Bug 43396

Summary: -Wflag checks give false positives with clang
Product: systemd Reporter: Michał Górny <mgorny>
Component: generalAssignee: Lennart Poettering <lennart>
Status: RESOLVED NOTOURBUG QA Contact:
Severity: trivial    
Priority: medium    
Version: unspecified   
Hardware: Other   
OS: All   
Whiteboard:
i915 platform: i915 features:

Description Michał Górny 2011-11-30 15:23:02 UTC 
clang treats invalid -W options as warnings so all -W checks succeed with it. The result is:

^[[0;1;35mwarning: ^[[0m^[[1munknown warning option '-Wlogical-op' [-Wunknown-warning-option]^[[0m

for each file.

I suggest improving the test by either:

1) checking compiler output as well -- if compiler does not output any messages (warnings) then the option is supported,
2) check for -Werror first and then append it for other checks.
Comment 1 Lennart Poettering 2012-07-20 14:07:01 UTC 
I am pretty sure that this is something to fix in clang, not systemd.
Comment 2 Lennart Poettering 2012-09-13 18:06:02 UTC 
Closing, since I beliebe this should be fixed in clang, not systemd.

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