[SYCL][CI] Provide --ci-defaults option for config script (#4583)

Default options for CI and user build environments have different
requirements. New option will be used by CI to get strict set of options,
like enabling -Werror. Running script without arguments will set sensible
defaults for those, who are building compiler toolchain for use, rather
than contributing to this project.

At the moment this option is nop.

Author: Alexander Batashev

.github/workflows/linux_post_commit.yml

@@ -42,7 +42,7 @@ jobs:
          mkdir -p $GITHUB_WORKSPACE/build
          cd $GITHUB_WORKSPACE/build
          python3 $GITHUB_WORKSPACE/src/buildbot/configure.py -w $GITHUB_WORKSPACE \
-         -s $GITHUB_WORKSPACE/src -o $GITHUB_WORKSPACE/build -t Release $ARGS
+         -s $GITHUB_WORKSPACE/src -o $GITHUB_WORKSPACE/build -t Release --ci-defaults $ARGS
      - name: Compile
        run: |
          python3 $GITHUB_WORKSPACE/src/buildbot/compile.py -w  $GITHUB_WORKSPACE \

buildbot/configure.py

@@ -41,6 +41,11 @@ def do_configure(args):
 
     sycl_enable_xpti_tracing = 'ON'
 
+    if args.ci_defaults:
+        print("#############################################")
+        print("# Default CI configuration will be applied. #")
+        print("#############################################")
+
     # replace not append, so ARM ^ X86
     if args.arm:
         llvm_targets_to_build = 'ARM;AArch64'
@@ -193,6 +198,7 @@ def main():
     parser.add_argument("--libcxx-library", metavar="LIBCXX_LIBRARY_PATH", help="libcxx library path")
     parser.add_argument("--use-lld", action="store_true", help="Use LLD linker for build")
     parser.add_argument("--llvm-external-projects", help="Add external projects to build. Add as comma seperated list.")
+    parser.add_argument("--ci-defaults", action="store_true", help="Enable default CI parameters")
     args = parser.parse_args()
 
     print("args:{}".format(args))