#412 closed defect (fixed)
Compiler flag -fwrapv is not known to GCC 3.3.5
| Reported by: | Christian Kellermann | Owned by: | felix winkelmann |
|---|---|---|---|
| Priority: | major | Milestone: | 4.9.0 |
| Component: | build system | Version: | 4.6.x |
| Keywords: | compiler flags build system | Cc: | |
| Estimated difficulty: |
Description
This breaks the build on OpenBSD. (Yes the compiler is ancient). Which is the recommended gcc version that should be used? OpenBSD has a newer GCC in its ports (4.2.x 4.3.x) so it is no problem if this fact is set in stone (aka the readme) somewhere. Or have I missed it? Removing this flag from the makefile of course fixes the issue.
What I gathered from other sources on the net is that versions above or equal to 4.2.4 work ok with it, while 4.1 versions do have issues.
Then again maybe it is just the linux kernel. Source: https://patchwork.kernel.org/patch/35097/
Attachments (1)
Change History (8)
comment:1 by , 15 years ago
comment:2 by , 15 years ago
Well, I'm not sure what to do. Would it be acceptable to require 4.2 or higher? As I understand, this option enables "normal" overflow of integer arithmetic (2s complement), which I think (just think) is required for the fixnum-overflow detection (Gambit uses this flag and I recall readinf somewhere on its mailing list about the flag being "required for correctness", whatever that means).
by , 15 years ago
| Attachment: | openbsd-3.3.5.diff added |
|---|
diff to disable flag when building on openbsd
comment:4 by , 15 years ago
Attached is a patch that excludes the flag when building on OpenBSD. Maybe a check against the compiler version is better though...
Tested against 4.6.2 it seems to work, all tests run fine.
comment:5 by , 15 years ago
| Resolution: | → fixed |
|---|---|
| Status: | new → closed |
Thanks, Christian. Patch is applied (experimental).
This has been introduced by
commit 52cad50d492e2e599bb845dbcfc514274eea5aac
Author: felix <felix@…>
Date: Thu Sep 16 04:40:25 2010 -0400
Sorry for not catching this earlier. I have setup a cron job that does a daily build now.