44 lines
1.4 KiB
Text
44 lines
1.4 KiB
Text
#serial 1
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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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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_realloc if the replacement function should be used. */
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dnl #undef realloc
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dnl
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AC_DEFUN(jm_FUNC_REALLOC,
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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_REALLOC_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 realloc -- as it might if this test were omitted.
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AC_DEFINE(HAVE_DONE_WORKING_REALLOC_CHECK, 1, [Needed for xmalloc.c])
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AC_CACHE_CHECK([for working realloc], 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 is broken.
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jm_cv_func_working_realloc=no)
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])
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if test $jm_cv_func_working_realloc = no; then
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dnl This should be converted to: AC_LIBOBJ([realloc])
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LIBOBJS="$LIBOBJS realloc.$ac_objext"
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AC_DEFINE(realloc, rpl_realloc, [Replacement realloc()])
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fi
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])
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