sanitizer: Fix endianness checks for gcc

Summary:
__BIG_ENDIAN__ and __LITTLE_ENDIAN__ are not supported by gcc, which
eg. for ubsan Value::getFloatValue will silently fall through to
the little endian branch, breaking display of float values by ubsan.
Use __BYTE_ORDER__ == __ORDER_BIG/LITTLE_ENDIAN__ as the condition
instead, which is supported by both clang and gcc.

Noticed while porting ubsan to s390x.

Patch by Marcin Kościelnicki!

Differential Revision: http://reviews.llvm.org/D17660

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@263077 91177308-0d34-0410-b5e6-96231b3b80d8

4 files changed, 6 insertions, 6 deletions

diff --git a/lib/asan/asan_report.cc b/lib/asan/asan_report.cc
index 94fe04e26..9a67f2d19 100644
--- a/lib/asan/asan_report.cc
+++ b/lib/asan/asan_report.cc
@@ -471,7 +471,7 @@ bool DescribeAddressIfStack(uptr addr, uptr access_size) {
   // previously. That's unfortunate, but I have no better solution,
   // especially given that the alloca may be from entirely different place
   // (e.g. use-after-scope, or different thread's stack).
-#if defined(__powerpc64__) && defined(__BIG_ENDIAN__)
+#if defined(__powerpc64__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
   // On PowerPC64 ELFv1, the address of a function actually points to a
   // three-doubleword data structure with the first field containing
   // the address of the function's code.
diff --git a/lib/sanitizer_common/sanitizer_symbolizer_libcdep.cc b/lib/sanitizer_common/sanitizer_symbolizer_libcdep.cc
index 7b0d9c406..e82581fe6 100644
--- a/lib/sanitizer_common/sanitizer_symbolizer_libcdep.cc
+++ b/lib/sanitizer_common/sanitizer_symbolizer_libcdep.cc
@@ -209,9 +209,9 @@ class LLVMSymbolizerProcess : public SymbolizerProcess {
     const char* const kSymbolizerArch = "--default-arch=arm64";
 #elif defined(__arm__)
     const char* const kSymbolizerArch = "--default-arch=arm";
-#elif defined(__powerpc64__) && defined(__BIG_ENDIAN__)
+#elif defined(__powerpc64__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
     const char* const kSymbolizerArch = "--default-arch=powerpc64";
-#elif defined(__powerpc64__) && defined(__LITTLE_ENDIAN__)
+#elif defined(__powerpc64__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
     const char* const kSymbolizerArch = "--default-arch=powerpc64le";
 #else
     const char* const kSymbolizerArch = "--default-arch=unknown";
diff --git a/lib/tsan/rtl/tsan_interceptors.cc b/lib/tsan/rtl/tsan_interceptors.cc
index 76cd740ed..5e541f264 100644
--- a/lib/tsan/rtl/tsan_interceptors.cc
+++ b/lib/tsan/rtl/tsan_interceptors.cc
@@ -87,10 +87,10 @@ struct ucontext_t {
 #endif
 
 #if defined(__x86_64__) || defined(__mips__) \
-  || (defined(__powerpc64__) && defined(__BIG_ENDIAN__))
+  || (defined(__powerpc64__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
 #define PTHREAD_ABI_BASE  "GLIBC_2.3.2"
 #elif defined(__aarch64__) || (defined(__powerpc64__) \
-  && defined(__LITTLE_ENDIAN__))
+  && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
 #define PTHREAD_ABI_BASE  "GLIBC_2.17"
 #endif
 
diff --git a/lib/ubsan/ubsan_value.cc b/lib/ubsan/ubsan_value.cc
index 79dc4c8e8..72faf2ee1 100644
--- a/lib/ubsan/ubsan_value.cc
+++ b/lib/ubsan/ubsan_value.cc
@@ -83,7 +83,7 @@ FloatMax Value::getFloatValue() const {
 #endif
       case 32: {
         float Value;
-#if defined(__BIG_ENDIAN__)
+#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
        // For big endian the float value is in the last 4 bytes.
        // On some targets we may only have 4 bytes so we count backwards from
        // the end of Val to account for both the 32-bit and 64-bit cases.