[Bug sanitizer/82379] [7/8 Regression] internal_sigreturn not defined in libasan.so or libubsan.so with -mx32

["steven at uplinklabs dot net" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82379

--- Comment #3 from Steven Noonan <steven at uplinklabs dot net> ---
Are you sure that patch is sufficient? __x86_64__ is defined on both the normal
x86_64 ABI and on the x32 ABI. The combination most often used to identify x32
is 'defined(__x86_64__) && defined(__ILP32__)'

I've currently got this patch applied locally which allows me to build against
the x32 ABI with -fsanitize=foo:

diff --git a/libsanitizer/sanitizer_common/sanitizer_linux.cc
b/libsanitizer/sanitizer_common/sanitizer_linux.cc
index 5b6f18602e7..a11592614a4 100644
--- a/libsanitizer/sanitizer_common/sanitizer_linux.cc
+++ b/libsanitizer/sanitizer_common/sanitizer_linux.cc
@@ -674,7 +674,7 @@ int internal_sigaction_syscall(int signum, const void *act,
void *oldact) {
     return internal_sigaction_norestorer(signum, act, oldact);
   __sanitizer_sigaction u_adjust;
   internal_memcpy(&u_adjust, act, sizeof(u_adjust));
-#if !SANITIZER_ANDROID || !SANITIZER_MIPS32
+#if (!SANITIZER_ANDROID || !SANITIZER_MIPS32) && !defined(__ILP32__)
     if (u_adjust.sa_restorer == nullptr) {
       u_adjust.sa_restorer = internal_sigreturn;
     }