42 lines
1.3 KiB
Text
42 lines
1.3 KiB
Text
#serial 1
|
|
|
|
dnl From Jim Meyering.
|
|
dnl Determine whether realloc works when both arguments are 0.
|
|
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_realloc if the replacement function should be used. */
|
|
dnl #undef realloc
|
|
dnl
|
|
|
|
AC_DEFUN([jm_FUNC_REALLOC],
|
|
[
|
|
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_REALLOC_CHECK)
|
|
fi
|
|
dnl xmalloc.c requires that this symbol be defined so it doesn't
|
|
dnl mistakenly use a broken realloc -- as it might if this test were omitted.
|
|
AC_DEFINE(HAVE_DONE_WORKING_REALLOC_CHECK, 1, [Needed for xmalloc.c])
|
|
|
|
AC_CACHE_CHECK([for working realloc], jm_cv_func_working_realloc,
|
|
[AC_RUN_IFELSE([AC_LANG_SOURCE([
|
|
char *realloc ();
|
|
int
|
|
main ()
|
|
{
|
|
exit (realloc (0, 0) ? 0 : 1);
|
|
}
|
|
])],
|
|
[jm_cv_func_working_realloc=yes],
|
|
[jm_cv_func_working_realloc=no],
|
|
[When crosscompiling])
|
|
])
|
|
if test $jm_cv_func_working_realloc = no; then
|
|
AC_LIBOBJ([realloc])
|
|
AC_DEFINE(realloc, rpl_realloc, [Replacement realloc()])
|
|
fi
|
|
])
|