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autoconf/ac-c-bigendian.diff

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--- doc/autoconf.texi
+++ doc/autoconf.texi
@@ -6739,7 +6739,7 @@ New programs need not use this macro.
@anchor{AC_C_BIGENDIAN}
@defmac AC_C_BIGENDIAN (@ovar{action-if-true}, @ovar{action-if-false}, @
- @ovar{action-if-unknown}, @ovar{action-if-universal})
+ @ovar{action-if-unknown})
@acindex{C_BIGENDIAN}
@cvindex WORDS_BIGENDIAN
@cindex Endianness
@@ -6753,26 +6753,11 @@ system header files. When cross-compili
grep'ed for some magic values. @var{action-if-unknown} is executed if
the latter case fails to determine the byte sex of the host system.
-In some cases a single run of a compiler can generate code for multiple
-architectures. This can happen, for example, when generating Mac OS X
-universal binary files, which work on both PowerPC and Intel
-architectures. In this case, the different variants might be for
-different architectures whose endiannesses differ. If
-@command{configure} detects this, it executes @var{action-if-universal}
-instead of @var{action-if-unknown}.
-
The default for @var{action-if-true} is to define
@samp{WORDS_BIGENDIAN}. The default for @var{action-if-false} is to do
-nothing. The default for @var{action-if-unknown} is to
-abort configure and tell the installer how to bypass this test.
-And finally, the default for @var{action-if-universal} is to define
-@samp{WORDS_BIGENDIAN} or not, depending on the architecture that the
-code is being generated for.
-
-If you use this macro without specifying @var{action-if-universal}, you
-should also use @code{AC_CONFIG_HEADERS}; otherwise
-@samp{WORDS_BIGENDIAN} may be set incorrectly for Mac OS X universal
-binary files.
+nothing. And finally, the default for @var{action-if-unknown} is to
+abort configure and tell the installer which variable he should preset
+to bypass this test.
@end defmac
@anchor{AC_C_CONST}
--- lib/autoconf/c.m4
+++ lib/autoconf/c.m4
@@ -1393,140 +1393,74 @@ fi
])# AC_C_CHAR_UNSIGNED
-# AC_C_BIGENDIAN ([ACTION-IF-TRUE], [ACTION-IF-FALSE], [ACTION-IF-UNKNOWN],
-# [ACTION-IF-UNIVERSAL])
+# AC_C_BIGENDIAN ([ACTION-IF-TRUE], [ACTION-IF-FALSE], [ACTION-IF-UNKNOWN])
# -------------------------------------------------------------------------
AC_DEFUN([AC_C_BIGENDIAN],
-[AH_VERBATIM([WORDS_BIGENDIAN],
-[/* Define WORDS_BIGENDIAN to 1 if your processor stores words with the most
- significant byte first (like Motorola and SPARC, unlike Intel and VAX). */
-#if defined __BIG_ENDIAN__
-# define WORDS_BIGENDIAN 1
-#elif ! defined __LITTLE_ENDIAN__
-# undef WORDS_BIGENDIAN
-#endif])dnl
- AC_CACHE_CHECK([whether byte ordering is bigendian], [ac_cv_c_bigendian],
- [ac_cv_c_bigendian=unknown
- m4_ifval(m4_ifdef([AH_HEADER], 1)[$4],
- [# See if __BIG_ENDIAN__ or __LITTLE_ENDIAN__ is defined.
- AC_COMPILE_IFELSE(
- [AC_LANG_SOURCE(
- [[#if ! (defined __BIG_ENDIAN__ || defined __LITTLE_ENDIAN__)
- neither is defined;
- #endif
- typedef int dummy;
- ]])],
- [ac_cv_c_bigendian=universal])],
- [AC_DIAGNOSE([obsolete], [AC_C_BIGENDIAN suggests AC_CONFIG_HEADERS])])
- if test $ac_cv_c_bigendian = unknown; then
- # See if sys/param.h defines the BYTE_ORDER macro.
- AC_COMPILE_IFELSE(
- [AC_LANG_PROGRAM(
- [[#include <sys/types.h>
- #include <sys/param.h>
- ]],
- [[#if ! (defined BYTE_ORDER && defined BIG_ENDIAN \
- && defined LITTLE_ENDIAN && BYTE_ORDER && BIG_ENDIAN \
- && LITTLE_ENDIAN)
- bogus endian macros
- #endif
- ]])],
- [# It does; now see whether it defined to BIG_ENDIAN or not.
- AC_COMPILE_IFELSE(
- [AC_LANG_PROGRAM(
- [[#include <sys/types.h>
- #include <sys/param.h>
- ]],
- [[#if BYTE_ORDER != BIG_ENDIAN
- not big endian
- #endif
- ]])],
- [ac_cv_c_bigendian=yes],
- [ac_cv_c_bigendian=no])])
- fi
- if test $ac_cv_c_bigendian = unknown; then
- # See if <limits.h> defines _LITTLE_ENDIAN or _BIG_ENDIAN (e.g., Solaris).
- AC_COMPILE_IFELSE(
- [AC_LANG_PROGRAM(
- [[#include <limits.h>
- ]],
- [[#if ! (defined _LITTLE_ENDIAN || defined _BIG_ENDIAN)
- bogus endian macros
- #endif
- ]])],
- [# It does; now see whether it defined to _BIG_ENDIAN or not.
- AC_COMPILE_IFELSE(
- [AC_LANG_PROGRAM(
- [[#include <limits.h>
- ]],
- [[#ifndef _BIG_ENDIAN
- not big endian
- #endif
- ]])],
- [ac_cv_c_bigendian=yes],
- [ac_cv_c_bigendian=no])])
- fi
- if test $ac_cv_c_bigendian = unknown; then
- # Compile a test program.
- AC_RUN_IFELSE(
- [AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],
- [[
- /* Are we little or big endian? From Harbison&Steele. */
- union
- {
- long int l;
- char c[sizeof (long int)];
- } u;
- u.l = 1;
- return u.c[sizeof (long int) - 1] == 1;
- ]])],
- [ac_cv_c_bigendian=no],
- [ac_cv_c_bigendian=yes],
- [# Try to guess by grepping values from an object file.
- AC_COMPILE_IFELSE(
- [AC_LANG_PROGRAM(
- [[short int ascii_mm[] =
- { 0x4249, 0x4765, 0x6E44, 0x6961, 0x6E53, 0x7953, 0 };
- short int ascii_ii[] =
- { 0x694C, 0x5454, 0x656C, 0x6E45, 0x6944, 0x6E61, 0 };
- int use_ascii (int i) {
- return ascii_mm[i] + ascii_ii[i];
- }
- short int ebcdic_ii[] =
- { 0x89D3, 0xE3E3, 0x8593, 0x95C5, 0x89C4, 0x9581, 0 };
- short int ebcdic_mm[] =
- { 0xC2C9, 0xC785, 0x95C4, 0x8981, 0x95E2, 0xA8E2, 0 };
- int use_ebcdic (int i) {
- return ebcdic_mm[i] + ebcdic_ii[i];
- }
- extern int foo;
- ]],
- [[return use_ascii (foo) == use_ebcdic (foo);]])],
- [if grep BIGenDianSyS conftest.$ac_objext >/dev/null; then
- ac_cv_c_bigendian=yes
- fi
- if grep LiTTleEnDian conftest.$ac_objext >/dev/null ; then
- if test "$ac_cv_c_bigendian" = unknown; then
- ac_cv_c_bigendian=no
- else
- # finding both strings is unlikely to happen, but who knows?
- ac_cv_c_bigendian=unknown
- fi
- fi])])
- fi])
- case $ac_cv_c_bigendian in #(
- yes)
- m4_default([$1],
- [AC_DEFINE([WORDS_BIGENDIAN], 1)]);; #(
- no)
- $2 ;; #(
- universal)
- $4 ;; #(
- *)
- m4_default([$3],
- [AC_MSG_ERROR([unknown endianness
- presetting ac_cv_c_bigendian=no (or yes) will help])]) ;;
- esac
+[AC_CACHE_CHECK(whether byte ordering is bigendian, ac_cv_c_bigendian,
+[# See if sys/param.h defines the BYTE_ORDER macro.
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <sys/types.h>
+#include <sys/param.h>
+],
+[#if ! (defined BYTE_ORDER && defined BIG_ENDIAN && defined LITTLE_ENDIAN \
+ && BYTE_ORDER && BIG_ENDIAN && LITTLE_ENDIAN)
+ bogus endian macros
+#endif
+])],
+[# It does; now see whether it defined to BIG_ENDIAN or not.
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <sys/types.h>
+#include <sys/param.h>
+], [#if BYTE_ORDER != BIG_ENDIAN
+ not big endian
+#endif
+])], [ac_cv_c_bigendian=yes], [ac_cv_c_bigendian=no])],
+[# It does not; compile a test program.
+AC_RUN_IFELSE(
+[AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT], [[
+ /* Are we little or big endian? From Harbison&Steele. */
+ union
+ {
+ long int l;
+ char c[sizeof (long int)];
+ } u;
+ u.l = 1;
+ return u.c[sizeof (long int) - 1] == 1;
+]])],
+ [ac_cv_c_bigendian=no],
+ [ac_cv_c_bigendian=yes],
+[# try to guess the endianness by grepping values into an object file
+ ac_cv_c_bigendian=unknown
+ AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
+[[short int ascii_mm[] = { 0x4249, 0x4765, 0x6E44, 0x6961, 0x6E53, 0x7953, 0 };
+short int ascii_ii[] = { 0x694C, 0x5454, 0x656C, 0x6E45, 0x6944, 0x6E61, 0 };
+void _ascii () { char *s = (char *) ascii_mm; s = (char *) ascii_ii; }
+short int ebcdic_ii[] = { 0x89D3, 0xE3E3, 0x8593, 0x95C5, 0x89C4, 0x9581, 0 };
+short int ebcdic_mm[] = { 0xC2C9, 0xC785, 0x95C4, 0x8981, 0x95E2, 0xA8E2, 0 };
+void _ebcdic () { char *s = (char *) ebcdic_mm; s = (char *) ebcdic_ii; }]],
+[[ _ascii (); _ebcdic (); ]])],
+[if grep BIGenDianSyS conftest.$ac_objext >/dev/null ; then
+ ac_cv_c_bigendian=yes
+fi
+if grep LiTTleEnDian conftest.$ac_objext >/dev/null ; then
+ if test "$ac_cv_c_bigendian" = unknown; then
+ ac_cv_c_bigendian=no
+ else
+ # finding both strings is unlikely to happen, but who knows?
+ ac_cv_c_bigendian=unknown
+ fi
+fi])])])])
+case $ac_cv_c_bigendian in
+ yes)
+ m4_default([$1],
+ [AC_DEFINE([WORDS_BIGENDIAN], 1,
+ [Define to 1 if your processor stores words with the most significant
+ byte first (like Motorola and SPARC, unlike Intel and VAX).])]) ;;
+ no)
+ $2 ;;
+ *)
+ m4_default([$3],
+ [AC_MSG_ERROR([unknown endianness
+presetting ac_cv_c_bigendian=no (or yes) will help])]) ;;
+esac
])# AC_C_BIGENDIAN
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