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From 91f8a7a34cf29ae7c465603a801326767f1cc7e9 Mon Sep 17 00:00:00 2001
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From: Martin Liska <mliska@suse.cz>
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Date: Thu, 5 Aug 2021 10:43:17 +0200
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Subject: [PATCH] sanitizer: cherry pick
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414482751452e54710f16bae58458c66298aaf69
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The patch is needed in order to support recent glibc (2.34).
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libsanitizer/ChangeLog:
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PR sanitizer/101749
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* sanitizer_common/sanitizer_posix_libcdep.cpp: Prevent
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generation of dependency on _cxa_guard for static
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initialization.
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---
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libsanitizer/sanitizer_common/sanitizer_posix_libcdep.cpp | 7 ++++---
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1 file changed, 4 insertions(+), 3 deletions(-)
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diff --git a/libsanitizer/sanitizer_common/sanitizer_posix_libcdep.cpp b/libsanitizer/sanitizer_common/sanitizer_posix_libcdep.cpp
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index 7ff48c35851..a65b16f5290 100644
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--- a/libsanitizer/sanitizer_common/sanitizer_posix_libcdep.cpp
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+++ b/libsanitizer/sanitizer_common/sanitizer_posix_libcdep.cpp
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@@ -166,9 +166,10 @@ bool SupportsColoredOutput(fd_t fd) {
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#if !SANITIZER_GO
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// TODO(glider): different tools may require different altstack size.
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static uptr GetAltStackSize() {
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- // SIGSTKSZ is not enough.
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- static const uptr kAltStackSize = SIGSTKSZ * 4;
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- return kAltStackSize;
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+ // Note: since GLIBC_2.31, SIGSTKSZ may be a function call, so this may be
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+ // more costly that you think. However GetAltStackSize is only call 2-3 times
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+ // per thread so don't cache the evaluation.
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+ return SIGSTKSZ * 4;
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}
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void SetAlternateSignalStack() {
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--
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2.27.0
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