guix/gnu/packages/patches/gcc-asan-missing-include.patch

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Add missing include that triggers a build failure on PowerPC:
../../../../gcc-5.4.0/libsanitizer/asan/asan_linux.cc: In function bool __asan::AsanInterceptsSignal(int):
../../../../gcc-5.4.0/libsanitizer/asan/asan_linux.cc:222:20: error: SIGSEGV was not declared in this scope
return signum == SIGSEGV && common_flags()->handle_segv;
^
From <https://patchwork.ozlabs.org/patch/725596/>.
diff --git a/libsanitizer/asan/asan_linux.cc b/libsanitizer/asan/asan_linux.cc
index c504168..59087b9 100644
--- a/libsanitizer/asan/asan_linux.cc
+++ b/libsanitizer/asan/asan_linux.cc
@@ -29,6 +29,7 @@
#include <dlfcn.h>
#include <fcntl.h>
#include <pthread.h>
+#include <signal.h>
#include <stdio.h>
#include <unistd.h>
#include <unwind.h>