1 files changed, 47 insertions, 0 deletions
diff --git a/gl/m4/strerror.m4 b/gl/m4/strerror.m4
new file mode 100644
index 00000000..eb7d45aa
--- /dev/null
+++ b/gl/m4/strerror.m4
@@ -0,0 +1,47 @@
+# strerror.m4 serial 7
+dnl Copyright (C) 2002, 2007 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_FUNC_STRERROR],
+[
+  AC_REQUIRE([gl_FUNC_STRERROR_SEPARATE])
+  if test $gl_cv_func_working_strerror = no; then
+    AC_LIBOBJ([strerror])
+    AC_DEFINE_UNQUOTED([REPLACE_STRERROR], [$REPLACE_STRERROR],
+      [Define this to 1 if strerror is broken.])
+  fi
+])
+
+# Like gl_FUNC_STRERROR, except prepare for separate compilation (no AC_LIBOBJ).
+AC_DEFUN([gl_FUNC_STRERROR_SEPARATE],
+[
+  AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
+  AC_CACHE_CHECK([for working strerror function],
+   [gl_cv_func_working_strerror],
+   [AC_RUN_IFELSE(
+      [AC_LANG_PROGRAM(
+	 [#include <string.h>
+	 ],
+	 [return !*strerror (-2);])],
+      [gl_cv_func_working_strerror=yes],
+      [gl_cv_func_working_strerror=no],
+      [dnl Assume crossbuild works if it compiles.
+       AC_COMPILE_IFELSE(
+	 [AC_LANG_PROGRAM(
+	    [#include <string.h>
+	    ],
+	    [return !*strerror (-2);])],
+	 [gl_cv_func_working_strerror=yes],
+	 [gl_cv_func_working_strerror=no])])])
+  if test $gl_cv_func_working_strerror = no ; then
+    REPLACE_STRERROR=1
+    gl_PREREQ_STRERROR
+  fi
+])
+
+# Prerequisites of lib/strerror.c.
+AC_DEFUN([gl_PREREQ_STRERROR], [
+  AC_CHECK_DECLS([strerror])
+])