Add new linux worker and a legacy linux gcc build that we do internally

[dyung]

Summary

This change adds a new linux worker and adds a build configuration that matches one we run internally. Our internal buildbot was setup a while ago on Ubuntu 18 which contains GCC 7.5 which is still supported, but due to it's age, sometimes does fail, so it would be good to have a public buildbot which mirrors our internal buildbot configuration so that these problems can be found more quickly.

[gkistanova]

Thanks, Douglas!

The patch itself looks good.

Could you re-phrase the title and the description, please? Explaining the purpose of the new build configuration without referencing “ our internal build bot”, which people are not necessarily familiar, will be great.

[dyung]

In D137405#3915628, @gkistanova wrote:

Thanks, Douglas!

The patch itself looks good.

Could you re-phrase the title and the description, please? Explaining the purpose of the new build configuration without referencing “ our internal build bot”, which people are not necessarily familiar, will be great.

Thanks, I've updated the title and description so hopefully it is a better now, but let me know if it could still be clarified further!

[gkistanova]

LGTM.

buildbot/osuosl/master/config/builders.py

'factory': UnifiedTreeBuilder.getCmakeWithNinjaBuildFactory(
                         "-DLLDB_ENABLE_PYTHON=TRUE",
                         "-DLLVM_CCACHE_BUILD=ON",
                         "-DLLVM_INCLUDE_EXAMPLES=OFF",
                         "-DLLVM_ENABLE_ASSERTIONS=ON",
                         "-DLLVM_LIT_ARGS=--verbose -j24",
                         "-DLLVM_TARGETS_TO_BUILD=X86",
                         "-DLLVM_USE_LINKER=gold"])},
 
+    {'name': "llvm-clang-x86_64-gcc-ubuntu",
+    'tags'  : ["llvm", "clang", "clang-tools-extra", "compiler-rt", "lld", "cross-project-tests"],
+    'workernames': ["doug-linux-worker1"],
+    'builddir': "llvm-clang-x86_64-gcc-ubuntu",
+    'factory': UnifiedTreeBuilder.getCmakeWithNinjaBuildFactory(
+                    depends_on_projects=['llvm','clang','clang-tools-extra','compiler-rt'.'lld','cross-project-tests'],
+                    extra_configure_args=[
+                        "-DCMAKE_C_COMPILER=gcc",
+                        "-DCMAKE_CXX_COMPILER=g++",
+                        "-DCMAKE_BUILD_TYPE=Release",
+                        "-DLLVM_BUILD_RUNTIME=ON",
+                        "-DLLVM_BUILD_TESTS=ON",
+                        "-DLLVM_CCACHE_BUILD=ON",
+                        "-DLLVM_ENABLE_ASSERTIONS=ON",
+                        "-DLLVM_INCLUDE_EXAMPLES=OFF",
+                        "-DLLVM_LIT_ARGS=--verbose -j100",
+                        "-DLLVM_USE_LINKER=gold"])},
+
 # Polly builders.
 
     {'name' : "polly-arm-linux",
     'tags'  : ["polly"],
     'workernames' : ["hexagon-build-02", "hexagon-build-03"],
     'builddir': "polly-arm-linux",
     'factory' : PollyBuilder.getPollyBuildFactory(
                     clean=True,

buildbot/osuosl/master/config/workers.py

return [
         # Ubuntu x86_64
         create_worker("thinlto-x86-64-bot1", properties={'jobs': 64}, max_builds=1),
         create_worker("thinlto-x86-64-bot2", properties={'jobs': 64}, max_builds=1),
 
         # Ubuntu 20.04 on AWS, x86_64 PS4 target
         create_worker("sie-linux-worker", properties={'jobs': 40}, max_builds=1),
         # Ubuntu 22.04 on 2012 Mac Mini
         create_worker("sie-slow-linux-worker", properties={'jobs': 8}, max_builds=1),
+        # Ubuntu 18.04 on x86_64
+        create_worker("doug-linux-worker1", properties={'jobs': 16}, max_builds=1),
 
         # Windows Server 2019 on AWS, x86_64 PS4 target
         create_worker("sie-win-worker", properties={'jobs': 64}, max_builds=1),
 
         # XCore target, Ubuntu 20.04 x64 host
         create_worker("xcore-ubuntu20-x64", properties={'jobs': 4}, max_builds=1),
 
         # ARC Worker, CentOS 7.9 x86_64 Intel Xeon Platinum 8000 @ 3.6GHz, 32GB RAM