pw_libcxx: Only enable in clang builds

Change-Id: I7555c147c5502c2410e61449395eeaa351e0ad36
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/211941
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
Presubmit-Verified: CQ Bot Account <pigweed-scoped@luci-project-accounts.iam.gserviceaccount.com>
Original-Reviewed-by: Armando Montanez <amontanez@google.com>
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/llvm-integration/+/235147
Commit-Queue: Prabhu Karthikeyan Rajasekaran <prabhukr@google.com>
Reviewed-by: Keir Mierle <keir@google.com>
Reviewed-by: Armando Montanez <amontanez@google.com>
1 file changed
tree: 119b02753de1af9fa9b01eb0c44757255594af04
  1. pw_libc/
  2. pw_libcxx/
  3. third_party/
  4. AUTHORS
  5. CONTRIBUTING.md
  6. LICENSE
  7. OWNERS
  8. README.md
README.md

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