1 files changed, 32 insertions, 7 deletions

diff --git a/gl/m4/wchar.m4 b/gl/m4/wchar.m4
index 068f22d3..70b1248f 100644
--- a/gl/m4/wchar.m4
+++ b/gl/m4/wchar.m4
@@ -7,23 +7,48 @@ dnl with or without modifications, as long as this notice is preserved.
 
 dnl Written by Eric Blake.
 
-# wchar.m4 serial 1
+# wchar.m4 serial 4
 
 AC_DEFUN([gl_WCHAR_H],
 [
+  AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
   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\"
+  if test $gl_cv_header_wchar_h_standalone != yes; then
     WCHAR_H=wchar.h
   fi
-  AC_SUBST([ABSOLUTE_WCHAR_H])
+
+  dnl Prepare for creating substitute <wchar.h>.
+  dnl Do it always: WCHAR_H may be empty here but can be set later.
+  dnl Check for <wchar.h> (missing in Linux uClibc when built without wide
+  dnl character support).
+  AC_CHECK_HEADERS_ONCE([wchar.h])
+  if test $ac_cv_header_wchar_h = yes; then
+    HAVE_WCHAR_H=1
+  else
+    HAVE_WCHAR_H=0
+  fi
+  AC_SUBST([HAVE_WCHAR_H])
+  gl_CHECK_NEXT_HEADERS([wchar.h])
+])
+
+AC_DEFUN([gl_WCHAR_MODULE_INDICATOR],
+[
+  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
+  AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
+  GNULIB_[]m4_translit([$1],[abcdefghijklmnopqrstuvwxyz./-],[ABCDEFGHIJKLMNOPQRSTUVWXYZ___])=1
+])
+
+AC_DEFUN([gl_WCHAR_H_DEFAULTS],
+[
+  GNULIB_WCWIDTH=0; AC_SUBST([GNULIB_WCWIDTH])
+  dnl Assume proper GNU behavior unless another module says otherwise.
+  HAVE_DECL_WCWIDTH=1; AC_SUBST([HAVE_DECL_WCWIDTH])
+  REPLACE_WCWIDTH=0;   AC_SUBST([REPLACE_WCWIDTH])
+  WCHAR_H=
   AC_SUBST([WCHAR_H])
 ])