I'm adding comments about a non-trivial idiom in the *.m4 files:
2009-11-22 Bruno Haible <br...@clisp.org>
Add comments.
* m4/dirent_h.m4 (gl_DIRENT_H): Add comment about gl_CHECK_NEXT_HEADERS
invocation.
* m4/iconv_h.m4 (gl_ICONV_H): Likewise.
* m4/spawn_h.m4 (gl_SPAWN_H): Likewise.
* m4/wchar.m4 (gl_WCHAR_H): Likewise.
--- m4/dirent_h.m4.orig 2009-11-23 01:00:06.000000000 +0100
+++ m4/dirent_h.m4 2009-11-23 00:59:09.000000000 +0100
@@ -1,4 +1,4 @@
-# dirent_h.m4 serial 6
+# dirent_h.m4 serial 7
dnl Copyright (C) 2008-2009 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -12,6 +12,8 @@
dnl once only, before all statements that occur in other macros.
AC_REQUIRE([gl_DIRENT_H_DEFAULTS])
+ dnl Execute this unconditionally, because DIRENT_H may be set by other
+ dnl modules, after this code is executed.
gl_CHECK_NEXT_HEADERS([dirent.h])
])
--- m4/iconv_h.m4.orig 2009-11-23 01:00:06.000000000 +0100
+++ m4/iconv_h.m4 2009-11-23 00:59:16.000000000 +0100
@@ -1,5 +1,5 @@
-# iconv_h.m4 serial 4
-dnl Copyright (C) 2007-2008 Free Software Foundation, Inc.
+# iconv_h.m4 serial 5
+dnl Copyright (C) 2007-2009 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.
@@ -7,6 +7,9 @@
AC_DEFUN([gl_ICONV_H],
[
AC_REQUIRE([gl_ICONV_H_DEFAULTS])
+
+ dnl Execute this unconditionally, because ICONV_H may be set by other
+ dnl modules, after this code is executed.
gl_CHECK_NEXT_HEADERS([iconv.h])
])
--- m4/spawn_h.m4.orig 2009-11-23 01:00:06.000000000 +0100
+++ m4/spawn_h.m4 2009-11-23 00:59:26.000000000 +0100
@@ -1,5 +1,5 @@
-# spawn_h.m4 serial 1
-dnl Copyright (C) 2008 Free Software Foundation, Inc.
+# spawn_h.m4 serial 2
+dnl Copyright (C) 2008-2009 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.
@@ -12,6 +12,8 @@
dnl once only, before all statements that occur in other macros.
AC_REQUIRE([gl_SPAWN_H_DEFAULTS])
+ dnl Execute this unconditionally, because SPAWN_H may be set by other
+ dnl modules, after this code is executed.
gl_CHECK_NEXT_HEADERS([spawn.h])
AC_CHECK_HEADERS_ONCE([spawn.h])
--- m4/wchar.m4.orig 2009-11-23 01:00:06.000000000 +0100
+++ m4/wchar.m4 2009-11-23 00:59:44.000000000 +0100
@@ -7,7 +7,7 @@
dnl Written by Eric Blake.
-# wchar.m4 serial 25
+# wchar.m4 serial 26
AC_DEFUN([gl_WCHAR_H],
[
@@ -45,6 +45,8 @@
HAVE_WCHAR_H=0
fi
AC_SUBST([HAVE_WCHAR_H])
+ dnl Execute this unconditionally, because WCHAR_H may be set by other
+ dnl modules, after this code is executed.
gl_CHECK_NEXT_HEADERS([wchar.h])
])
