Fix build with newer Apple clang#13157
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Four issues from newer Apple clang (version 21): 1. TextView.h: -Wdeprecated-literal-operator flags the whitespace between `""` and the suffix identifier in user-defined literal operator declarations. Remove the space in `operator"" _tv` and `operator"" _sv`. 2. configure.ac: the version check added in PR apache#12834 only applied -Wno-cast-function-type-mismatch when Apple clang was exactly version 17, so the flag was silently skipped on 21+. Extend the check to match version >= 17. 3. CryptoHash.h: memset/memcpy on non-trivially-copyable union type trip -Wnontrivial-memcall. Cast `this` to `void *`. 4. HostStatus.cc: same issue with bzero on HostStatRec.
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[approve ci autest 2] |
zwoop
reviewed
May 13, 2026
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| /// Default constructor - init to zero. | ||
| CryptoHash() { memset(this, 0, sizeof(*this)); } | ||
| CryptoHash() { memset(static_cast<void *>(this), 0, sizeof(*this)); } |
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Claude had an interesting thought on this, not for now, but for future. Maybe he's right, and we could simplify this "core" class.
The warning symptom is that a user-defined default constructor and
user-defined copy-assignment make the union non-trivially-copyable even
though every member is a `uint*_t` array. A cleaner long-term fix
(master only — not for 9.2.x) would be to initialize `u64{}` in-class
and default `operator=`, making the union genuinely trivially copyable
and retiring the memset/memcpy entirely. Filing a follow-up on master is
the right venue for that — this PR is the correct minimum for the
release branch.
zwoop
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May 13, 2026
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One thought / comment (not sure what we did for master), and likely for @bneradt : Does the changes to TextView also need to go into the libswoc code repository ? |
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Four issues from newer Apple clang (version 21):
TextView.h: -Wdeprecated-literal-operator flags the whitespace between
""and the suffix identifier in user-defined literal operator declarations. Remove the space inoperator"" _tvandoperator"" _sv.configure.ac: the version check added in PR Make 9.2.x buildable on macOS 26 #12834 only applied -Wno-cast-function-type-mismatch when Apple clang was exactly version 17, so the flag was silently skipped on 21+. Extend the check to match version >= 17.
CryptoHash.h: memset/memcpy on non-trivially-copyable union type trip -Wnontrivial-memcall. Cast
thistovoid *.HostStatus.cc: same issue with bzero on HostStatRec.