[BOLT] Enable clang-bolt for host-gcc-built Clang

[Amir]

Summary

Follow-up to D136410 and D137357.

[gkistanova]

Thanks, Amir.

The patch itself looks good.

The bolt-worker seems overloaded, though. It hosts 6 builders, only one build is allowed at any given moment of time. The current waiting queue for each builder is about 2 hours, even if builds themselves are fast. Adding one more builder to the same worker will make it worse.

[Amir]

In D137678#3925207, @gkistanova wrote:

Thanks, Amir.

The patch itself looks good.

The bolt-worker seems overloaded, though. It hosts 6 builders, only one build is allowed at any given moment of time. The current waiting queue for each builder is about 2 hours, even if builds themselves are fast. Adding one more builder to the same worker will make it worse.

bolt-x86_64-ubuntu is going away, but I agree that waiting time is quite high now, largely driven by msvc-wine builder. We'll discuss within the team if we want to keep it.

[gkistanova]

LGTM.

[Amir]

Don't collapse requests, run check-clang

[Amir]

Remove unrelated changes

[gkistanova]

Thanks, Amir!

buildbot/osuosl/master/config/builders.py

# Builders for ML-driven compiler optimizations.
     'collapseRequests': False,
     'workernames' : ['bolt-worker'],
     'builddir': "bolt-x86_64-ubuntu-nfc",
     'factory' : AnnotatedBuilder.getAnnotatedBuildFactory(
                     script="bolt-nfc.py",
                     depends_on_projects=['llvm', 'bolt'],
                     )},
 
+    {'name': "bolt-x86_64-ubuntu-clang-bolt-gcc",
+    'tags': ["bolt"],
+    'collapseRequests': False,
+    'workernames':["bolt-worker"],
+    'builddir': "bolt-x86_64-ubuntu-clang-bolt-gcc",
+    'factory' : BOLTBuilder.getBOLTCmakeBuildFactory(
+                    bolttests=False,
+                    depends_on_projects=['bolt', 'clang', 'llvm'],
+                    cache='clang/cmake/caches/BOLT.cmake',
+                    targets=['clang++-bolt'],
+                    extra_configure_args=[
+                        "-DCMAKE_C_COMPILER=gcc",
+                        "-DCMAKE_CXX_COMPILER=g++",
+                        "-DLLVM_APPEND_VC_REV=OFF",
+                        "-DLLVM_CCACHE_BUILD=ON",
+                        ],
+                    )},
+
     {'name': "bolt-x86_64-ubuntu-clang-bolt-lto-pgo",
     'tags': ["bolt"],
     'collapseRequests': False,
     'workernames':["bolt-worker"],
     'builddir': "bolt-x86_64-ubuntu-clang-bolt-lto-pgo",
     'factory' : BOLTBuilder.getBOLTCmakeBuildFactory(
                     bolttests=False,
                     depends_on_projects=['bolt', 'clang', 'lld', 'llvm'],