-# absolute-header.m4 serial 7
-dnl Copyright (C) 2006, 2007 Free Software Foundation, Inc.
+# absolute-header.m4 serial 9
+dnl Copyright (C) 2006-2008 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.
# The three "///" are to pacify Sun C 5.8, which otherwise would say
# "warning: #include of /usr/include/... may be non-portable".
# Use `""', not `<>', so that the /// cannot be confused with a C99 comment.
+# Note: This macro assumes that the header file is not empty after
+# preprocessing, i.e. it does not only define preprocessor macros but also
+# provides some type/enum definitions or function/variable declarations.
AC_DEFUN([gl_ABSOLUTE_HEADER],
[AC_LANG_PREPROC_REQUIRE()dnl
-AC_FOREACH([gl_HEADER_NAME], [$1],
+m4_foreach_w([gl_HEADER_NAME], [$1],
[AS_VAR_PUSHDEF([gl_absolute_header],
[gl_cv_absolute_]m4_quote(m4_defn([gl_HEADER_NAME])))dnl
AC_CACHE_CHECK([absolute name of <]m4_quote(m4_defn([gl_HEADER_NAME]))[>],