GNU bug report logs - #12142
automake tries to compile a program when 'foo' and 'foo.cxx' exist (though the former is header)

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Karl Berry <karl <at> freefriends.org>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#12142: closed (automake tries to compile a program when 'foo'
 and 'foo.cxx' exist (though the former is header))
Date: Mon, 31 Aug 2020 21:15:02 +0000

[Message part 1 (text/plain, inline)]

Your message dated Mon, 31 Aug 2020 15:14:31 -0600
with message-id <202008312114.07VLEVEh010413 <at> freefriends.org>
and subject line Re: bug#12142: automake tries to compile a program when 'foo' and 'foo.cxx' exist (though the former is header)
has caused the debbugs.gnu.org bug report #12142,
regarding automake tries to compile a program when 'foo' and 'foo.cxx' exist (though the former is header)
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


-- 
12142: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=12142
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Michał Górny <mgorny <at> gentoo.org>
To: bug-automake <at> gnu.org
Subject: automake tries to compile a program when 'foo' and 'foo.cxx' exist
	(though the former is header)
Date: Sun, 5 Aug 2012 11:45:51 +0200

[Message part 3 (text/plain, inline)]

autoconf: 2.69
automake: 1.12.2
libtool: 2.4.2

Hello,

I was writing a C++ library and I think I hit a pretty ugly bug within
automake. My library was structured like the following:

- src/foo (the header file),
- src/foo.cxx (the code).

These files assemble a library, let's call it libfoo.la.

The problem is that every time I modify src/foo.cxx and call 'make',
automake first (correctly) compiles the library, and then mistakenly
tries to compile and link it into a program src/foo, either effectively
overwriting or removing my header file, or failing early due to
missing dependency file.

What's interesting, 'make' calls not following src/foo.cxx changes work
correctly; just the one after modifying src/foo.cxx fails.

Here are the minimal configure.ac & Makefile.am files with which I can
reproduce the issue:


configure.ac:

AC_PREREQ([2.60])
AC_INIT([foo], [0])
AM_INIT_AUTOMAKE([1.6 foreign])

AC_PROG_CXX
LT_INIT

AC_CONFIG_HEADERS([config.h])
AC_CONFIG_FILES([Makefile])
AC_OUTPUT


Makefile.am:

include_HEADERS = src/foo
lib_LTLIBRARIES = libfoo.la

libfoo_la_SOURCES = src/foo.cxx


I've also prepared a git repository with the simple test case:

git clone https://bitbucket.org/mgorny/automake-cxx-bug.git
cd automake-cxx-bug
autoreconf -vi
./configure --disable-static
make # compiles fine
touch src/foo.cxx
make # fails


Related Gentoo bug report:
https://bugs.gentoo.org/show_bug.cgi?id=429972

-- 
Best regards,
Michał Górny

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[Message part 5 (message/rfc822, inline)]

From: Karl Berry <karl <at> freefriends.org>
To: 12142 <at> debbugs.gnu.org
Subject: Re: bug#12142: automake tries to compile a program when 'foo' and
 'foo.cxx' exist (though the former is header)
Date: Mon, 31 Aug 2020 15:14:31 -0600

It seems there is nothing left unresolved here, so closing ...

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