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The patch is needed in order to support recent glibc (2.34).
Upstream-Status: Backport [https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=91f8a7a34cf29ae7c465603a801326767f1cc7e9]
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
---
--- a/libsanitizer/sanitizer_common/sanitizer_posix_libcdep.cpp 2022-03-15 07:59:54.515325204 -0700
+++ b/libsanitizer/sanitizer_common/sanitizer_posix_libcdep.cpp 2022-03-15 08:01:45.919405931 -0700
@@ -166,9 +166,10 @@
#if !SANITIZER_GO
// TODO(glider): different tools may require different altstack size.
static uptr GetAltStackSize() {
- // SIGSTKSZ is not enough.
- static const uptr kAltStackSize = SIGSTKSZ * 4;
- return kAltStackSize;
+ // Note: since GLIBC_2.31, SIGSTKSZ may be a function call, so this may be
+ // more costly that you think. However GetAltStackSize is only call 2-3 times
+ // per thread so don't cache the evaluation.
+ return SIGSTKSZ * 4;
}
void SetAlternateSignalStack() {
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