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Bug 861461 - net-irc/ninja-1.5.9_pre14-r2 fails to compile (lto): ninja.c:327:15: error: type of [-Werror=lto-type-mismatch]
Summary: net-irc/ninja-1.5.9_pre14-r2 fails to compile (lto): ninja.c:327:15: error: t...
Alias: None
Product: Gentoo Linux
Classification: Unclassified
Component: Current packages (show other bugs)
Hardware: All Linux
: Normal normal (vote)
Assignee: No maintainer - Look at if you want to take care of it
Keywords: PMASKED
Depends on:
Blocks: lto
  Show dependency tree
Reported: 2022-07-27 12:30 UTC by Agostino Sarubbo
Modified: 2024-05-08 20:35 UTC (History)
2 users (show)

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

build.log (build.log,97.25 KB, text/plain)
2022-07-27 12:30 UTC, Agostino Sarubbo

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Description Agostino Sarubbo gentoo-dev 2022-07-27 12:30:22 UTC

Issue: net-irc/ninja-1.5.9_pre14-r2 fails to compile (lto).
Discovered on: amd64 (internal ref: lto_tinderbox)

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

Here is a bit of explanation:

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.

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

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

- 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:
Comment 1 Agostino Sarubbo gentoo-dev 2022-07-27 12:30:24 UTC
Created attachment 794951 [details]

build log and emerge --info
Comment 2 Sam James archtester Gentoo Infrastructure gentoo-dev Security 2024-03-12 03:59:27 UTC
long-dead upstream, doesn't build w/ modern c (configure), autoreconf fails w/ autoconf-2.72, ...
Comment 3 Eli Schwartz 2024-05-08 01:57:20 UTC
For context, trying to eautoreconf successfully produces a script that then does this:

checking for hpux version... no
checking for ultrix... no
checking for sequent/ptx... ./configure: 4401: Syntax error: "}" unexpected (expecting "fi") is... not worth fixing. ;)
Comment 4 Larry the Git Cow gentoo-dev 2024-05-08 19:21:24 UTC
The bug has been referenced in the following commit(s):

commit 02752fdc603d04f173f3e3afc76436c8f8f60b88
Author:     Eli Schwartz <>
AuthorDate: 2024-05-08 02:01:28 +0000
Commit:     Sam James <>
CommitDate: 2024-05-08 19:19:29 +0000

    package.mask: Last rite net-irc/ninja
    Signed-off-by: Eli Schwartz <>
    Signed-off-by: Sam James <>

 profiles/package.mask | 7 +++++++
 1 file changed, 7 insertions(+)