Mercurial > gnulib
view m4/malloc.m4 @ 1089:d02ee0800a52
Add insurance: tell xmalloc.c we've done the test.
author | Jim Meyering <jim@meyering.net> |
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date | Mon, 03 Nov 1997 15:18:09 +0000 |
parents | 54893e13ca01 |
children | 4f570ca4ec8d |
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#serial 1 dnl From Jim Meyering. dnl Determine whether malloc accepts 0 as its argument. dnl If it doesn't, arrange to use the replacement function. dnl dnl If you use this macro in a package, you should dnl add the following two lines to acconfig.h: dnl /* Define to rpl_malloc if the replacement function should be used. */ dnl #undef malloc dnl AC_DEFUN(jm_FUNC_MALLOC, [ if test x = y; then dnl This code is deliberately never run via ./configure. dnl FIXME: this is a gross hack to make autoheader put an entry dnl for this symbol in config.h.in. AC_CHECK_FUNCS(DONE_WORKING_MALLOC_CHECK) fi dnl xmalloc.c requires that this symbol be defined so it doesn't dnl mistakenly use a broken malloc -- as it might if this test were omitted. ac_kludge=HAVE_DONE_WORKING_MALLOC_CHECK AC_DEFINE_UNQUOTED($ac_kludge) AC_CACHE_CHECK([for working malloc], jm_cv_func_working_malloc, [AC_TRY_RUN([ char *malloc (); int main () { exit (malloc (0) ? 0 : 1); } ], jm_cv_func_working_malloc=yes, jm_cv_func_working_malloc=no, dnl When crosscompiling, assume malloc is broken. jm_cv_func_working_malloc=no) ]) if test $jm_cv_func_working_malloc = no; then LIBOBJS="$LIBOBJS malloc.o" AC_DEFINE_UNQUOTED(malloc, rpl_malloc) fi ])