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Re: confdefs.h not being included by AC_LANG_SOURCE()

From: Brian J. Murrell
Subject: Re: confdefs.h not being included by AC_LANG_SOURCE()
Date: Mon, 01 Mar 2010 17:03:26 -0500

On Sun, 2010-02-28 at 10:25 +0100, Ralf Wildenhues wrote: 
> * Ralf Wildenhues wrote on Sat, Feb 20, 2010 at 10:57:04AM CET:
> > * Brian J. Murrell wrote on Thu, Feb 18, 2010 at 07:15:08PM CET:
> > > I am finding that the use of AC_LANG_SOURCE() is having different
> > > results on autoconf 2.64 vs. 2.59.  On 2.59 it seems to have been
> > > including confdefs.h into generate programs but in 2.64 this seems to no
> > > longer be the case.
> > 
> > Looks like a regression to me, from v2.63-153-g8e27cc7.
> Wait a moment.  I can't reproduce this.

Oh?  That's good news, I guess.  :-)

I'm trying to build the smallest reproduction case I can and
unfortunately am running up against my autoconf ignorance.

I have a small test so far.  It's certainly not complete but I am trying
to build it up gradually so as to include only what I need to reproduce
the problem:

AC_INIT([pkg], [1.0])

[m4_ifvaln([$1], [LB_LINUX_CONFTEST([$1])])dnl
rm -f build/conftest.o build/conftest.mod.c build/conftest.ko
AS_IF([AC_TRY_COMMAND(cp conftest.c build && make -d [$2] ${LD:+"LD=$LD"} 
's/ppc.*/powerpc/' -e 's/x86_64/x86/' -e 's/i.86/x86/'`/include 
-I$LINUX/include -I$LINUX_OBJ/include -I$LINUX_OBJ/include2 -include 
include/linux/autoconf.h" -o tmp_include_depends -o scripts -o 
include/config/MARKER -C $LINUX_OBJ 
EXTRA_CFLAGS="-Werror-implicit-function-declaration $EXTRA_KCFLAGS" $ARCH_UM 
$MODULE_TARGET=$PWD/build) >/dev/null && AC_TRY_COMMAND([$3])],
rm -f build/conftest.o build/conftest.mod.c build/conftest.mod.o 
build/conftest.ko m4_ifval([$1], [build/conftest.c conftest.c])[]dnl

LB_LINUX_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <linux/thread_info.h>
        #if THREAD_SIZE < 8192
        #error "stack size < 8192"
]],[],[echo foo])])

As you can see it's similar to your test case but when I try to autoconf
it I get:

$ autoconf error: possibly undefined macro: AC_LANG_SOURCE
      If this token and others are legitimate, please use m4_pattern_allow.
      See the Autoconf documentation.

Your test case autoconf's just fine.

Any idea what the problem is here?


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