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Allow implicit function decl on A64

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Testing in <https://github.com/rust-lang/rust/pull/131221>, we found
that <https://github.com/rust-lang/compiler-builtins/pull/627> is
unusable with the current LLVM version.
This commit is contained in:
Alan Wu 2024-10-04 12:33:16 -04:00
parent f4bde3fdc9
commit 3f70601e3c
1 changed files with 10 additions and 2 deletions
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12
library/compiler-builtins/build.rs
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@ -327,8 +327,16 @@ mod c {
// in https://github.com/rust-lang/compiler-rt/blob/c8fbcb3/cmake/config-ix.cmake#L19.
cfg.flag_if_supported("-fomit-frame-pointer");
cfg.define("VISIBILITY_HIDDEN", None);
// Avoid implicitly creating references to undefined functions
cfg.flag("-Werror=implicit-function-declaration");
if let "aarch64" | "arm64ec" = target.arch.as_str() {
// FIXME(llvm20): Older GCCs on A64 fail to build with
// -Werror=implicit-function-declaration due to a compiler-rt bug.
// With a newer LLVM we should be able to enable the flag everywhere.
// https://github.com/llvm/llvm-project/commit/8aa9d6206ce55bdaaf422839c351fbd63f033b89
} else {
// Avoid implicitly creating references to undefined functions
cfg.flag("-Werror=implicit-function-declaration");
}
}
// int_util.c tries to include stdlib.h if `_WIN32` is defined,