[webkit-dev] Build errors with GCC < 4.7.3 after SVN r167943

[Mario Sanchez Prada]

Hi all,

I encountered today while trying to build WebKitGTK+ in my old Ubuntu 12.10 box: my compilation failed at Source/WebCore/Modules/webdatabase/SQLCallbackWrapper.h:79:91 with the following error:

    error: expression '<erroneous-expression> = <erroneous-expression>' is not a constant-expression

The offending snippet of code is as follows, introduced two days ago in SVN r167943 [1]:

        scriptExecutionContextPtr->postTask({ ScriptExecutionContext::Task::CleanupTask, [=] (ScriptExecutionContext* context) {
            ASSERT_UNUSED(context, context == scriptExecutionContextPtr && context->isContextThread());
            callback->deref();
            scriptExecutionContextPtr->deref();
        } });

After some investigation I found it to be a bug in GCC 4.7.2 (the version shipped in Ubuntu  Quantal), which are fixd now both GCC 4.7.3 and GCC 4.8:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54947

So, just sending this email here to let you know about this, in case you run into the same issue.

Thanks,
Mario

[1] http://trac.webkit.org/changeset/167943