Merge pull request #1217 from anpol:macos-sigaltstack

PiperOrigin-RevId: 460713135
Change-Id: If7ea94f409edc1e4024d7eaa4ae025b0b258fc02

absl/debugging/failure_signal_handler.cc

@@ -50,7 +50,9 @@
 #ifndef _WIN32
 #ifndef _WIN32
 #define ABSL_HAVE_SIGACTION
 #define ABSL_HAVE_SIGACTION
 // Apple WatchOS and TVOS don't allow sigaltstack
 // Apple WatchOS and TVOS don't allow sigaltstack
-#if !(defined(TARGET_OS_WATCH) && TARGET_OS_WATCH) && \
+// Apple macOS has sigaltstack, but using it makes backtrace() unusable.
+#if !(defined(TARGET_OS_OSX) && TARGET_OS_OSX) &&     \
+    !(defined(TARGET_OS_WATCH) && TARGET_OS_WATCH) && \
     !(defined(TARGET_OS_TV) && TARGET_OS_TV) && !defined(__QNX__)
     !(defined(TARGET_OS_TV) && TARGET_OS_TV) && !defined(__QNX__)
 #define ABSL_HAVE_SIGALTSTACK
 #define ABSL_HAVE_SIGALTSTACK
 #endif
 #endif