bazel: fix the compilation of .proto on Darwin (#63879)

On Darwin, the last argument to GCC is coming up as an empty string.
This is breaking the build of proto_library targets. However, I was not
able to reproduce with the example cpp project[0].

This commit patches the cc_wrapper of Bazel that gets installed on
Darwin to remove the last argument if it's an empty string. This is
not a probem on Linux.

[0]: https://github.com/bazelbuild/examples/tree/master/cpp-tutorial/stage3

pkgs/development/tools/build-managers/bazel/cpp-test.nix

@@ -0,0 +1,49 @@
+{
+  bazel
+, bazelTest
+, bazel-examples
+, gccStdenv
+, lib
+, runLocal
+, runtimeShell
+, writeScript
+, writeText
+}:
+
+let
+
+  toolsBazel = writeScript "bazel" ''
+    #! ${runtimeShell}
+
+    export CXX='${gccStdenv.cc}/bin/g++'
+    export LD='${gccStdenv.cc}/bin/ld'
+    export CC='${gccStdenv.cc}/bin/gcc'
+
+    # XXX: hack for macosX, this flags disable bazel usage of xcode
+    # See: https://github.com/bazelbuild/bazel/issues/4231
+    export BAZEL_USE_CPP_ONLY_TOOLCHAIN=1
+
+    exec "$BAZEL_REAL" "$@"
+  '';
+
+  workspaceDir = runLocal "our_workspace" {} (''
+    cp -r ${bazel-examples}/cpp-tutorial/stage3 $out
+    find $out -type d -exec chmod 755 {} \;
+  ''
+  + (lib.optionalString gccStdenv.isDarwin ''
+    mkdir $out/tools
+    cp ${toolsBazel} $out/tools/bazel
+  ''));
+
+  testBazel = bazelTest {
+    name = "bazel-test-cpp";
+    inherit workspaceDir;
+    bazelPkg = bazel;
+    bazelScript = ''
+      ${bazel}/bin/bazel \
+        build --verbose_failures \
+          //...
+    '';
+  };
+
+in testBazel