- AC_CACHE_CHECK([whether realloc(0,0) returns a non-NULL pointer],
- jm_cv_func_working_realloc,
- [AC_TRY_RUN([
- char *realloc ();
- int
- main ()
- {
- exit (realloc (0, 0) ? 0 : 1);
- }
- ],
- jm_cv_func_working_realloc=yes,
- jm_cv_func_working_realloc=no,
- dnl When crosscompiling, assume realloc(0,0) returns NULL.
- jm_cv_func_working_realloc=no)
- ])
- if test $jm_cv_func_working_realloc = no; then
- AC_LIBOBJ(realloc)
- AC_DEFINE(realloc, rpl_realloc,
- [Define to rpl_realloc if the replacement function should be used.])
+])
+
+# gl_FUNC_REALLOC_GNU
+# -------------------
+# Test whether 'realloc (0, 0)' is handled like in GNU libc, and replace
+# realloc if it is not.
+AC_DEFUN([gl_FUNC_REALLOC_GNU],
+[
+ AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
+ dnl _AC_FUNC_REALLOC_IF is defined in Autoconf.
+ _AC_FUNC_REALLOC_IF(
+ [AC_DEFINE([HAVE_REALLOC_GNU], [1],
+ [Define to 1 if your system has a GNU libc compatible 'realloc'
+ function, and to 0 otherwise.])],
+ [AC_DEFINE([HAVE_REALLOC_GNU], [0])
+ REPLACE_REALLOC=1
+ ])
+])# gl_FUNC_REALLOC_GNU
+
+# gl_FUNC_REALLOC_POSIX
+# ---------------------
+# Test whether 'realloc' is POSIX compliant (sets errno to ENOMEM when it
+# fails), and replace realloc if it is not.
+AC_DEFUN([gl_FUNC_REALLOC_POSIX],
+[
+ AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
+ AC_REQUIRE([gl_CHECK_MALLOC_POSIX])
+ if test $gl_cv_func_malloc_posix = yes; then
+ AC_DEFINE([HAVE_REALLOC_POSIX], [1],
+ [Define if the 'realloc' function is POSIX compliant.])
+ else
+ REPLACE_REALLOC=1