Bug 19604
| Summary: | gcc miscompiles Mysql on IA32 with "-O2"(O1 works) | ||||||||||||||||
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| Product: | [Retired] Red Hat Linux | Reporter: | Trond Eivind Glomsrxd <teg> | ||||||||||||||
| Component: | gcc | Assignee: | Jakub Jelinek <jakub> | ||||||||||||||
| Status: | CLOSED NOTABUG | QA Contact: | |||||||||||||||
| Severity: | high | Docs Contact: | |||||||||||||||
| Priority: | high | ||||||||||||||||
| Version: | 7.0 | CC: | dr | ||||||||||||||
| Target Milestone: | --- | ||||||||||||||||
| Target Release: | --- | ||||||||||||||||
| Hardware: | i386 | ||||||||||||||||
| OS: | Linux | ||||||||||||||||
| Whiteboard: | |||||||||||||||||
| Fixed In Version: | Doc Type: | Bug Fix | |||||||||||||||
| Doc Text: | Story Points: | --- | |||||||||||||||
| Clone Of: | Environment: | ||||||||||||||||
| Last Closed: | 2000-10-24 19:44:19 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: | |||||||||||||||||
| Bug Depends On: | |||||||||||||||||
| Bug Blocks: | 18620, 18905 | ||||||||||||||||
| Attachments: |
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Description
Trond Eivind Glomsrxd
2000-10-23 14:31:52 UTC
Created attachment 4553 [details]
assembly file with "-O1"
Created attachment 4554 [details]
assembly file with -O2
Created attachment 4555 [details]
ii file of field.cc
Created attachment 4556 [details]
test script for mysql
Created attachment 4557 [details]
test script for mysql
That file is full of code dancing around the edge of what is and what is not allowed with -fstrict-aliasing. Either compile that file with -fno-strict-aliasing, or find out which exact routine causes the testcase to fail and I'll tell you whether it is valid C or not (but I assume the latter). Basically, a char pointer can alias with any type, otherwise one should access variables only through compatible types. Is there a way to turn this on/off inside the source file? Suggestions on how to find which function? Closing - Jakub found bugs (aliasing) in the Mysql code. Created attachment 4654 [details]
Patch for aliasing problems in mysql
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