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41 lines
1.2 KiB
Plaintext
41 lines
1.2 KiB
Plaintext
#serial 6
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dnl From Jim Meyering.
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dnl Determine whether realloc works when both arguments are 0.
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dnl If it doesn't, arrange to use the replacement function.
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dnl
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AC_DEFUN([jm_FUNC_REALLOC],
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[
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dnl xmalloc.c requires that this symbol be defined so it doesn't
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dnl mistakenly use a broken realloc -- as it might if this test were omitted.
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AC_DEFINE(HAVE_DONE_WORKING_REALLOC_CHECK, 1,
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[Define if the realloc check has been performed. ])
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AC_CACHE_CHECK([whether realloc(0,0) returns a non-NULL pointer],
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jm_cv_func_working_realloc,
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[AC_TRY_RUN([
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char *realloc ();
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int
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main ()
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{
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exit (realloc (0, 0) ? 0 : 1);
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}
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],
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jm_cv_func_working_realloc=yes,
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jm_cv_func_working_realloc=no,
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dnl When crosscompiling, assume realloc(0,0) returns NULL.
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jm_cv_func_working_realloc=no)
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])
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if test $jm_cv_func_working_realloc = yes; then
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AC_DEFINE([HAVE_REALLOC], 1,
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[Define to 1 if your system has a working `realloc' function,
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and to 0 otherwise.])
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else
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AC_DEFINE([HAVE_REALLOC], 0)
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AC_LIBOBJ(realloc)
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AC_DEFINE(realloc, rpl_realloc,
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[Define to rpl_realloc if the replacement function should be used.])
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fi
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])
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