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[libc++] libc++ doesn't compile with gcc 15 #117319

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killcerr opened this issue Nov 22, 2024 · 1 comment · Fixed by #137871
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[libc++] libc++ doesn't compile with gcc 15 #117319

killcerr opened this issue Nov 22, 2024 · 1 comment · Fixed by #137871
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build-problem libc++ libc++ C++ Standard Library. Not GNU libstdc++. Not libc++abi.

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@killcerr
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libc++ doesn't compile with GCC 15 because it comes with new GCC __decay built-in which is incompatible with libc++.
similar issue
the bug file
@github-actions github-actions bot added the libc++ libc++ C++ Standard Library. Not GNU libstdc++. Not libc++abi. label Nov 22, 2024
killcerr added a commit to killcerr/llvm-project that referenced this issue Nov 22, 2024
@killcerr
[libc++] Fix failures with GCC 15 (llvm#117319)
b1eb871
@killcerr killcerr mentioned this issue Nov 22, 2024
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@frederick-vs-ja frederick-vs-ja mentioned this issue Apr 29, 2025
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@frobtech
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There are numerous other new built-ins that have the same issues. __decay is just the most widely-used of them.
#137704 lists all of them.

frobtech added a commit to frobtech/llvm-project that referenced this issue Apr 29, 2025
@frobtech
[libc++] Support more GCC 15 type_traits builtins
8d2d49d 
GCC 15 has added builtins for various C++ type traits that Clang
already had.  Since __has_builtin(...) now finds these, the #if
branches previously only used for Clang are now used for GCC 15.
However, GCC 15 requires that these builtins only be used in type
aliases, not in template aliases.

These changes follow the model of llvm#81386 where a previous GCC
version added builtins for __remove_cv and __remove_cvref.

Fixed: llvm#137704
Fixed: llvm#117319
@frobtech frobtech mentioned this issue Apr 29, 2025
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build-problem libc++ libc++ C++ Standard Library. Not GNU libstdc++. Not libc++abi.
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@frobtech @EugeneZelenko @killcerr