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AC_BEFORE does not warn when it should
From: |
Bruno Haible |
Subject: |
AC_BEFORE does not warn when it should |
Date: |
Mon, 31 May 2010 23:36:05 +0200 |
User-agent: |
KMail/1.9.9 |
Hi,
Here is a case where AC_BEFORE does not warn when it should.
How to reproduce (with autoconf 2.65):
$ wget http://www.haible.de/bruno/gnu/autoconf-bug-20100601.tar.gz
$ tar xvfz autoconf-bug-20100601.tar.gz
$ cd autoconf-bug-20100601
$ autoconf
No warning. Now look at the definition of gl_LIBUNISTRING
(in file m4/libunistring.m4): It starts with
AC_BEFORE([gl_LIBUNISTRING], [gl_LIBUNISTRING_LIB_PREPARE])
# XXX gl_LIBUNISTRING starts here
And the definition of gl_LIBUNISTRING_LIB_PREPARE (in file
m4/libunistring-base.m4): It starts with
AC_BEFORE([gl_LIBUNISTRING], [gl_LIBUNISTRING_LIB_PREPARE])
# XXX gl_LIBUNISTRING_LIB_PREPARE starts here
Both macros are defined with AC_DEFUN. Neither one requires nor invokes any
other macro. In the final configure file, the "before" constraint is violated:
$ grep -n 'starts here' configure
12110: # XXX gl_LIBUNISTRING_LIB_PREPARE starts here
14551: # XXX gl_LIBUNISTRING starts here
Yet autoconf has not warned. Why??
Bruno
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