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From "Andrew Stitcher (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (QPID-3295) Under some conditions autoconf incorrectly detects that gcc doesn't support -Werror
Date Tue, 07 Jun 2011 18:49:58 GMT

    [ https://issues.apache.org/jira/browse/QPID-3295?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13045588#comment-13045588

Andrew Stitcher commented on QPID-3295:

Configure.ac uses the gl_COMPILER_FLAGS macro to test whether the compiler accepts a particular
flag. However the program it uses to test compile has an unused variable in it.

The program is:

int main() {
int x;
return 0;

when compiled with -Wall -Werror this program reports an error and so autoconf thinks that
-Werror isn't a valid flags for gcc

> Under some conditions autoconf incorrectly detects that gcc doesn't support -Werror
> -----------------------------------------------------------------------------------
>                 Key: QPID-3295
>                 URL: https://issues.apache.org/jira/browse/QPID-3295
>             Project: Qpid
>          Issue Type: Bug
>    Affects Versions: 0.8, 0.10
>            Reporter: Andrew Stitcher
>            Assignee: Andrew Stitcher
>              Labels: autoconf, gcc
> If CFLAGS or CXXFLAGS contains "-Wall" when running configure, autoconf incorrectly detects
that gcc doesn't support -Werror
> This is problematic because it is an important aspect of our policy that there should
be no compiler warnings, and this bug stops this being enforced.
> Notably, the fedora package build has this issue and has been shipping with some unnoticed
warnings for a while.

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