+AC_DEFUN([gl_FUNC_GETCWD_SIGNATURE],
+[
+ AC_CACHE_CHECK([for getcwd with POSIX signature],
+ [gl_cv_func_getcwd_posix_signature],
+ [AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#include <unistd.h>]],
+ [[extern
+ #ifdef __cplusplus
+ "C"
+ #endif
+ char *getcwd (char *, size_t);
+ ]])
+ ],
+ [gl_cv_func_getcwd_posix_signature=yes],
+ [gl_cv_func_getcwd_posix_signature=no])
+ ])
+])
+
+dnl Guarantee that getcwd will malloc with a NULL first argument. Assumes
+dnl that either the system getcwd is robust, or that calling code is okay
+dnl with spurious failures when run from a directory with an absolute name
+dnl larger than 4k bytes.
+dnl
+dnl Assumes that getcwd exists; if you are worried about obsolete
+dnl platforms that lacked getcwd(), then you need to use the GPL module.
+AC_DEFUN([gl_FUNC_GETCWD_LGPL],
+[
+ AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+ AC_REQUIRE([gl_FUNC_GETCWD_NULL])
+ AC_REQUIRE([gl_FUNC_GETCWD_SIGNATURE])
+
+ case $gl_cv_func_getcwd_null,$gl_cv_func_getcwd_posix_signature in
+ *yes,yes) ;;
+ *)
+ dnl Minimal replacement lib/getcwd-lgpl.c.
+ REPLACE_GETCWD=1
+ ;;
+ esac
+])
+
+dnl Check for all known getcwd bugs; useful for a program likely to be
+dnl executed from an arbitrary location.