error: no member named 'get' in the global namespace

[kraj]

With latest clang/main, seeing this error in compiling abseil-cpp from chromium using libc++ for runtime

clang version 19.0.0 (/home/kraj/work/llvm-project 1a4118f155f3446577cb0a93479d40fd8606a570)                                                                          Target: aarch64-unknown-linux

clang++ -target aarch64-linux hash.i -std=gnu++20

../../../../../git/src/3rdparty/chromium/third_party/abseil-cpp/absl/container/internal/compressed_tuple.h:252:42: error: no member named 'get' in the global namespace
  252 |     return std::move(*this).StorageT<I>::get();
      |                                        ~~^
../../../../../git/src/3rdparty/chromium/third_party/abseil-cpp/absl/container/internal/compressed_tuple.h:257:43: error: no member named 'get' in the global namespace
  257 |     return absl::move(*this).StorageT<I>::get();
      |                                         ~~^
2 errors generated.

hash.i.zip

[llvmbot]

@llvm/issue-subscribers-clang-frontend

Author: Khem Raj (kraj)

With latest clang/main, seeing this error in compiling abseil-cpp from chromium using libc++ for runtime

clang version 19.0.0 (/home/kraj/work/llvm-project 1a4118f155f3446577cb0a93479d40fd8606a570)                                                                          Target: aarch64-unknown-linux

clang++ -target aarch64-linux hash.i -std=gnu++20

../../../../../git/src/3rdparty/chromium/third_party/abseil-cpp/absl/container/internal/compressed_tuple.h:252:42: error: no member named 'get' in the global namespace
  252 |     return std::move(*this).StorageT<I>::get();
      |                                        ~~^
../../../../../git/src/3rdparty/chromium/third_party/abseil-cpp/absl/container/internal/compressed_tuple.h:257:43: error: no member named 'get' in the global namespace
  257 |     return absl::move(*this).StorageT<I>::get();
      |                                         ~~^
2 errors generated.

hash.i.zip

[mizvekov]

This looks related to CWG1835, lastly implemented in #98547

Adding template keyword before Storage should fix it, but CWG1835 ended up being a very disruptive change, and in the future we will try make this a warning, not an error.

[cor3ntin]

Fixed by 59e56ee