[libc++] Provide flag for RUNTIMES_USE_LIBC=llvm-libc (#174967)#691
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voltur01 merged 1 commit intoarm:release/arm-software/22.xfrom Jan 22, 2026
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There was no flag added for llvm-libc when picolibc and newlib were provided in llvm/llvm-project#147956 - the missing flag breaks libc++ iostream support now because this check https://github.com/llvm/llvm-project/blob/9a8421fa6191d2e1047e3dc8c72a22fa810f9aee/libcxx/include/__config#L719 fails unless an LLVM libc header is included.
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pawosm-arm
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Jan 21, 2026
HugoSilvaSantos
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Jan 22, 2026
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There was no flag added for llvm-libc when picolibc and newlib were provided in llvm/llvm-project#147956 - the missing flag breaks libc++ iostream support now because this check https://github.com/llvm/llvm-project/blob/9a8421fa6191d2e1047e3dc8c72a22fa810f9aee/libcxx/include/__config#L719 fails unless an LLVM libc header is included.
Downstream issue: #690