From: Mike Hommey <mh@glandium.org>
Date: Tue, 14 Feb 2023 23:44:19 +0000 (+0900)
Subject: Use compiler macros to detect big endian
X-Git-Tag: archive/raspbian/102.15.1esr-1_deb12u1+rpi1^2~20
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=0a3bfab8771b146c78457cf9d1e683806bb63e1b;p=firefox-esr.git

Use compiler macros to detect big endian

Both clang and GCC define endianness as builtin defines.

Gbp-Pq: Topic porting
Gbp-Pq: Name Use-compiler-macros-to-detect-big-endian.patch
---

diff --git a/third_party/wasm2c/src/common.h b/third_party/wasm2c/src/common.h
index de5e44af360..c4eb7605089 100644
--- a/third_party/wasm2c/src/common.h
+++ b/third_party/wasm2c/src/common.h
@@ -103,6 +103,14 @@
 #define PRIaddress PRIu64
 #define PRIoffset PRIzx
 
+#ifndef WABT_BIG_ENDIAN
+#  if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
+#    define WABT_BIG_ENDIAN 1
+#  elif __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+#    define WABT_BIG_ENDIAN 0
+#  endif
+#endif
+
 namespace wabt {
 #if WABT_BIG_ENDIAN
   inline void MemcpyEndianAware(void *dst, const void *src, size_t dsize, size_t ssize, size_t doff, size_t soff, size_t len) {
diff --git a/third_party/wasm2c/src/prebuilt/wasm2c.include.c b/third_party/wasm2c/src/prebuilt/wasm2c.include.c
index d1ca3651aee..e293c537907 100644
--- a/third_party/wasm2c/src/prebuilt/wasm2c.include.c
+++ b/third_party/wasm2c/src/prebuilt/wasm2c.include.c
@@ -107,6 +107,14 @@ const char SECTION_NAME(declarations)[] =
 "#  define MEM_ACCESS_REF(mem, addr) (char*) addr\n"
 "#endif\n"
 "\n"
+"#ifndef WABT_BIG_ENDIAN\n"
+"#  if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__\n"
+"#    define WABT_BIG_ENDIAN 1\n"
+"#  elif __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__\n"
+"#    define WABT_BIG_ENDIAN 0\n"
+"#  endif\n"
+"#endif\n"
+"\n"
 "#if WABT_BIG_ENDIAN\n"
 "static inline void load_data(void *dest, const void *src, size_t n) {\n"
 "  size_t i = 0;\n"
diff --git a/third_party/wasm2c/src/wasm2c.c.tmpl b/third_party/wasm2c/src/wasm2c.c.tmpl
index 0c6dbff37ba..6a4e5d6aebd 100644
--- a/third_party/wasm2c/src/wasm2c.c.tmpl
+++ b/third_party/wasm2c/src/wasm2c.c.tmpl
@@ -104,6 +104,14 @@ void WASM2C_MALLOC_FAIL_CALLBACK(u32 ptr_size);
 #  define MEM_ACCESS_REF(mem, addr) (char*) addr
 #endif
 
+#ifndef WABT_BIG_ENDIAN
+#  if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
+#    define WABT_BIG_ENDIAN 1
+#  elif __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+#    define WABT_BIG_ENDIAN 0
+#  endif
+#endif
+
 #if WABT_BIG_ENDIAN
 static inline void load_data(void *dest, const void *src, size_t n) {
   size_t i = 0;