit a section containing stack size metadata (default: no)"),
emit_thin_lto: bool = (true, parse_bool, [TRACKED],
"emit the bc module with thin LTO info (default: yes)"),
export_executable_symbols: bool = (false, parse_bool, [TRACKED],
"export symbols from executables, as if they were dynamic libraries"),
fewer_names: Option<bool> = (None, parse_opt_bool, [TRACKED],
"reduce memory use by retaining fewer names within compilation artifacts (LLVM-IR) \
(default: no)"),