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Bug 879521 - dev-python/mitmproxy_wireguard-0.1.16 fails to compile (LTO-SYSTEM): undefined reference to GFp_ia32cap_P
Summary: dev-python/mitmproxy_wireguard-0.1.16 fails to compile (LTO-SYSTEM): undefine...
Status: CONFIRMED
Alias: None
Product: Gentoo Linux
Classification: Unclassified
Component: Current packages (show other bugs)
Hardware: All Linux
: Normal normal (vote)
Assignee: No maintainer - Look at https://wiki.gentoo.org/wiki/Project:Proxy_Maintainers if you want to take care of it
URL:
Whiteboard:
Keywords:
Depends on:
Blocks: lto
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Reported: 2022-11-04 08:10 UTC by Agostino Sarubbo
Modified: 2024-01-21 14:13 UTC (History)
0 users

See Also:
Package list:
Runtime testing required: ---


Attachments
build.log (build.log,193.24 KB, text/plain)
2022-11-04 08:10 UTC, Agostino Sarubbo
Details

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Description Agostino Sarubbo gentoo-dev 2022-11-04 08:10:02 UTC
https://blogs.gentoo.org/ago/2020/07/04/gentoo-tinderbox/

Issue: dev-python/mitmproxy_wireguard-0.1.16 fails to compile (LTO-SYSTEM).
Discovered on: amd64 (internal ref: lto_tinderbox)

NOTE:
(LTO-SYSTEM) in the summary means that bug was found on a machine that runs lto but this bug MAY or MAY NOT BE related to lto.

This machine uses lto with CFLAGS=-flto -Werror=odr -Werror=lto-type-mismatch -Werror=strict-aliasing

Here is a bit of explanation:

-Werror=lto-type-mismatch:
User to find possible runtime issues in packages. It likely means the package is unsafe to build & use with LTO.
For projects using the same identifier but with different types across different files, they must be fixed to be consistent across the codebase.

-Werror=odr:
Used to find possible runtime issues in packages. These bugs are a problem anyway but may be even worse when combined with LTO. C++ code must comply with the One Definition Rule (ODR) - see https://en.cppreference.com/w/cpp/language/definition#One_Definition_Rule.

-Werror=strict-aliasing:
Used to find possible runtime issues in packages. These bugs are a problem anyway but may be even worse when combined with LTO.

Workarounds:
- If upstream is friendly and still active, file a bug upstream. For emulators, codecs, games, or multimedia packages, it may be worth just applying a workaround instead, as upstreams sometimes aren't receptive to these bugs (VALID FOR ALL).
- Use the new 'filter-lto' from flag-o-matic.eclass as it's likely to be unsafe with LTO (VALID FOR lto-type-mismatch - odr).
- Fix it yourself if interested, of course (VALID FOR ALL).
- Append-flags -fno-strict-aliasing (VALID FOR strict-aliasing).
- Use memcpy() but a union is sometimes suitable too (VALID FOR strict-aliasing).
- -fstrict-aliasing is implied by -O2, so this must be addressed in some form (VALID FOR strict-aliasing).

See also: https://marc.info/?l=gentoo-dev&m=165639574126280&w=2
Comment 1 Agostino Sarubbo gentoo-dev 2022-11-04 08:10:04 UTC
Created attachment 826907 [details]
build.log

build log and emerge --info
Comment 2 Agostino Sarubbo gentoo-dev 2022-11-04 08:10:06 UTC
Error(s) that match a know pattern in addition to what has been reported in the summary:


          /var/tmp/portage/dev-python/mitmproxy_wireguard-0.1.16/work/cargo_home/gentoo/ring-0.16.20/pregenerated/chacha-x86_64-elf.S:53: undefined reference to `GFp_ia32cap_P'
          mitmproxy_wireguard.51302d05-cgu.0:(.text._ZN4ring4aead17chacha20_poly130522chacha20_poly1305_open17h76665aa2e4283b23E+0x3f): undefined reference to `GFp_ia32cap_P'
          mitmproxy_wireguard.51302d05-cgu.0:(.text._ZN4ring4aead17chacha20_poly130522chacha20_poly1305_seal17h4838981405aeee2fE+0x3b): undefined reference to `GFp_ia32cap_P'
Error: command ['maturin', 'pep517', 'build-wheel', '-i', '/usr/bin/python3.9', '--compatibility', 'off', '--jobs=16', '--skip-auditwheel'] returned non-zero exit status 1
error: could not compile `mitmproxy_wireguard` due to 2 previous errors