Gentoo Websites Logo
Go to: Gentoo Home Documentation Forums Lists Bugs Planet Store Wiki Get Gentoo!
Bug 863989 - www-apps/nextcloud-notify_push-0.3.0 fails to compile (lto): undefined reference to GFp_ia32cap_P
Summary: www-apps/nextcloud-notify_push-0.3.0 fails to compile (lto): undefined refere...
Status: RESOLVED OBSOLETE
Alias: None
Product: Gentoo Linux
Classification: Unclassified
Component: Current packages (show other bugs)
Hardware: All Linux
: Normal normal (vote)
Assignee: Fischl Anton
URL:
Whiteboard:
Keywords:
Depends on:
Blocks: lto
  Show dependency tree
 
Reported: 2022-08-06 15:12 UTC by Agostino Sarubbo
Modified: 2023-12-06 05:21 UTC (History)
2 users (show)

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


Attachments
build.log (build.log,504.46 KB, text/plain)
2022-08-06 15:12 UTC, Agostino Sarubbo
Details

Note You need to log in before you can comment on or make changes to this bug.
Description Agostino Sarubbo gentoo-dev 2022-08-06 15:12:15 UTC
https://blogs.gentoo.org/ago/2020/07/04/gentoo-tinderbox/

Issue: www-apps/nextcloud-notify_push-0.3.0 fails to compile (lto).
Discovered on: amd64 (internal ref: lto_tinderbox)

NOTE:
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 2022-08-06 15:12:18 UTC
Created attachment 798319 [details]
build.log

build log and emerge --info
Comment 2 Agostino Sarubbo gentoo-dev 2022-08-06 15:12:20 UTC
Error(s) that match a know pattern in addition to what has been reported in the summary:


          /usr/lib/gcc/x86_64-pc-linux-gnu/12.1.1/../../../../x86_64-pc-linux-gnu/bin/ld: ring.c759995a-cgu.10:(.text._ZN4ring4aead3aes21detect_implementation17h12b3ffb80e79a905E+0x9c): undefined reference to `GFp_ia32cap_P'
          ring.c759995a-cgu.10:(.text._ZN4ring4aead3aes21detect_implementation17h12b3ffb80e79a905E+0x29): undefined reference to `GFp_ia32cap_P'
          ring.c759995a-cgu.7:(.text._ZN4ring4aead17chacha20_poly130522chacha20_poly1305_open17h596bc30f4c63ff19E+0xa0): undefined reference to `GFp_ia32cap_P'
          ring.c759995a-cgu.7:(.text._ZN4ring4aead17chacha20_poly130522chacha20_poly1305_seal17h9e6b9229841e985dE+0x94): undefined reference to `GFp_ia32cap_P'
          ring.c759995a-cgu.7:(.text._ZN4ring4aead3gcm21detect_implementation17h0a5adb626008505fE+0x25): undefined reference to `GFp_ia32cap_P'
error: linking with `x86_64-pc-linux-gnu-gcc` failed: exit status: 1
Comment 3 Fischl Anton 2023-12-06 05:21:37 UTC
I tried different profiles with CFLAGS="-flto -Werror=odr -Werror=lto-type-mismatch -Werror=strict-aliasing" but I can't reproduce it with 0.30, 0.6.3 or 0.6.5

I'm guessing this has become obsolete with newer rustc or some related libs.