- AC_CACHE_CHECK([whether malloc(0) returns a non-NULL pointer],
- 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(0) returns NULL.
- jm_cv_func_working_malloc=no)
- ])
- if test $jm_cv_func_working_malloc = no; then
- AC_LIBOBJ(malloc)
- AC_DEFINE(malloc, rpl_malloc,
- [Define to rpl_malloc if the replacement function should be used.])
+])
+
+# gl_FUNC_MALLOC_GNU
+# ------------------
+# Test whether 'malloc (0)' is handled like in GNU libc, and replace malloc if
+# it is not.
+AC_DEFUN([gl_FUNC_MALLOC_GNU],
+[
+ AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
+ dnl _AC_FUNC_MALLOC_IF is defined in Autoconf.
+ _AC_FUNC_MALLOC_IF(
+ [AC_DEFINE([HAVE_MALLOC_GNU], [1],
+ [Define to 1 if your system has a GNU libc compatible 'malloc'
+ function, and to 0 otherwise.])],
+ [AC_DEFINE([HAVE_MALLOC_GNU], [0])
+ REPLACE_MALLOC=1
+ ])
+])
+
+# gl_FUNC_MALLOC_POSIX
+# --------------------
+# Test whether 'malloc' is POSIX compliant (sets errno to ENOMEM when it
+# fails), and replace malloc if it is not.
+AC_DEFUN([gl_FUNC_MALLOC_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_MALLOC_POSIX], [1],
+ [Define if the 'malloc' function is POSIX compliant.])
+ else
+ REPLACE_MALLOC=1