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* [Bug c/56523] New: -Wunitialized is described to be enabled -Wall
@ 2013-03-04 16:03 corentinjabot at gmail dot com
2013-03-04 16:16 ` [Bug c/56523] -Wunitialized is described to be enabled by -Wall paolo.carlini at oracle dot com
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: corentinjabot at gmail dot com @ 2013-03-04 16:03 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56523
Bug #: 56523
Summary: -Wunitialized is described to be enabled -Wall
Classification: Unclassified
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: corentinjabot@gmail.com
The online docs ( http://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html ) and
the gcc 4.7 man page state incorrectly that -Wall enable -Wunitialized.
The docs also state -Wunitialized is enable by -Wextra, and that is the
observed and correct behaviour.
^ permalink raw reply [flat|nested] 4+ messages in thread* [Bug c/56523] -Wunitialized is described to be enabled by -Wall 2013-03-04 16:03 [Bug c/56523] New: -Wunitialized is described to be enabled -Wall corentinjabot at gmail dot com @ 2013-03-04 16:16 ` paolo.carlini at oracle dot com 2013-03-04 17:33 ` corentinjabot at gmail dot com 2013-03-04 17:44 ` paolo.carlini at oracle dot com 2 siblings, 0 replies; 4+ messages in thread From: paolo.carlini at oracle dot com @ 2013-03-04 16:16 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56523 --- Comment #1 from Paolo Carlini <paolo.carlini at oracle dot com> 2013-03-04 16:16:16 UTC --- On which basis do you think it doesn't? In practice, for a stupid example like the below, with -Wall: int main() { int a; return a; } I get: test.c: In function ‘main’: test.c:4:3: warning: ‘a’ is used uninitialized in this function [-Wuninitialized] ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c/56523] -Wunitialized is described to be enabled by -Wall 2013-03-04 16:03 [Bug c/56523] New: -Wunitialized is described to be enabled -Wall corentinjabot at gmail dot com 2013-03-04 16:16 ` [Bug c/56523] -Wunitialized is described to be enabled by -Wall paolo.carlini at oracle dot com @ 2013-03-04 17:33 ` corentinjabot at gmail dot com 2013-03-04 17:44 ` paolo.carlini at oracle dot com 2 siblings, 0 replies; 4+ messages in thread From: corentinjabot at gmail dot com @ 2013-03-04 17:33 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56523 --- Comment #2 from corentinjabot at gmail dot com 2013-03-04 17:33:26 UTC --- Actually after a few more test it works correctly but the statement "This enables some extra warning flags that are not enabled by -Wall." is confusing since the to set of options overlap. I also tested with the following c++ snippet: #include <iostream> class A { public: A() {} bool foo; void bar() { if(foo) std::cout << "Foo\n"; } }; int main () { A a; a.bar(); return 0; } The uninitialized variable is detected only with -O1. It is vaguely documented but that behavior seems quite odd and unexpected when you are not aware of it. ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c/56523] -Wunitialized is described to be enabled by -Wall 2013-03-04 16:03 [Bug c/56523] New: -Wunitialized is described to be enabled -Wall corentinjabot at gmail dot com 2013-03-04 16:16 ` [Bug c/56523] -Wunitialized is described to be enabled by -Wall paolo.carlini at oracle dot com 2013-03-04 17:33 ` corentinjabot at gmail dot com @ 2013-03-04 17:44 ` paolo.carlini at oracle dot com 2 siblings, 0 replies; 4+ messages in thread From: paolo.carlini at oracle dot com @ 2013-03-04 17:44 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56523 Paolo Carlini <paolo.carlini at oracle dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution| |WORKSFORME --- Comment #3 from Paolo Carlini <paolo.carlini at oracle dot com> 2013-03-04 17:43:18 UTC --- That some warnings are only emitted when optimizing is well known, and discussed in many places. ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2013-03-04 17:44 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2013-03-04 16:03 [Bug c/56523] New: -Wunitialized is described to be enabled -Wall corentinjabot at gmail dot com 2013-03-04 16:16 ` [Bug c/56523] -Wunitialized is described to be enabled by -Wall paolo.carlini at oracle dot com 2013-03-04 17:33 ` corentinjabot at gmail dot com 2013-03-04 17:44 ` paolo.carlini at oracle dot com
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