Bug 1713865
| Summary: | gcc 9 regression: "error: requested alignment is not an integer constant" | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Kalev Lember <klember> |
| Component: | gcc | Assignee: | Jakub Jelinek <jakub> |
| Status: | CLOSED ERRATA | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
| Severity: | unspecified | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 30 | CC: | davejohansen, dmalcolm, fweimer, jakub, jwakely, law, mpolacek, msebor, nickc |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | If docs needed, set a value | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2019-09-07 12:54:05 UTC | Type: | Bug |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | |||
| Bug Blocks: | 1675396 | ||
Looks like this regressed with r261971. I'll open an upstream PR. Great, thanks for tracking that down! Reduced test by Matthew:
constexpr unsigned long a(const unsigned long b) { return b; }
const unsigned long c = a(alignof(int));
alignas(c) char d;
Fixed for GCC 9.2 and 10. Should be in the next Fedora update. Awesome, thanks! This is now fixed in gcc 9.2.1. Thanks! |
The following code compiles fine on gcc 8, but errors out on gcc 9 with "error: requested alignment is not an integer constant": #include <algorithm> #include <cstddef> struct One {}; struct Two {}; static constexpr const size_t ALIGNMENT = std::max(alignof(One), alignof(Two)); struct Foo { alignas(ALIGNMENT) char value; }; This is a minimal reproducer based on mmapper FTBFS from https://bugzilla.redhat.com/show_bug.cgi?id=1675396