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Re: autoconf-2.68: no AC_LANG_SOURCE call detected in body
From: |
Ralf Corsepius |
Subject: |
Re: autoconf-2.68: no AC_LANG_SOURCE call detected in body |
Date: |
Thu, 23 Sep 2010 17:13:32 +0200 |
User-agent: |
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.9) Gecko/20100907 Fedora/3.1.3-1.fc13 Thunderbird/3.1.3 |
On 09/23/2010 04:45 PM, Eric Blake wrote:
On 09/23/2010 08:33 AM, Ralf Corsepius wrote:
Not only were they entirely silent, but most likely generated a broken
configure. If you don't use AC_LANG_SOURCE, then you don't get the
benefit of all the prior AC_DEFINEs being implicitly included before
the body of your test, which leads to documented cases of
mis-diagnosing whether a feature is present for a given build.
Actually, I don't need the AC_DEFINES in this particular case - Adding
them however, should not do much harm, either.
If you truly don't need all the earlier AC_DEFINES for this particular
case, you could use:
AC_COMPILE_IFELSE([AC_LANG_DEFINES_PROVIDED
#ifndef foo
choke me
#endif
])
as an alternative way to silence the warning;
Thanks for the hint.
this is also mentioned in NEWS; but it requires more effort if you
want to be back-compatible to earlier autoconf:
m4_ifndef([AC_LANG_DEFINES_PROVIDED],
[m4_define([AC_LANG_DEFINES_PROVIDED])])
I need to be backward compatible ;)
Well, "really usable warnings" look a bit different than this warning.
They might be self-explanatory to you, but to me this warning was
"Greek".
If you have any suggestions on how to improve this message:
configure.ac:6: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call
detected in body
I wish I had one :)
which told you the exact line number of the problem, as well as called
out the macro name that was in question, and where the documentation
for that macro name:
As I already tried to express, this was a trimmed down excerpt of a
real world configuration, with the real warning being a little more complex:
configure.ac:25: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call
detected in body
../../lib/autoconf/lang.m4:194: AC_LANG_CONFTEST is expanded from...
../../lib/autoconf/general.m4:2591: _AC_COMPILE_IFELSE is expanded from...
../../lib/autoconf/general.m4:2607: AC_COMPILE_IFELSE is expanded from...
../../lib/m4sugar/m4sh.m4:606: AS_IF is expanded from...
../../lib/autoconf/general.m4:2032: AC_CACHE_VAL is expanded from...
../../lib/autoconf/general.m4:2053: AC_CACHE_CHECK is expanded from...
aclocal/check-cpuopts.m4:4: RTEMS_CHECK_CPUOPTS is expanded from...
configure.ac:25: the top level
configure.ac:26: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call
detected in body
../../lib/autoconf/lang.m4:194: AC_LANG_CONFTEST is expanded from...
../../lib/autoconf/general.m4:2591: _AC_COMPILE_IFELSE is expanded from...
../../lib/autoconf/general.m4:2607: AC_COMPILE_IFELSE is expanded from...
../../lib/m4sugar/m4sh.m4:606: AS_IF is expanded from...
../../lib/autoconf/general.m4:2032: AC_CACHE_VAL is expanded from...
../../lib/autoconf/general.m4:2053: AC_CACHE_CHECK is expanded from...
aclocal/check-cpuopts.m4:4: RTEMS_CHECK_CPUOPTS is expanded from...
configure.ac:26: the top level
configure.ac:27: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call
detected in body
../../lib/autoconf/lang.m4:194: AC_LANG_CONFTEST is expanded from...
../../lib/autoconf/general.m4:2591: _AC_COMPILE_IFELSE is expanded from...
../../lib/autoconf/general.m4:2607: AC_COMPILE_IFELSE is expanded from...
../../lib/m4sugar/m4sh.m4:606: AS_IF is expanded from...
../../lib/autoconf/general.m4:2032: AC_CACHE_VAL is expanded from...
../../lib/autoconf/general.m4:2053: AC_CACHE_CHECK is expanded from...
aclocal/check-cpuopts.m4:4: RTEMS_CHECK_CPUOPTS is expanded from...
configure.ac:27: the top level
configure.ac:25: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call
detected in body
../../lib/autoconf/lang.m4:194: AC_LANG_CONFTEST is expanded from...
../../lib/autoconf/general.m4:2591: _AC_COMPILE_IFELSE is expanded from...
../../lib/autoconf/general.m4:2607: AC_COMPILE_IFELSE is expanded from...
../../lib/m4sugar/m4sh.m4:606: AS_IF is expanded from...
../../lib/autoconf/general.m4:2032: AC_CACHE_VAL is expanded from...
../../lib/autoconf/general.m4:2053: AC_CACHE_CHECK is expanded from...
aclocal/check-cpuopts.m4:4: RTEMS_CHECK_CPUOPTS is expanded from...
configure.ac:25: the top level
configure.ac:26: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call
detected in body
../../lib/autoconf/lang.m4:194: AC_LANG_CONFTEST is expanded from...
../../lib/autoconf/general.m4:2591: _AC_COMPILE_IFELSE is expanded from...
../../lib/autoconf/general.m4:2607: AC_COMPILE_IFELSE is expanded from...
../../lib/m4sugar/m4sh.m4:606: AS_IF is expanded from...
../../lib/autoconf/general.m4:2032: AC_CACHE_VAL is expanded from...
../../lib/autoconf/general.m4:2053: AC_CACHE_CHECK is expanded from...
aclocal/check-cpuopts.m4:4: RTEMS_CHECK_CPUOPTS is expanded from...
configure.ac:26: the top level
configure.ac:27: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call
detected in body
../../lib/autoconf/lang.m4:194: AC_LANG_CONFTEST is expanded from...
../../lib/autoconf/general.m4:2591: _AC_COMPILE_IFELSE is expanded from...
../../lib/autoconf/general.m4:2607: AC_COMPILE_IFELSE is expanded from...
../../lib/m4sugar/m4sh.m4:606: AS_IF is expanded from...
../../lib/autoconf/general.m4:2032: AC_CACHE_VAL is expanded from...
../../lib/autoconf/general.m4:2053: AC_CACHE_CHECK is expanded from...
aclocal/check-cpuopts.m4:4: RTEMS_CHECK_CPUOPTS is expanded from...
configure.ac:27: the top level
configure.ac:27: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call
detected in body
../../lib/autoconf/lang.m4:194: AC_LANG_CONFTEST is expanded from...
../../lib/autoconf/general.m4:2591: _AC_COMPILE_IFELSE is expanded from...
../../lib/autoconf/general.m4:2607: AC_COMPILE_IFELSE is expanded from...
../../lib/m4sugar/m4sh.m4:606: AS_IF is expanded from...
../../lib/autoconf/general.m4:2032: AC_CACHE_VAL is expanded from...
../../lib/autoconf/general.m4:2053: AC_CACHE_CHECK is expanded from...
../aclocal/check-cpuopts.m4:4: RTEMS_CHECK_CPUOPTS is expanded from...
configure.ac:27: the top level
configure.ac:29: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call
detected in body
../../lib/autoconf/lang.m4:194: AC_LANG_CONFTEST is expanded from...
../../lib/autoconf/general.m4:2591: _AC_COMPILE_IFELSE is expanded from...
../../lib/autoconf/general.m4:2607: AC_COMPILE_IFELSE is expanded from...
../../lib/m4sugar/m4sh.m4:606: AS_IF is expanded from...
../../lib/autoconf/general.m4:2032: AC_CACHE_VAL is expanded from...
../../lib/autoconf/general.m4:2053: AC_CACHE_CHECK is expanded from...
../aclocal/check-cpuopts.m4:4: RTEMS_CHECK_CPUOPTS is expanded from...
configure.ac:29: the top level
configure.ac:27: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call
detected in body
../../lib/autoconf/lang.m4:194: AC_LANG_CONFTEST is expanded from...
../../lib/autoconf/general.m4:2591: _AC_COMPILE_IFELSE is expanded from...
../../lib/autoconf/general.m4:2607: AC_COMPILE_IFELSE is expanded from...
../../lib/m4sugar/m4sh.m4:606: AS_IF is expanded from...
../../lib/autoconf/general.m4:2032: AC_CACHE_VAL is expanded from...
../../lib/autoconf/general.m4:2053: AC_CACHE_CHECK is expanded from...
../aclocal/check-cpuopts.m4:4: RTEMS_CHECK_CPUOPTS is expanded from...
configure.ac:27: the top level
configure.ac:29: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call
detected in body
../../lib/autoconf/lang.m4:194: AC_LANG_CONFTEST is expanded from...
../../lib/autoconf/general.m4:2591: _AC_COMPILE_IFELSE is expanded from...
../../lib/autoconf/general.m4:2607: AC_COMPILE_IFELSE is expanded from...
../../lib/m4sugar/m4sh.m4:606: AS_IF is expanded from...
../../lib/autoconf/general.m4:2032: AC_CACHE_VAL is expanded from...
../../lib/autoconf/general.m4:2053: AC_CACHE_CHECK is expanded from...
../aclocal/check-cpuopts.m4:4: RTEMS_CHECK_CPUOPTS is expanded from...
configure.ac:29: the top level
configure.ac:27: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call
detected in body
../../lib/autoconf/lang.m4:194: AC_LANG_CONFTEST is expanded from...
../../lib/autoconf/general.m4:2591: _AC_COMPILE_IFELSE is expanded from...
../../lib/autoconf/general.m4:2607: AC_COMPILE_IFELSE is expanded from...
../../lib/m4sugar/m4sh.m4:606: AS_IF is expanded from...
../../lib/autoconf/general.m4:2032: AC_CACHE_VAL is expanded from...
../../lib/autoconf/general.m4:2053: AC_CACHE_CHECK is expanded from...
../aclocal/check-cpuopts.m4:4: RTEMS_CHECK_CPUOPTS is expanded from...
configure.ac:27: the top level
configure.ac:29: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call
detected in body
../../lib/autoconf/lang.m4:194: AC_LANG_CONFTEST is expanded from...
../../lib/autoconf/general.m4:2591: _AC_COMPILE_IFELSE is expanded from...
../../lib/autoconf/general.m4:2607: AC_COMPILE_IFELSE is expanded from...
../../lib/m4sugar/m4sh.m4:606: AS_IF is expanded from...
../../lib/autoconf/general.m4:2032: AC_CACHE_VAL is expanded from...
../../lib/autoconf/general.m4:2053: AC_CACHE_CHECK is expanded from...
../aclocal/check-cpuopts.m4:4: RTEMS_CHECK_CPUOPTS is expanded from...
configure.ac:29: the top level
configure.ac:27: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call
detected in body
../../lib/autoconf/lang.m4:194: AC_LANG_CONFTEST is expanded from...
../../lib/autoconf/general.m4:2591: _AC_COMPILE_IFELSE is expanded from...
../../lib/autoconf/general.m4:2607: AC_COMPILE_IFELSE is expanded from...
../../lib/m4sugar/m4sh.m4:606: AS_IF is expanded from...
../../lib/autoconf/general.m4:2032: AC_CACHE_VAL is expanded from...
../../lib/autoconf/general.m4:2053: AC_CACHE_CHECK is expanded from...
../aclocal/check-cpuopts.m4:4: RTEMS_CHECK_CPUOPTS is expanded from...
configure.ac:27: the top level
configure.ac:29: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call
detected in body
../../lib/autoconf/lang.m4:194: AC_LANG_CONFTEST is expanded from...
../../lib/autoconf/general.m4:2591: _AC_COMPILE_IFELSE is expanded from...
../../lib/autoconf/general.m4:2607: AC_COMPILE_IFELSE is expanded from...
../../lib/m4sugar/m4sh.m4:606: AS_IF is expanded from...
../../lib/autoconf/general.m4:2032: AC_CACHE_VAL is expanded from...
../../lib/autoconf/general.m4:2053: AC_CACHE_CHECK is expanded from...
../aclocal/check-cpuopts.m4:4: RTEMS_CHECK_CPUOPTS is expanded from...
configure.ac:29: the top level
configure.ac:27: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call
detected in body
../../lib/autoconf/lang.m4:194: AC_LANG_CONFTEST is expanded from...
../../lib/autoconf/general.m4:2591: _AC_COMPILE_IFELSE is expanded from...
../../lib/autoconf/general.m4:2607: AC_COMPILE_IFELSE is expanded from...
../../lib/m4sugar/m4sh.m4:606: AS_IF is expanded from...
../../lib/autoconf/general.m4:2032: AC_CACHE_VAL is expanded from...
../../lib/autoconf/general.m4:2053: AC_CACHE_CHECK is expanded from...
../aclocal/check-cpuopts.m4:4: RTEMS_CHECK_CPUOPTS is expanded from...
configure.ac:27: the top level
configure.ac:27: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call
detected in body
../../lib/autoconf/lang.m4:194: AC_LANG_CONFTEST is expanded from...
../../lib/autoconf/general.m4:2591: _AC_COMPILE_IFELSE is expanded from...
../../lib/autoconf/general.m4:2607: AC_COMPILE_IFELSE is expanded from...
../../lib/m4sugar/m4sh.m4:606: AS_IF is expanded from...
../../lib/autoconf/general.m4:2032: AC_CACHE_VAL is expanded from...
../../lib/autoconf/general.m4:2053: AC_CACHE_CHECK is expanded from...
../aclocal/check-cpuopts.m4:4: RTEMS_CHECK_CPUOPTS is expanded from...
configure.ac:27: the top level
configure.ac:27: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call
detected in body
../../lib/autoconf/lang.m4:194: AC_LANG_CONFTEST is expanded from...
../../lib/autoconf/general.m4:2591: _AC_COMPILE_IFELSE is expanded from...
../../lib/autoconf/general.m4:2607: AC_COMPILE_IFELSE is expanded from...
../../lib/m4sugar/m4sh.m4:606: AS_IF is expanded from...
../../lib/autoconf/general.m4:2032: AC_CACHE_VAL is expanded from...
../../lib/autoconf/general.m4:2053: AC_CACHE_CHECK is expanded from...
../aclocal/check-cpuopts.m4:4: RTEMS_CHECK_CPUOPTS is expanded from...
configure.ac:27: the top level
configure.ac:27: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call
detected in body
../../lib/autoconf/lang.m4:194: AC_LANG_CONFTEST is expanded from...
../../lib/autoconf/general.m4:2591: _AC_COMPILE_IFELSE is expanded from...
../../lib/autoconf/general.m4:2607: AC_COMPILE_IFELSE is expanded from...
../../lib/m4sugar/m4sh.m4:606: AS_IF is expanded from...
../../lib/autoconf/general.m4:2032: AC_CACHE_VAL is expanded from...
../../lib/autoconf/general.m4:2053: AC_CACHE_CHECK is expanded from...
../aclocal/check-cpuopts.m4:4: RTEMS_CHECK_CPUOPTS is expanded from...
configure.ac:27: the top level
configure.ac:25: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call
detected in body
../../lib/autoconf/lang.m4:194: AC_LANG_CONFTEST is expanded from...
../../lib/autoconf/general.m4:2591: _AC_COMPILE_IFELSE is expanded from...
../../lib/autoconf/general.m4:2607: AC_COMPILE_IFELSE is expanded from...
../../lib/m4sugar/m4sh.m4:606: AS_IF is expanded from...
../../lib/autoconf/general.m4:2032: AC_CACHE_VAL is expanded from...
../../lib/autoconf/general.m4:2053: AC_CACHE_CHECK is expanded from...
../aclocal/check-cpuopts.m4:4: RTEMS_CHECK_CPUOPTS is expanded from...
configure.ac:25: the top level
configure.ac:25: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call
detected in body
../../lib/autoconf/lang.m4:194: AC_LANG_CONFTEST is expanded from...
../../lib/autoconf/general.m4:2591: _AC_COMPILE_IFELSE is expanded from...
../../lib/autoconf/general.m4:2607: AC_COMPILE_IFELSE is expanded from...
../../lib/m4sugar/m4sh.m4:606: AS_IF is expanded from...
../../lib/autoconf/general.m4:2032: AC_CACHE_VAL is expanded from...
../../lib/autoconf/general.m4:2053: AC_CACHE_CHECK is expanded from...
../aclocal/check-cpuopts.m4:4: RTEMS_CHECK_CPUOPTS is expanded from...
configure.ac:25: the top level
configure.ac:25: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call
detected in body
../../lib/autoconf/lang.m4:194: AC_LANG_CONFTEST is expanded from...
../../lib/autoconf/general.m4:2591: _AC_COMPILE_IFELSE is expanded from...
../../lib/autoconf/general.m4:2607: AC_COMPILE_IFELSE is expanded from...
../../lib/m4sugar/m4sh.m4:606: AS_IF is expanded from...
../../lib/autoconf/general.m4:2032: AC_CACHE_VAL is expanded from...
../../lib/autoconf/general.m4:2053: AC_CACHE_CHECK is expanded from...
../aclocal/check-cpuopts.m4:4: RTEMS_CHECK_CPUOPTS is expanded from...
configure.ac:25: the top level
configure.ac:25: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call
detected in body
../../lib/autoconf/lang.m4:194: AC_LANG_CONFTEST is expanded from...
../../lib/autoconf/general.m4:2591: _AC_COMPILE_IFELSE is expanded from...
../../lib/autoconf/general.m4:2607: AC_COMPILE_IFELSE is expanded from...
../../lib/m4sugar/m4sh.m4:606: AS_IF is expanded from...
../../lib/autoconf/general.m4:2032: AC_CACHE_VAL is expanded from...
../../lib/autoconf/general.m4:2053: AC_CACHE_CHECK is expanded from...
../aclocal/check-cpuopts.m4:4: RTEMS_CHECK_CPUOPTS is expanded from...
configure.ac:25: the top level
configure.ac:25: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call
detected in body
../../lib/autoconf/lang.m4:194: AC_LANG_CONFTEST is expanded from...
../../lib/autoconf/general.m4:2591: _AC_COMPILE_IFELSE is expanded from...
../../lib/autoconf/general.m4:2607: AC_COMPILE_IFELSE is expanded from...
../../lib/m4sugar/m4sh.m4:606: AS_IF is expanded from...
../../lib/autoconf/general.m4:2032: AC_CACHE_VAL is expanded from...
../../lib/autoconf/general.m4:2053: AC_CACHE_CHECK is expanded from...
aclocal/check-cpuopts.m4:4: RTEMS_CHECK_CPUOPTS is expanded from...
configure.ac:25: the top level
configure.ac:26: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call
detected in body
../../lib/autoconf/lang.m4:194: AC_LANG_CONFTEST is expanded from...
../../lib/autoconf/general.m4:2591: _AC_COMPILE_IFELSE is expanded from...
../../lib/autoconf/general.m4:2607: AC_COMPILE_IFELSE is expanded from...
../../lib/m4sugar/m4sh.m4:606: AS_IF is expanded from...
../../lib/autoconf/general.m4:2032: AC_CACHE_VAL is expanded from...
../../lib/autoconf/general.m4:2053: AC_CACHE_CHECK is expanded from...
aclocal/check-cpuopts.m4:4: RTEMS_CHECK_CPUOPTS is expanded from...
configure.ac:26: the top level
configure.ac:27: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call
detected in body
../../lib/autoconf/lang.m4:194: AC_LANG_CONFTEST is expanded from...
../../lib/autoconf/general.m4:2591: _AC_COMPILE_IFELSE is expanded from...
../../lib/autoconf/general.m4:2607: AC_COMPILE_IFELSE is expanded from...
../../lib/m4sugar/m4sh.m4:606: AS_IF is expanded from...
../../lib/autoconf/general.m4:2032: AC_CACHE_VAL is expanded from...
../../lib/autoconf/general.m4:2053: AC_CACHE_CHECK is expanded from...
aclocal/check-cpuopts.m4:4: RTEMS_CHECK_CPUOPTS is expanded from...
configure.ac:27: the top level
configure.ac:25: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call
detected in body
../../lib/autoconf/lang.m4:194: AC_LANG_CONFTEST is expanded from...
../../lib/autoconf/general.m4:2591: _AC_COMPILE_IFELSE is expanded from...
../../lib/autoconf/general.m4:2607: AC_COMPILE_IFELSE is expanded from...
../../lib/m4sugar/m4sh.m4:606: AS_IF is expanded from...
../../lib/autoconf/general.m4:2032: AC_CACHE_VAL is expanded from...
../../lib/autoconf/general.m4:2053: AC_CACHE_CHECK is expanded from...
aclocal/check-cpuopts.m4:4: RTEMS_CHECK_CPUOPTS is expanded from...
configure.ac:25: the top level
configure.ac:26: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call
detected in body
../../lib/autoconf/lang.m4:194: AC_LANG_CONFTEST is expanded from...
../../lib/autoconf/general.m4:2591: _AC_COMPILE_IFELSE is expanded from...
../../lib/autoconf/general.m4:2607: AC_COMPILE_IFELSE is expanded from...
../../lib/m4sugar/m4sh.m4:606: AS_IF is expanded from...
../../lib/autoconf/general.m4:2032: AC_CACHE_VAL is expanded from...
../../lib/autoconf/general.m4:2053: AC_CACHE_CHECK is expanded from...
aclocal/check-cpuopts.m4:4: RTEMS_CHECK_CPUOPTS is expanded from...
configure.ac:26: the top level
configure.ac:27: warning: AC_LANG_CONFTEST: no AC_LANG_SOURCE call
detected in body
../../lib/autoconf/lang.m4:194: AC_LANG_CONFTEST is expanded from...
../../lib/autoconf/general.m4:2591: _AC_COMPILE_IFELSE is expanded from...
../../lib/autoconf/general.m4:2607: AC_COMPILE_IFELSE is expanded from...
../../lib/m4sugar/m4sh.m4:606: AS_IF is expanded from...
../../lib/autoconf/general.m4:2032: AC_CACHE_VAL is expanded from...
../../lib/autoconf/general.m4:2053: AC_CACHE_CHECK is expanded from...
aclocal/check-cpuopts.m4:4: RTEMS_CHECK_CPUOPTS is expanded from...
configure.ac:27: the top level
... with the bug actually being in a macro in aclocal/check-cpuopts.m4
Isolating the excerpt wasn't really difficult, but wasn't trivial, either :)
Ralf