First cov with clang20 on linux

Author: martin4861

cc/toolchains/llvm20/llvm.BUILD.bzl

@@ -66,6 +66,7 @@ filegroup(
             "lib/libclang*.a",
             "lib/liblld*.a",
         ],
+        allow_empty = True,
     ),
     # Do not include the .dylib files in the linker sandbox because they will
     # not be available at runtime. Any library linked from the toolchain should

test/small_world/.bazelrc

@@ -1 +1,67 @@
 common --@rules_swiftnav//cc:enable_bzlmod=true
+
+# # build:use_llvm20 --platforms=@rules_swiftnav//platforms:x86_64_darwin_llvm20
+# # build:use_llvm20 --platforms=@rules_swiftnav//platforms:aarch64_darwin_llvm20
+# build:use_llvm20 --platforms=@rules_swiftnav//platforms:x86_64_linux_llvm20
+# # build:use_llvm20 --platforms=@rules_swiftnav//platforms:aarch64_linux_llvm20
+
+build:coverage_x86_64_linux --platforms=@rules_swiftnav//platforms:x86_64_linux_llvm20
+
+build:coverage_aarch64_darwin --platforms=@rules_swiftnav//platforms:aarch64_darwin_llvm20
+
+# # Overrides our custom toolchain and uses the system
+# build:system --noincompatible_enable_cc_toolchain_resolution
+
+# build:system --action_env=BAZEL_DO_NOT_DETECT_CPP_TOOLCHAIN="0"
+
+# build:system --platform_suffix=system
+
+# # build --config=system
+# build --nojava_deps
+# build --define=BAZEL_USE_SYSTEM_ZLIB=1
+# build --spawn_strategy=local
+# build --strategy=Genrule=local
+# build --strategy=CppCompile=local
+# build --strategy=TestRunner=local
+# build --strategy=Javac=local
+# build --strategy=Closure=local
+# build --strategy=GoCompile=local
+# build --strategy=GoLink=local
+# build --strategy=GoTest=local
+# build --strategy=GoVet=local
+# build --strategy=ObjcCompile=local
+# build --strategy=ObjcLink=local
+# build --strategy=SwiftCompile=local
+# build --strategy=Dart=local
+# build --strategy=Worker=local
+# build --strategy=ProtoCompile=local
+# build --strategy=PyCompile=local
+# build --strategy=PyTest=local
+# build --strategy=TypeScriptCompile=local
+# build --strategy=TypeScriptTest=local
+
+# test --spawn_strategy=local
+# test --strategy=TestRunner=local
+
+coverage --spawn_strategy=local
+coverage --strategy=TestRunner=local
+coverage --action_env=COVERAGE_GCOV_PATH="/opt/homebrew/opt/llvm/bin/llvm-profdata"
+coverage --action_env=BAZEL_USE_LLVM_NATIVE_COVERAGE=1
+coverage --action_env=GCOV_PREFIX_STRIP=10
+coverage --cxxopt=-mllvm
+coverage --copt=-mllvm
+coverage --cxxopt=-system-headers-coverage
+coverage --copt=-system-headers-coverage
+
+
+
+# bazel coverage --config=coverage_aarch64_darwin //src/base_math:base_math_test --subcommands
+
+
+# on ubuntu!
+# 1.
+# bazel coverage --config=coverage_x86_64_linux //src/base_math:base_math_test --subcommands --experimental_generate_llvm_lcov --combined_report=lcov
+# 2.
+# /home/jenkins/.cache/bazel/_bazel_jenkins/5a7b992760bae9ecbea2fa12e457bcb7/execroot/_main/bazel-out/_coverage/_coverage_report.dat
+# copy
+# 3. genhtml --output html cov.dat

test/small_world/MODULE.bazel

@@ -10,19 +10,19 @@ local_path_override(
 swift_cc_toolchain_ext = use_extension("@rules_swiftnav//cc:extensions.bzl", "swift_cc_toolchain_extension")
 use_repo(
     swift_cc_toolchain_ext,
-    "aarch64-darwin-llvm",
-    "aarch64-linux-llvm",
+    "aarch64-darwin-llvm20",
+    "aarch64-linux-llvm20",
     "aarch64-sysroot",
-    "x86_64-darwin-llvm",
-    "x86_64-linux-llvm",
+    "x86_64-darwin-llvm20",
+    "x86_64-linux-llvm20",
     "x86_64-sysroot",
 )
 
 register_toolchains(
-    "@rules_swiftnav//cc/toolchains/llvm/aarch64-darwin:cc-toolchain-aarch64-darwin",
-    "@rules_swiftnav//cc/toolchains/llvm/x86_64-darwin:cc-toolchain-x86_64-darwin",
-    "@rules_swiftnav//cc/toolchains/llvm/aarch64-linux:cc-toolchain-aarch64-linux",
-    "@rules_swiftnav//cc/toolchains/llvm/x86_64-linux:cc-toolchain-x86_64-linux",
+    "@rules_swiftnav//cc/toolchains/llvm20/aarch64-darwin:cc-toolchain-aarch64-darwin",
+    "@rules_swiftnav//cc/toolchains/llvm20/x86_64-darwin:cc-toolchain-x86_64-darwin",
+    "@rules_swiftnav//cc/toolchains/llvm20/aarch64-linux:cc-toolchain-aarch64-linux",
+    "@rules_swiftnav//cc/toolchains/llvm20/x86_64-linux:cc-toolchain-x86_64-linux",
 )
 
 bazel_dep(name = "googletest", version = "1.16.0")