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Add -Z external-clangrt #121207

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merged 3 commits into from
Mar 15, 2024
Merged

Add -Z external-clangrt #121207

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2a9d1ed
Add `-Z external-sanitizer-runtime`
chriswailes Oct 17, 2023
bf2858a
Split a complex conditional into separate statements
chriswailes Mar 13, 2024
f46acea
Restore correct version of comment and fix logic bug
chriswailes Mar 14, 2024
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29 changes: 19 additions & 10 deletions compiler/rustc_codegen_ssa/src/back/link.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1201,20 +1201,29 @@ fn add_sanitizer_libraries(
crate_type: CrateType,
linker: &mut dyn Linker,
) {
if sess.target.is_like_android {
// Sanitizer runtime libraries are provided dynamically on Android
// targets.
return;
}

if sess.opts.unstable_opts.external_clangrt {
// Linking against in-tree sanitizer runtimes is disabled via
// `-Z external-clangrt`
return;
}

if matches!(crate_type, CrateType::Rlib | CrateType::Staticlib) {
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I wonder if this code path can even ever be hit for those crate types since those don't involve a linking step. In any case, the comment about seems fit better for the next condition. Also, is there a reason why Windows is not mentioned anymore?

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I rushed the rebase process and incorrectly resurrected the old version of the comments. Fixed in the new commit.

return;
}

// On macOS and Windows using MSVC the runtimes are distributed as dylibs
// which should be linked to both executables and dynamic libraries.
// Everywhere else the runtimes are currently distributed as static
// libraries which should be linked to executables only.
let needs_runtime = !sess.target.is_like_android
&& match crate_type {
CrateType::Executable => true,
CrateType::Dylib | CrateType::Cdylib | CrateType::ProcMacro => {
sess.target.is_like_osx || sess.target.is_like_msvc
}
CrateType::Rlib | CrateType::Staticlib => false,
};

if !needs_runtime {
if matches!(crate_type, CrateType::Dylib | CrateType::Cdylib | CrateType::ProcMacro)
&& !(sess.target.is_like_osx || sess.target.is_like_msvc)
{
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Hm, isn't this the wrong way around now? That is, if this is some kind of dylib, then we do need to link the runtime on osx- and msvc-like platforms.

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Correct. Fixed.

return;
}

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2 changes: 2 additions & 0 deletions compiler/rustc_session/src/options.rs
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Expand Up @@ -1645,6 +1645,8 @@ options! {
"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"),
external_clangrt: bool = (false, parse_bool, [UNTRACKED],
"rely on user specified linker commands to find clangrt"),
extra_const_ub_checks: bool = (false, parse_bool, [TRACKED],
"turns on more checks to detect const UB, which can be slow (default: no)"),
#[rustc_lint_opt_deny_field_access("use `Session::fewer_names` instead of this field")]
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