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* lib/autoconf/c.m4 (AC_C_BIGENDIAN): Handle ACTION-IF-TRUE,

Browse Source 
ACTION-IF-FALSE, and ACTION-IF-UNKNOWN.
* doc/autoconf.texi (C Compiler Characteristics): Update
documentation for AC_C_BIGENDIAN.
This commit is contained in:
Alexandre Duret-Lutz 2001-08-12 12:23:49 +00:00
parent 6667f46047
commit a5b70717c1
4 changed files with 36 additions and 11 deletions

7
ChangeLog

@ -1,3 +1,10 @@
2001-08-11 Alexandre Duret-Lutz <duret_g@epita.fr>
* lib/autoconf/c.m4 (AC_C_BIGENDIAN): Handle ACTION-IF-TRUE,
ACTION-IF-FALSE, and ACTION-IF-UNKNOWN.
* doc/autoconf.texi (C Compiler Characteristics): Update
documentation for AC_C_BIGENDIAN.
2001-08-11 Alexandre Duret-Lutz <duret_g@epita.fr>
* lib/autoconf/c.m4 (AC_C_BIGENDIAN): Guess endianness by grep'ing

4
NEWS

@ -12,6 +12,10 @@
- The top level $prefix is propagated to the AC_CONFIG_SUBDIRS configures.
** C Macros
- AC_C_BIGENDIAN supports the cross-compiling case.
- AC_C_BIGENDIAN accepts ACTION-IF-TRUE, ACTION-IF-FALSE, and
ACTION-IF-UNKNOWN arguments. All are facultative, and the default
for ACTION-IF-TRUE is to define WORDS_BIGENDIAN like AC_C_BIGENDIAN
always did.
* Major changes in Autoconf 2.52
** Documentation

18
doc/autoconf.texi

@ -4486,14 +4486,26 @@ features. To check for characteristics not listed here, use
@code{AC_TRY_COMPILE} (@pxref{Examining Syntax}) or @code{AC_TRY_RUN}
(@pxref{Run Time})
@defmac AC_C_BIGENDIAN
@defmac AC_C_BIGENDIAN (@ovar{action-if-true}, @ovar{action-if-false}, @ovar{action-if-unknown})
@maindex C_BIGENDIAN
@cvindex WORDS_BIGENDIAN
@cindex Endianness
If words are stored with the most significant byte first (like Motorola
and SPARC, but not Intel and VAX, CPUs), define @code{WORDS_BIGENDIAN}.
@end defmac
and SPARC CPUs), execute @var{action-if-true}. If words are stored with
the less significant byte first (like Intel and VAX CPUs), execute
@var{action-if-false}.
This macro runs a test-case if endianness cannot be determined from the
system header files. When cross-compiling the test-case is not run but
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.
The default for @var{action-if-true} is to define
@samp{WORDS_BIGENDIAN}. The default for @var{action-if-false} is to do
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
@defmac AC_C_CONST
@maindex C_CONST

18
lib/autoconf/c.m4

@ -828,8 +828,8 @@ fi
])# AC_C_LONG_DOUBLE
# AC_C_BIGENDIAN
# --------------
# AC_C_BIGENDIAN ([ACTION-IF-TRUE], [ACTION-IF-FALSE], [ACTION-IF-UNKNOWN])
# -------------------------------------------------------------------------
AC_DEFUN([AC_C_BIGENDIAN],
[AC_CACHE_CHECK(whether byte ordering is bigendian, ac_cv_c_bigendian,
[# See if sys/param.h defines the BYTE_ORDER macro.
@ -884,14 +884,16 @@ if test `grep -l LiTTleEnDian conftest.$ac_objext` ; then
fi])])])])
case $ac_cv_c_bigendian in
yes)
AC_DEFINE(WORDS_BIGENDIAN, 1,
[Define if your processor stores words with the most significant
byte first (like Motorola and SPARC, unlike Intel and VAX).]);;
m4_default([$1],
[AC_DEFINE([WORDS_BIGENDIAN], 1,
[Define if your processor stores words with the most significant
byte first (like Motorola and SPARC, unlike Intel and VAX).])]) ;;
no)
;;
$2 ;;
*)
AC_MSG_ERROR([unknown endianess
presetting ac_cv_c_bigendian=no (or yes) will help]);;
m4_default([$3],
[AC_MSG_ERROR([unknown endianess
presetting ac_cv_c_bigendian=no (or yes) will help])]) ;;
esac
])# AC_C_BIGENDIAN