44 lines
1.3 KiB
Text
44 lines
1.3 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_kludge=HAVE_DONE_WORKING_MALLOC_CHECK
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AC_DEFINE_UNQUOTED($ac_kludge)
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AC_CACHE_CHECK([for working malloc], jm_cv_func_working_malloc,
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[AC_TRY_RUN([
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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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dnl When crosscompiling, assume malloc is broken.
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jm_cv_func_working_malloc=no)
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])
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if test $jm_cv_func_working_malloc = no; then
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LIBOBJS="$LIBOBJS malloc.o"
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AC_DEFINE_UNQUOTED(malloc, rpl_malloc)
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fi
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])
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