Bug 185461 – [GTK][JHBuild] LLVM 3.7.0 build is broken with GCC 8.1

• Status: RESOLVED
• Resolution: FIXED
• Component: WebKitGTK

[Carlos Bentzen]

While building LLVM 3.7.0 from JHBuild with GCC 8.1 we get a simple casting error:

/home/cadubentzen/Downloads/llvm-3.7.0.src/include/llvm/IR/ValueMap.h:102:31: error: cannot convert ‘const std::unique_ptr<llvm::DenseMap<const llvm::Metadata*, llvm::TrackingMDRef> >’ to ‘bool’ in return
   bool hasMD() const { return MDMap; }

I see two options:
- Add a patch with the explicit cast in JHBuild, pretty easy and no impact in other places;
- Raise LLVM to 3.9.0 (release that had it fixed first, which was in LLVV's SVN at r265828).

I tested that the first solution works and no errors occur in other places during compilation.

But if it's desirable to have a higher LLVM version, we can raise it to 3.9.0.

[Carlos Bentzen]

Created attachment 339918 [details]
Patch for second option

Patch for second option. LLVM 3.9.0 was the first release to drop autotools and uses only CMake. Needs ChangeLog entries.

[Carlos Bentzen]

Created attachment 339921 [details]
Patch for first option

Patch for first option. Needs ChangeLog entries yet as well.

[Michael Catanzaro]

Second option seems somewhat nicer.

I would jump straight to LLVM 6. We can see if test results break after we land it. I'd assume probably not.

[Carlos Bentzen]

Created attachment 339931 [details]
Patch

[Carlos Bentzen]

(In reply to Michael Catanzaro from comment #3)
> Second option seems somewhat nicer.
> 
> I would jump straight to LLVM 6. We can see if test results break after we
> land it. I'd assume probably not.

LLVM 6 removed some APIs that broke Mesa 17.3.3, so I also raised Mesa to 18.0.3 and now it works.

Any objections on raising Mesa version as well? I wonder if this will break any layout tests.

[EWS Watchlist]

Comment on attachment 339931 [details]
Patch

Attachment 339931 [details] did not pass mac-wk2-ews (mac-wk2):
Output: http://webkit-queues.webkit.org/results/7620484

New failing tests:
http/tests/security/XFrameOptions/x-frame-options-deny-multiple-clients.html

[EWS Watchlist]

Created attachment 339935 [details]
Archive of layout-test-results from ews107 for mac-sierra-wk2

The attached test failures were seen while running run-webkit-tests on the mac-wk2-ews.
Bot: ews107  Port: mac-sierra-wk2  Platform: Mac OS X 10.12.6

[Michael Catanzaro]

Comment on attachment 339931 [details]
Patch

Let's try it and see what happens to the bots. It could very well break tests, but only one way to find out.

[EWS Watchlist]

Comment on attachment 339931 [details]
Patch

Rejecting attachment 339931 [details] from commit-queue.

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[Carlos Bentzen]

(In reply to Build Bot from comment #6)
> Comment on attachment 339931 [details]
> Patch
> 
> Attachment 339931 [details] did not pass mac-wk2-ews (mac-wk2):
> Output: http://webkit-queues.webkit.org/results/7620484
> 
> New failing tests:
> http/tests/security/XFrameOptions/x-frame-options-deny-multiple-clients.html

mcatanzaro, can you land the patch? This regression certainly isn't related to the patch and seems like a flaky test on the mac-wk2 bot.

[Michael Catanzaro]

Comment on attachment 339931 [details]
Patch

Yeah, our EWS doesn't run tests, so the bots won't notice any test regressions until after it lands.

[WebKit Commit Bot]

Comment on attachment 339931 [details]
Patch

Clearing flags on attachment: 339931

Committed r231569: <https://trac.webkit.org/changeset/231569>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.