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* lib/autoconf/c.m4 (AC_LANG_FUNC_LINK_TRY(C)): Initialize f=$1 rather

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than assigning in main, to avoid HP cc +O3 optimizing it away.
This commit is contained in:
Kevin Ryde 2002-11-13 23:34:07 +00:00
parent 77f69ee45e
commit ce95d6a9dc
2 changed files with 15 additions and 7 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2002-11-14 Kevin Ryde <user42@zip.com.au>
* lib/autoconf/c.m4 (AC_LANG_FUNC_LINK_TRY(C)): Initialize f=$1 rather
than assigning in main, to avoid HP cc +O3 optimizing it away.
2002-11-12 Peter Eisentraut <peter_e@gmx.net>
* lib/autoconf/status.m4 (_AC_OUTPUT_CONFIG_STATUS): Add -q

17
lib/autoconf/c.m4
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@ -165,6 +165,11 @@ char $2 ();])], [$2 ();])])
# Don't include <ctype.h> because on OSF/1 3.0 it includes
# <sys/types.h> which includes <sys/select.h> which contains a
# prototype for select. Similarly for bzero.
#
# This test used to assign f=$1 in main(), but that was optimized away by HP
# unbundled cc A.05.36 for ia64 under +O3, presumably on the basis that
# there's no need to do that store if the program is about to exit.
#
m4_define([AC_LANG_FUNC_LINK_TRY(C)],
[AC_LANG_PROGRAM(
[/* System header to define __stub macros and hopefully few prototypes,
@ -178,18 +183,16 @@ extern "C"
/* We use char because int might match the return type of a gcc2
builtin and then its argument prototype would still apply. */
char $1 ();
char (*f) ();
#ifdef __cplusplus
}
#endif
],
[/* The GNU C library defines this for functions which it implements
/* The GNU C library defines this for functions which it implements
to always fail with ENOSYS. Some functions are actually named
something starting with __ and the normal name is an alias. */
#if defined (__stub_$1) || defined (__stub___$1)
choke me
#else
f = $1;
char (*f) () = $1;
#endif
#ifdef __cplusplus
}
#endif
])])