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Bug 1923664
| Summary: | compiler-rt: FTBFS in Fedora rawhide/f34 | ||||||||||
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| Product: | [Fedora] Fedora | Reporter: | Fedora Release Engineering <releng> | ||||||||
| Component: | compiler-rt | Assignee: | Tom Stellard <tstellar> | ||||||||
| Status: | ASSIGNED --- | QA Contact: | Fedora Extras Quality Assurance <extras-qa> | ||||||||
| Severity: | unspecified | Docs Contact: | |||||||||
| Priority: | unspecified | ||||||||||
| Version: | 34 | CC: | airlied, jakub, law, nathan, sguelton, siddharth.kde, tstellar | ||||||||
| 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: | Type: | --- | |||||||||
| 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: | 1868278, 1922673 | ||||||||||
| Attachments: |
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Description
Fedora Release Engineering
2021-02-01 17:23:56 UTC
Created attachment 1753927 [details]
build.log
file build.log too big, will only attach last 32768 bytes
Created attachment 1753928 [details]
root.log
file root.log too big, will only attach last 32768 bytes
Created attachment 1753929 [details]
state.log
Builds with gcc-11.0.0-0.16.fc34 but fails with gcc-11.0.0-0.17.fc34. It looks like compiler-rt's feature checks are getting confused and it thinks the compiler supports these flags: /wd4146 /wd4291 /wd4391 /wd4722 /wd4800 But gcc complains about this. Here is a small reproducer that demonstrates the change in behavior:
gcc-10.2.1-9.fc33:
echo 'int main() { return 0; }' | gcc /wd48000 -x c -c -
gcc: error: /wd48000: No such file or directory
gcc-11.0.0-0.18.fc34:
echo 'int main() { return 0; }' | g++ /wd48000 -x c -c -
g++: warning: /wd48000: linker input file unused because linking not done
compiler-rt uses the standard cmake function: check_cxx_compiler_flag[1] to check for supported compiler flags, so it's likely that other packages that use cmake and check for this kind of flag could also hit the same problem.
[1] https://cmake.org/cmake/help/latest/module/CheckCXXCompilerFlag.html
sorry about that, this patch is now on trunk: 6606b852bfa 2021-02-04 | driver: error for nonexistent linker inputs [PR 98943] This bug appears to have been reported against 'rawhide' during the Fedora 34 development cycle. Changing version to 34. |