Bug 865945

Summary:	app-pda/jpilot-1.8.2-r1 fails to compile (lto): utils.c:69:19: error: type of glob_date_label does not match original declaration [-Werror=lto-type-mismatch]
Product:	Gentoo Linux	Reporter:	Agostino Sarubbo <ago>
Component:	Current packages	Assignee:	No maintainer - Look at https://wiki.gentoo.org/wiki/Project:Proxy_Maintainers if you want to take care of it <maintainer-needed>
Status:	RESOLVED FIXED
Severity:	normal	Keywords:	PullRequest
Priority:	Normal
Version:	unspecified
Hardware:	All
OS:	Linux
See Also:	https://github.com/gentoo/gentoo/pull/28630
Whiteboard:
Package list:		Runtime testing required:	---
Bug Depends on:
Bug Blocks:	618550
Attachments:	build.log

Description Agostino Sarubbo gentoo-dev

2022-08-21 14:53:41 UTC

https://blogs.gentoo.org/ago/2020/07/04/gentoo-tinderbox/

Issue: app-pda/jpilot-1.8.2-r1 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

2022-08-21 14:53:43 UTC

Created attachment 800373 [details]
build.log

build log and emerge --info

Comment 2 Larry the Git Cow gentoo-dev

2022-12-16 05:11:02 UTC

The bug has been closed via the following commit(s):

https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=64104056cfa17860d3b5c3ec87794fb2cfe80949

commit 64104056cfa17860d3b5c3ec87794fb2cfe80949
Author:     Pascal Jäger <pascal.jaeger@leimstift.de>
AuthorDate: 2022-12-10 20:18:56 +0000
Commit:     Sam James <sam@gentoo.org>
CommitDate: 2022-12-16 05:10:11 +0000

    app-pda/jpilot: add 2.0.1, fix configure for clang16
    
    Closes: https://bugs.gentoo.org/870535
    Closes: https://bugs.gentoo.org/865945
    Signed-off-by: Pascal Jäger <pascal.jaeger@leimstift.de>
    Closes: https://github.com/gentoo/gentoo/pull/28630
    Signed-off-by: Sam James <sam@gentoo.org>

 app-pda/jpilot/Manifest                            |  1 +
 .../files/jpilot-2.0.1-fix-configure-clang16.patch | 25 ++++++++++
 .../files/jpilot-2.0.1-fix-lto-type-mismatch.patch | 25 ++++++++++
 app-pda/jpilot/jpilot-2.0.1.ebuild                 | 55 ++++++++++++++++++++++
 app-pda/jpilot/metadata.xml                        |  7 +++
 5 files changed, 113 insertions(+)