1 files changed, 29 insertions, 0 deletions
diff --git a/gl/m4/wchar.m4 b/gl/m4/wchar.m4
new file mode 100644
index 00000000..068f22d3
--- /dev/null
+++ b/gl/m4/wchar.m4
@@ -0,0 +1,29 @@
+dnl A placeholder for ISO C99 <wchar.h>, for platforms that have issues.
+
+dnl Copyright (C) 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.
+
+dnl Written by Eric Blake.
+
+# wchar.m4 serial 1
+
+AC_DEFUN([gl_WCHAR_H],
+[
+  AC_CACHE_CHECK([whether <wchar.h> is standalone],
+    [gl_cv_header_wchar_h_standalone],
+    [AC_COMPILE_IFELSE([[#include <wchar.h>
+wchar_t w;]],
+      [gl_cv_header_wchar_h_standalone=yes],
+      [gl_cv_header_wchar_h_standalone=no])])
+  if test $gl_cv_header_wchar_h_standalone = yes; then
+    WCHAR_H=
+  else
+    gl_ABSOLUTE_HEADER([wchar.h])
+    ABSOLUTE_WCHAR_H=\"$gl_cv_absolute_wchar_h\"
+    WCHAR_H=wchar.h
+  fi
+  AC_SUBST([ABSOLUTE_WCHAR_H])
+  AC_SUBST([WCHAR_H])
+])