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PR29961, plugin-api.h: "Could not detect architecture endianess"

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Found when attempting to build binutils on sparc sunos-5.8 where
sys/byteorder.h defines _BIG_ENDIAN but not any of the BYTE_ORDER
variants.  This patch adds the extra tests to cope with the old
machine, and tidies the header a little.

include/ChangeLog:

	* plugin-api.h: When handling non-gcc or gcc < 4.6.0 include
	necessary header files before testing macros.  Make more use
	of #elif.  Test _LITTLE_ENDIAN and _BIG_ENDIAN in final tests.
This commit is contained in:
Alan Modra 2023-05-15 22:32:32 +09:30 • committed by Arsen Arsenović
parent e4cd4f783c
commit 24f5a73aa3
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GPG key ID: 52C294301EA2C493
1 changed files with 23 additions and 22 deletions
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45
include/plugin-api.h
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@ -37,7 +37,7 @@
#error cannot find uint64_t type
#endif
/* Detect endianess based on __BYTE_ORDER__ macro. */
/* Detect endianess based on gcc's (>=4.6.0) __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__
@ -47,46 +47,47 @@
#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. */
/* Include header files to define endian macros. */
#if defined(__GLIBC__) || defined(__GNU_LIBRARY__) || defined(__ANDROID__)
#include <endian.h>
#elif defined(__SVR4) && defined(__sun)
#include <sys/byteorder.h>
#elif defined(__FreeBSD__) || defined(__NetBSD__) || \
defined(__DragonFly__) || defined(__minix)
#include <sys/endian.h>
#elif 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
#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
#elif defined _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)
#elif defined _WIN32
#define PLUGIN_LITTLE_ENDIAN 1
#endif
/* Detect based on __BIG_ENDIAN__ and __LITTLE_ENDIAN__ */
#ifdef __LITTLE_ENDIAN__
#elif defined __LITTLE_ENDIAN__ || defined _LITTLE_ENDIAN
#define PLUGIN_LITTLE_ENDIAN 1
#endif
#ifdef __BIG_ENDIAN__
#elif defined __BIG_ENDIAN__ || defined _BIG_ENDIAN
#define PLUGIN_BIG_ENDIAN 1
#endif
#endif