[libc] Move libc_errno.h to libc/src/__support and make LIBC_ERRNO_MODE_SYSTEM to be header-only.#143187

Merged

lntue merged 8 commits intollvm:mainfrom

lntue:libc_errno

Jun 11, 2025

Commits on Jun 11, 2025

[libc] Move libc_errno.h to libc/src/__support and make LIBC_ERRNO_MODE_SYSTEM to be header-only.
lntue
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Use LIBC_ERRNO_MODE_SYSTEM for libc/shared folder.
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Mass update "src/errno/libc_errno.h" -> "src/__support/libc_errno.h" and LIBC_NAMESPACE::libc_errno -> libc_errno.
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Add LIBC_ERRNO_MODE_SYSTEM_INLINE and use that as the default for libc/shared.
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Update `libcxx_shared_headers` in Bazel build.
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Error out when `LIBC_ERRNO_MODE` is set to something different from LIBC_ERRNO_MODE_SYSTEM_INLINE in shared/libc_common.h
lntue
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Add TODO about deprecating LIBC_ERRNO_MODE_SYSTEM.
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Update comments.
lntue
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