From: Jonathan Wakely <jwakely@redhat.com>
Date: Tue, 18 Jan 2022 10:01:23 +0000 (+0000)
Subject: libstdc++: Use GCC's predefined macro for endianness [PR104080]
X-Git-Tag: basepoints/gcc-13~1648
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=8f6b62e0f0c99e421d07bf1847259744db22924b;p=thirdparty%2Fgcc.git

libstdc++: Use GCC's predefined macro for endianness [PR104080]

Instead of hardcoded preprocessor conditionals with explicit target
checks, just rely on the fact that __BYTE_ORDER__ is always defined by
GCC.

libstdc++-v3/ChangeLog:

	PR libstdc++/104080
	* src/c++17/fast_float/LOCAL_PATCHES: Update.
	* src/c++17/fast_float/fast_float.h (FASTFLOAT_IS_BIG_ENDIAN):
	Define in terms of __BYTE_ORDER__.
---

diff --git a/libstdc++-v3/src/c++17/fast_float/LOCAL_PATCHES b/libstdc++-v3/src/c++17/fast_float/LOCAL_PATCHES
index 447c7ed2cdbe..5bb429333986 100644
--- a/libstdc++-v3/src/c++17/fast_float/LOCAL_PATCHES
+++ b/libstdc++-v3/src/c++17/fast_float/LOCAL_PATCHES
@@ -1,3 +1,4 @@
 r12-6647
 r12-6648
 r12-6664
+r12-6665
diff --git a/libstdc++-v3/src/c++17/fast_float/fast_float.h b/libstdc++-v3/src/c++17/fast_float/fast_float.h
index ee129309ba30..31fb88b8aba7 100644
--- a/libstdc++-v3/src/c++17/fast_float/fast_float.h
+++ b/libstdc++-v3/src/c++17/fast_float/fast_float.h
@@ -128,7 +128,9 @@ from_chars_result from_chars_advanced(const char *first, const char *last,
 #define FASTFLOAT_VISUAL_STUDIO 1
 #endif
 
-#ifdef _WIN32
+#ifdef __BYTE_ORDER__
+#define FASTFLOAT_IS_BIG_ENDIAN (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
+#elif defined _WIN32
 #define FASTFLOAT_IS_BIG_ENDIAN 0
 #else
 #if defined(__APPLE__) || defined(__FreeBSD__)