42 lines
1.2 KiB
Text
42 lines
1.2 KiB
Text
#serial 1
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dnl From Jim Meyering.
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dnl Determine whether malloc accepts 0 as its argument.
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dnl If it doesn't, arrange to use the replacement function.
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dnl
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dnl If you use this macro in a package, you should
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dnl add the following two lines to acconfig.h:
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dnl /* Define to rpl_malloc if the replacement function should be used. */
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dnl #undef malloc
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dnl
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AC_DEFUN([jm_FUNC_MALLOC],
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[
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if test x = y; then
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dnl This code is deliberately never run via ./configure.
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dnl FIXME: this is a gross hack to make autoheader put an entry
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dnl for this symbol in config.h.in.
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AC_CHECK_FUNCS(DONE_WORKING_MALLOC_CHECK)
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fi
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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 malloc -- as it might if this test were omitted.
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AC_DEFINE(HAVE_DONE_WORKING_MALLOC_CHECK, 1, [Needed for xmalloc.c])
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AC_CACHE_CHECK([for working malloc], jm_cv_func_working_malloc,
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[AC_RUN_IFELSE([AC_LANG_SOURCE([
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char *malloc ();
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int
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main ()
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{
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exit (malloc (0) ? 0 : 1);
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}
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])],
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[jm_cv_func_working_malloc=yes],
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[jm_cv_func_working_malloc=no],
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[When crosscompiling])
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])
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if test $jm_cv_func_working_malloc = no; then
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AC_LIBOBJ([malloc])
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AC_DEFINE(malloc, rpl_malloc, [Replacement malloc()])
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fi
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])
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