[rust] build_crubit.py: *statically* linking C++ stdlib.

Bug: 1338217
Change-Id: I204f30522164d3ccce4c99a63c32162a939afe33
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3750106
Reviewed-by: Collin Baker <collinbaker@chromium.org>
Commit-Queue: Łukasz Anforowicz <lukasza@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1050219}
NOKEYCHECK=True
GitOrigin-RevId: 5fe5d116d1ab94ff66a95411a5fcd2550cff6f78

Author: anforowicz

build_crubit.py

@@ -113,16 +113,8 @@ def BuildCrubit(gcc_toolchain_path):
     gcc_toolchain_flag = (f'--gcc-toolchain={gcc_toolchain_path}'
                           if gcc_toolchain_path else '')
     env["BAZEL_CXXOPTS"] = gcc_toolchain_flag
-    env["BAZEL_LINKOPTS"] = gcc_toolchain_flag
-    # TODO(https://crbug.com/1338217): Link C++ stdlib *statically*.
-    # Things tried so far:
-    # - Attempts that result in a sefgault when compiling Rust rlib ...
-    #     1a. env["BAZEL_LINKOPTS"] = f"{gcc_toolchain_flag}:-static"
-    #     1b. extra_args += ["--features=fully_static_link"]
-    #         # Optionally: extra_args += ["--sandbox_debug"]
-    # - Attempts that don't have any effect (`ldd ... rs_bindings_from_cc_impl`
-    #   still shows `libstdc++.so.6 => ...`):
-    #     2. extra_args += ["--dynamic_mode=off"]
+    env["BAZEL_LINKOPTS"] = f"{gcc_toolchain_flag}:-static-libstdc++"
+    env["BAZEL_LINKLIBS"] = f"{gcc_toolchain_path}/lib64/libstdc++.a:-lm"
 
     # Run bazel build ...
     args = [BAZEL_EXE, "build", "rs_bindings_from_cc:rs_bindings_from_cc_impl"]