https://bugs.kde.org/show_bug.cgi?id=444547
Bug ID: 444547
Summary: Build failure on Linux Clang targets with usage of
atomics
Product: extra-cmake-modules
Version: unspecified
Platform: Manjaro
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: ecm-bugs-n...@kde.org
Reporter: sh...@sdf.org
Target Milestone: ---
SUMMARY
The sources we use to check if the atomic libraries are present or not, by
default with the compiler are incomplete. Which results in the assumption that
the library is present at compile time, when the full version actually isn't.
This results in linking error:
ld.lld: error: undefined symbol: __atomic_is_lock_free
STEPS TO REPRODUCE
1. Use clang (x86_64-pc-linux-gnu)
2. Compile
https://invent.kde.org/frameworks/extra-cmake-modules/-/blob/master/modules/CheckAtomic.cmake#L44-50
without linking atomic
3. Compile https://invent.kde.org/-/snippets/1924 again without linking atomic
OBSERVED RESULT
Things work in the first case (step 2), but fail in second (step 3). Hence,
misdirecting the compiler.
ADDITIONAL INFORMATION
clang version: 12.0.1
Target: x86_64-pc-linux-gnu
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