Bug 426181
Summary: | 4.1.2 20070925 (Red Hat 4.1.2-33) -fstrict-aliasing causes skipped code | ||
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Product: | [Fedora] Fedora | Reporter: | Ehud Gavron <gavron> |
Component: | gcc | Assignee: | Jakub Jelinek <jakub> |
Status: | CLOSED WONTFIX | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
Severity: | high | Docs Contact: | |
Priority: | low | ||
Version: | 8 | ||
Target Milestone: | --- | ||
Target Release: | --- | ||
Hardware: | x86_64 | ||
OS: | Linux | ||
Whiteboard: | |||
Fixed In Version: | Doc Type: | Bug Fix | |
Doc Text: | Story Points: | --- | |
Clone Of: | Environment: | ||
Last Closed: | 2007-12-19 07:55:00 UTC | Type: | --- |
Regression: | --- | Mount Type: | --- |
Documentation: | --- | CRM: | |
Verified Versions: | Category: | --- | |
oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
Cloudforms Team: | --- | Target Upstream Version: | |
Embargoed: |
Description
Ehud Gavron
2007-12-19 01:46:58 UTC
The symptoms appear when compiling kernel module drivers/net/wireless/b43/rfkill.c The code that calls KEY_WLAN 1 and KEY_WLAN 0 is optimized out. This is why Fedora 2.6.22-1.42 (f8 x86_64) worked in lighting the LED and Fedora 2.6.22-1.49 (same arch) didn't. Same code, different compilation result. There are additional examples in the references bugzillas... just thought I'd add a Fedora-specific one. I'm not a compiler-internals guy. Just pointing out this was patched in the gnu 4.1.2 but not in the RH/F 4.1.2. Kernel modules should be compiled with -fno-strict-aliasing anyway, kernel violates aliasing in hundreds of places. If you read the PR properly, it would be clear this is a WONTFIX for 4.1.x/4.2.x, the changes aren't really backportable to earlier GCC versions and are massive. |