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* [Bug c/105362] New: Improvement: diagnose undefined behavior in preprocessing directives
@ 2022-04-24 13:50 pavel.morozkin at gmail dot com
2022-04-24 16:45 ` [Bug preprocessor/105362] " pinskia at gcc dot gnu.org
2022-04-25 21:59 ` pavel.morozkin at gmail dot com
0 siblings, 2 replies; 3+ messages in thread
From: pavel.morozkin at gmail dot com @ 2022-04-24 13:50 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105362
Bug ID: 105362
Summary: Improvement: diagnose undefined behavior in
preprocessing directives
Product: gcc
Version: 11.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: pavel.morozkin at gmail dot com
Target Milestone: ---
#if 1 << -1
#endif
$ gcc -std=c11 -pedantic -Wall -Wextra -O3 -c
Expected diagnostics:
warning: left shift count is negative [-Wshift-count-negative]
Actual diagnostics:
<nothing>
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug preprocessor/105362] Improvement: diagnose undefined behavior in preprocessing directives
2022-04-24 13:50 [Bug c/105362] New: Improvement: diagnose undefined behavior in preprocessing directives pavel.morozkin at gmail dot com
@ 2022-04-24 16:45 ` pinskia at gcc dot gnu.org
2022-04-25 21:59 ` pavel.morozkin at gmail dot com
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu.org @ 2022-04-24 16:45 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105362
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
Component|c |preprocessor
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
The preprocessor has its own constant folding and diagnostics
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug preprocessor/105362] Improvement: diagnose undefined behavior in preprocessing directives
2022-04-24 13:50 [Bug c/105362] New: Improvement: diagnose undefined behavior in preprocessing directives pavel.morozkin at gmail dot com
2022-04-24 16:45 ` [Bug preprocessor/105362] " pinskia at gcc dot gnu.org
@ 2022-04-25 21:59 ` pavel.morozkin at gmail dot com
1 sibling, 0 replies; 3+ messages in thread
From: pavel.morozkin at gmail dot com @ 2022-04-25 21:59 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105362
--- Comment #2 from Pavel M <pavel.morozkin at gmail dot com> ---
I do believe that evaluation of constant expressions in conditional inclusion
is done according to the rules of constant expressions ("except that ...", see
C11, 6.10.1/1). Hence, I expect the same diagnostics in all the places where
constant expressions may be used.
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2022-04-25 21:59 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2022-04-24 13:50 [Bug c/105362] New: Improvement: diagnose undefined behavior in preprocessing directives pavel.morozkin at gmail dot com
2022-04-24 16:45 ` [Bug preprocessor/105362] " pinskia at gcc dot gnu.org
2022-04-25 21:59 ` pavel.morozkin at gmail dot com
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