Provide BAZEL_CURRENT_REPOSITORY local define in cc_* rules

`BAZEL_CURRENT_REPOSITORY` contains the canonical name of the repository
containing the current target and is required to look up runfiles using
apparent repository names when repository mappings are used, e.g. with
Bzlmod.

Work towards bazelbuild#16124

src/main/starlark/builtins_bzl/common/cc/cc_binary.bzl

@@ -690,7 +690,7 @@ def cc_binary_impl(ctx, additional_linkopts):
         cc_toolchain = cc_toolchain,
         user_compile_flags = cc_helper.get_copts(ctx, common, feature_configuration, additional_make_variable_substitutions),
         defines = common.defines,
-        local_defines = common.local_defines,
+        local_defines = common.local_defines + cc_helper.get_local_defines_for_runfiles_lookup(ctx),
         loose_includes = common.loose_include_dirs,
         system_includes = common.system_include_dirs,
         private_hdrs = common.private_hdrs,

src/main/starlark/builtins_bzl/common/cc/cc_helper.bzl

@@ -916,6 +916,9 @@ def _is_stamping_enabled_for_aspect(ctx):
         stamp = ctx.rule.attr.stamp
     return stamp
 
+def _get_local_defines_for_runfiles_lookup(ctx):
+    return ["BAZEL_CURRENT_REPOSITORY=\"{}\"".format(ctx.label.workspace_name)]
+
 cc_helper = struct(
     merge_cc_debug_contexts = _merge_cc_debug_contexts,
     is_code_coverage_enabled = _is_code_coverage_enabled,
@@ -960,4 +963,5 @@ cc_helper = struct(
     build_linking_context_from_libraries = _build_linking_context_from_libraries,
     is_stamping_enabled = _is_stamping_enabled,
     is_stamping_enabled_for_aspect = _is_stamping_enabled_for_aspect,
+    get_local_defines_for_runfiles_lookup = _get_local_defines_for_runfiles_lookup,
 )

src/main/starlark/builtins_bzl/common/cc/cc_library.bzl

@@ -58,7 +58,7 @@ def _cc_library_impl(ctx):
         feature_configuration = feature_configuration,
         user_compile_flags = cc_helper.get_copts(ctx, common, feature_configuration, additional_make_variable_substitutions),
         defines = common.defines,
-        local_defines = common.local_defines,
+        local_defines = common.local_defines + cc_helper.get_local_defines_for_runfiles_lookup(ctx),
         loose_includes = common.loose_include_dirs,
         system_includes = common.system_include_dirs,
         copts_filter = common.copts_filter,

src/test/shell/bazel/cc_integration_test.sh

@@ -1506,4 +1506,33 @@ EOF
   expect_log "\"PWD\": \"/proc/self/cwd\""
 }
 
+function test_bazel_current_repository_define() {
+  mkdir -p pkg
+  cat > pkg/BUILD.bazel <<'EOF'
+cc_library(
+  name = "library",
+  srcs = ["define.cpp"],
+)
+cc_binary(
+  name = "binary",
+  srcs = ["define.cpp"],
+)
+cc_test(
+  name = "test",
+  srcs = ["define.cpp"],
+)
+EOF
+
+  cat > pkg/define.cpp <<'EOF'
+#include <iostream>
+int main() {
+  std::cout << BAZEL_CURRENT_REPOSITORY << std::endl;
+}
+EOF
+
+  bazel build //pkg:library &>"$TEST_log" || fail "Build should succeed"
+  bazel build //pkg:binary &>"$TEST_log" || fail "Build should succeed"
+  bazel build //pkg:test &>"$TEST_log" || fail "Build should succeed"
+}
+
 run_suite "cc_integration_test"