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* [Bug c/55546] New: Static functions that are fully inlined can end up in the object file
@ 2012-11-30 13:04 rohan at rohanlean dot de
2012-12-03 11:49 ` [Bug middle-end/55546] " rguenth at gcc dot gnu.org
0 siblings, 1 reply; 2+ messages in thread
From: rohan at rohanlean dot de @ 2012-11-30 13:04 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55546
Bug #: 55546
Summary: Static functions that are fully inlined can end up in
the object file
Classification: Unclassified
Product: gcc
Version: 4.7.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: rohan@rohanlean.de
Created attachment 28838
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=28838
A rather minimal test-case for the bug.
If a static function has its address taken in the C code, but due to
optimisations the address is never used, then the function can still end up in
the object file. I have attached a file to demonstrate the bug. When I
compile it with -std=c11 -O3, the resulting executable will contain code for f,
even though it is not needed. (As an aside, if you add another function
similar to f, and call h with each of them, then gcc will not resolve things so
nicely at compile time and also emit code for h.)
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug middle-end/55546] Static functions that are fully inlined can end up in the object file
2012-11-30 13:04 [Bug c/55546] New: Static functions that are fully inlined can end up in the object file rohan at rohanlean dot de
@ 2012-12-03 11:49 ` rguenth at gcc dot gnu.org
0 siblings, 0 replies; 2+ messages in thread
From: rguenth at gcc dot gnu.org @ 2012-12-03 11:49 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55546
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Keywords| |missed-optimization
Last reconfirmed| |2012-12-03
Component|c |middle-end
CC| |hubicka at gcc dot gnu.org,
| |rguenth at gcc dot gnu.org
Ever Confirmed|0 |1
Known to fail| |4.8.0
Severity|normal |enhancement
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> 2012-12-03 11:49:41 UTC ---
That can trivially happen if the not usedness address-taken is discovered
too late by the compiler to temove the function.
Testcase confirmed.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2012-11-30 13:04 [Bug c/55546] New: Static functions that are fully inlined can end up in the object file rohan at rohanlean dot de
2012-12-03 11:49 ` [Bug middle-end/55546] " rguenth at gcc dot gnu.org
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