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58 lines
2.1 KiB
Plaintext
58 lines
2.1 KiB
Plaintext
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# Code swiped wholesale from the GCC project, see
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# http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12100
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# This file can go away once autoconf 2.58 is out and being used -
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# it's reported that this is fixed in the autoconf cvs already.
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# AC_LANG_FUNC_LINK_TRY(C)(FUNCTION)
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# ----------------------------------
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# Don't include <ctype.h> because on OSF/1 3.0 it includes
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# <sys/types.h> which includes <sys/select.h> which contains a
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# prototype for select. Similarly for bzero.
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#
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# A similar problem afflicts HP/UX, but it also hits <sys/time.h>
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#
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# This test used to merely assign f=$1 in main(), but that was
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# optimized away by HP unbundled cc A.05.36 for ia64 under +O3,
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# presumably on the basis that there's no need to do that store if the
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# program is about to exit. Conversely, the AIX linker optimizes an
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# unused external declaration that initializes f=$1. So this test
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# program has both an external initialization of f, and a use of f in
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# main that affects the exit status.
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#
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m4_define([AC_LANG_FUNC_LINK_TRY(C)],
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[AC_LANG_PROGRAM(
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[/* System header to define __stub macros and hopefully few prototypes,
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which can conflict with char $1 (); below.
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Prefer <limits.h> to <assert.h> if __STDC__ is defined, since
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<limits.h> exists even on freestanding compilers. Under hpux,
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including <limits.h> includes <sys/time.h> and causes problems
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checking for functions defined therein. */
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#if defined (__STDC__) && !defined (_HPUX_SOURCE)
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# include <limits.h>
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#else
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# include <assert.h>
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#endif
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/* Override any gcc2 internal prototype to avoid an error. */
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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/* We use char because int might match the return type of a gcc2
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builtin and then its argument prototype would still apply. */
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char $1 ();
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/* The GNU C library defines this for functions which it implements
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to always fail with ENOSYS. Some functions are actually named
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something starting with __ and the normal name is an alias. */
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#if defined (__stub_$1) || defined (__stub___$1)
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choke me
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#else
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char (*f) () = $1;
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#endif
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#ifdef __cplusplus
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}
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#endif
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], [return f != $1;])])
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