Make the system bazelrc configurable.
The master bazelrc is now defined by preprocessor macro at (Bazel's) compile time. The default is still /etc/bazel.bazelrc for most platforms, but windows now has a %ProgramData% relative default value as well. Users wishing to change this default when building Bazel for a new platform should edit BAZEL_SYSTEM_BAZELRC_PATH in src/main/cpp/BUILD.
Part of https://github.com/bazelbuild/bazel/issues/4502, relevant to the duplicate issue #4809.
TESTED: default settings were tested manually, since they cannot be tested in a sandbox
RELNOTES: Windows default system bazelrc is read from the user's ProgramData if present.
PiperOrigin-RevId: 201423446
diff --git a/src/main/cpp/option_processor-internal.h b/src/main/cpp/option_processor-internal.h
index 8ebfb64..47f0df4 100644
--- a/src/main/cpp/option_processor-internal.h
+++ b/src/main/cpp/option_processor-internal.h
@@ -30,6 +30,8 @@
std::vector<std::string> DedupeBlazercPaths(
const std::vector<std::string>& paths);
+std::string FindSystemWideRc();
+
std::string FindRcAlongsideBinary(const std::string& cwd,
const std::string& path_to_binary);
