[gcc(refs/vendors/redhat/heads/gcc-10-branch)] Improve endianess detection.

[gcc(refs/vendors/redhat/heads/gcc-10-branch)] Improve endianess detection.

[Jakub Jelinek]

https://gcc.gnu.org/g:906b3eb9df6c577d3f6e9c3ea5c9d7e4d1e90536

commit 906b3eb9df6c577d3f6e9c3ea5c9d7e4d1e90536
Author: Martin Liska <mliska@suse.cz>
Date:   Tue Mar 24 11:40:10 2020 +0100

    Improve endianess detection.
    
            PR lto/94249
            * plugin-api.h: Add more robust endianess detection.

Diff:
---
 include/ChangeLog    |  5 ++++
 include/plugin-api.h | 65 ++++++++++++++++++++++++++++++++++++++++++++++++++--
 2 files changed, 68 insertions(+), 2 deletions(-)

diff --git a/include/ChangeLog b/include/ChangeLog
index e7474e5fed1..a59560caf7e 100644
--- a/include/ChangeLog
+++ b/include/ChangeLog
@@ -1,3 +1,8 @@
+2020-03-24  Martin Liska  <mliska@suse.cz>
+
+	PR lto/94249
+	* plugin-api.h: Add more robust endianess detection.
+
 2020-03-21  Martin Liska  <mliska@suse.cz>
 
 	* plugin-api.h (enum ld_plugin_symbol_type): Remove
diff --git a/include/plugin-api.h b/include/plugin-api.h
index 673f136ce68..864d2bf91ac 100644
--- a/include/plugin-api.h
+++ b/include/plugin-api.h
@@ -37,6 +37,60 @@
 #error cannot find uint64_t type
 #endif
 
+/* Detect endianess based on __BYTE_ORDER__ macro.  */
+#if defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && \
+    defined(__ORDER_LITTLE_ENDIAN__) && defined(__ORDER_PDP_ENDIAN__)
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+#define PLUGIN_LITTLE_ENDIAN 1
+#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
+#define PLUGIN_BIG_ENDIAN 1
+#elif __BYTE_ORDER__ == __ORDER_PDP_ENDIAN__
+#define PLUGIN_PDP_ENDIAN 1
+#endif
+#else
+/* Older GCC releases (<4.6.0) can make detection from glibc macros.  */
+#if defined(__GLIBC__) || defined(__GNU_LIBRARY__) || defined(__ANDROID__)
+#include <endian.h>
+#ifdef _BYTE_ORDER
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+#define PLUGIN_LITTLE_ENDIAN 1
+#elif __BYTE_ORDER == __BIG_ENDIAN
+#define PLUGIN_BIG_ENDIAN 1
+#endif
+#endif
+#endif
+/* Include all necessary header files based on target.  */
+#if defined(__SVR4) && defined(__sun)
+#include <sys/byteorder.h>
+#endif
+#if defined(__FreeBSD__) || defined(__NetBSD__) || \
+    defined(__DragonFly__) || defined(__minix)
+#include <sys/endian.h>
+#endif
+#if defined(__OpenBSD__)
+#include <machine/endian.h>
+#endif
+/* Detect endianess based on _BYTE_ORDER.  */
+#ifdef _BYTE_ORDER
+#if _BYTE_ORDER == _LITTLE_ENDIAN
+#define PLUGIN_LITTLE_ENDIAN 1
+#elif _BYTE_ORDER == _BIG_ENDIAN
+#define PLUGIN_BIG_ENDIAN 1
+#endif
+#endif
+/* Detect based on _WIN32.  */
+#if defined(_WIN32)
+#define PLUGIN_LITTLE_ENDIAN 1
+#endif
+/* Detect based on __BIG_ENDIAN__ and __LITTLE_ENDIAN__ */
+#ifdef __LITTLE_ENDIAN__
+#define PLUGIN_LITTLE_ENDIAN 1
+#endif
+#ifdef __BIG_ENDIAN__
+#define PLUGIN_BIG_ENDIAN 1
+#endif
+#endif
+
 #ifdef __cplusplus
 extern "C"
 {
@@ -89,16 +143,23 @@ struct ld_plugin_symbol
   char *version;
   /* This is for compatibility with older ABIs.  The older ABI defined
      only 'def' field.  */
-#ifdef __BIG_ENDIAN__
+#if PLUGIN_BIG_ENDIAN == 1
   char unused;
   char section_kind;
   char symbol_type;
   char def;
-#else
+#elif PLUGIN_LITTLE_ENDIAN == 1
   char def;
   char symbol_type;
   char section_kind;
   char unused;
+#elif PLUGIN_PDP_ENDIAN == 1
+  char symbol_type;
+  char def;
+  char unused;
+  char section_kind;
+#else
+#error "Could not detect architecture endianess"
 #endif
   int visibility;
   uint64_t size;