Bug 108089 – "clang: warning: not using the clang compiler for C++ inputs" due to hard-coding of /usr/bin/clang in WebCore.gyp

• Component: New Bugs
• Status: RESOLVED FIXED

[sideshowbarker]

http://trac.webkit.org/changeset/140925 for bug 107984 changed Source/WebCore/WebCore.gyp/WebCore.gyp so that it now hardcodes "/usr/bin/clang" as an argument for --preprocessor switch that's fed to the part of the build that preprocesses the bindings idl files.

In my OSX 10.6.8 environment, that change causes the build to generate hundreds of "clang: warning: not using the clang compiler for C++ inputs" messages.

Why not just have "clang" there instead of "/usr/bin/clang"? That way you could just have this part of the build using the clang that the rest of the build uses; e.g., if I have my environment set up for building Chromium with clang in $CHROME/src/third_party/llvm-build/Release+Asserts/bin the idl preprocessing would use that clang too.

[Nico Weber]

Install Xcode 4.2 and install the command line tools. Then you should be all set.

[sideshowbarker]

(In reply to comment #1)
> Install Xcode 4.2 and install the command line tools. Then you should be all set.

If Xcode 4.2 is the latest, it's not possible to install it in a OSX 10.6.8. I tried it before and got a message saying as much. Anyway, I'm able to build Chromium fine in my 10.6 without needing Xcode 4.2, and I think it's reasonable to expect that dependencies on Xcode 4.2 shouldn't be introduced unless they're really necessary.

[Tony Chang]

Nico: Maybe I should have OSX use /usr/bin/gcc?  That would actually be more like the Apple Mac build.  When /usr/bin/gcc goes away, we'll have to update both builds.

[Nico Weber]

Fine with me, but I'm not sure how much longer we're going to support buildling with Xcode 3.2.6 anyhow. And I believe Xcode 4.2 includes a capable clang and is available for 10.6 (that's what I have installed on my 10.6 box).

[Tony Chang]

Created attachment 185034 [details]
Patch

[Nico Weber]

lgtm / meh.

[WebKit Review Bot]

Comment on attachment 185034 [details]
Patch

Clearing flags on attachment: 185034

Committed r141007: <http://trac.webkit.org/changeset/141007>

[WebKit Review Bot]

All reviewed patches have been landed.  Closing bug.

[sideshowbarker]

(In reply to comment #4)
> Fine with me, but I'm not sure how much longer we're going to support buildling with Xcode 3.2.6 anyhow. And I believe Xcode 4.2 includes a capable clang and is available for 10.6 (that's what I have installed on my 10.6 box).

Not to beat this into the ground, but I went to https://developer.apple.com/downloads/index.action?name=Xcode to try to download it but the only Xcode 4.2 download there is specifically labeled "Xcode 4.2 for Lion". (The Xcode 4.1 and 4.3 downloads are labeled that way too.) So if you're using it with 10.6, I assume that despite how it's labeled it's actually possible to install it and run it under 10.6, so I'll give it a try.

Also, I get the main point and will make some time soon to get my OS updated to Mountain Lion.

Anyway, thanks for the responses and fix on this bug.