gcc: sanitizer: Fix tsan against glibc 2.34

The patch is needed in order to support recent glibc (2.34).

libsanitizer/ChangeLog:
	PR sanitizer/101749
        * sanitizer_common/sanitizer_posix_libcdep.cpp: Prevent
	generation of dependency on _cxa_guard for static
	initialization.

(From OE-Core rev: c44c4e7fb3c860d9fcb2aada0c9d4acb1e1e8101)

Signed-off-by: Sundeep KOKKONDA <sundeep.kokkonda@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 24 insertions, 0 deletions

diff --git a/meta/recipes-devtools/gcc/gcc-11.2.inc b/meta/recipes-devtools/gcc/gcc-11.2.inc
index 2394c86e29..68e0d203fc 100644
--- a/meta/recipes-devtools/gcc/gcc-11.2.inc
+++ b/meta/recipes-devtools/gcc/gcc-11.2.inc
@@ -68,6 +68,7 @@ SRC_URI = "\
            file://0003-CVE-2021-42574.patch \
            file://0004-CVE-2021-42574.patch \
            file://0001-CVE-2021-46195.patch \
+           file://0042-Fix-thread-stack-size-init.patch \
 "
 SRC_URI[sha256sum] = "d08edc536b54c372a1010ff6619dd274c0f1603aa49212ba20f7aa2cda36fa8b"
 
diff --git a/meta/recipes-devtools/gcc/gcc/0042-Fix-thread-stack-size-init.patch b/meta/recipes-devtools/gcc/gcc/0042-Fix-thread-stack-size-init.patch
new file mode 100644
index 0000000000..3fb9ee98de
--- /dev/null
+++ b/meta/recipes-devtools/gcc/gcc/0042-Fix-thread-stack-size-init.patch
@@ -0,0 +1,23 @@
+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() {