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* [gcc(refs/vendors/redhat/heads/gcc-10-branch)] Improve endianess detection.
@ 2020-03-25 10:12 Jakub Jelinek
0 siblings, 0 replies; only message in thread
From: Jakub Jelinek @ 2020-03-25 10:12 UTC (permalink / raw)
To: gcc-cvs
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;
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