https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65178
--- Comment #16 from Leon Winter ---
I just checked again with gcc 9.2.1 and the issue disappeared.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65178
--- Comment #14 from Leon Winter ---
I am not sure how smart he diagnostic of GCC is supposed to be it seems that
the source base of GCC itself has fallen victim to the false warning.
The following commit fixes a -Wmaybe-uninitialized warning:
c
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65178
--- Comment #13 from Leon Winter ---
The incorrect warning is only displayed when using an optimization level better
than none (-O0) (this applies to your testcase and my real-world code). Your
minimized test case is already wrongfully blamed by
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65178
--- Comment #12 from Leon Winter ---
> Are you saying that GCC 4.9 does not warn? That would be surprising and a
> regression. If you could find the revision that started warning, that would
> be helpful.
Funny you would ask, it turns out that o
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65178
--- Comment #11 from Leon Winter ---
Created attachment 37855
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=37855&action=edit
Current test case
gcc version 4.9.3
$ gcc -std=gnu99 -O1 -Wall -Wextra -o foo main.c
$ gcc -std=gnu99 -O2 -Wal
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65178
--- Comment #9 from Leon Winter ---
> If you declare it outside the loop body, gcc generates exactly the same code
> for a 'for' and a 'do-while'.
You are right. When I did the testing, I mistakenly left out "-O1" or such so I
did not see the wa
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65178
--- Comment #7 from Leon Winter ---
> #pragma GCC diagnostic ignored "-Wuninitialized"
>
> is your friend.
We do like this warning and threat it as an error as such situations normally
are a mistake which could lead to errors later on this swit
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63278
Leon Winter changed:
What|Removed |Added
CC||winter-...@bfw-online.de
--- Comment #4
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65178
--- Comment #5 from Leon Winter ---
Still persists.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65178
Leon Winter changed:
What|Removed |Added
Version|5.0 |5.2.1
--- Comment #4 from Leon Winter ---
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65178
Leon Winter changed:
What|Removed |Added
Version|4.9.1 |5.0
--- Comment #3 from Leon Winter ---
L
: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: winter-...@bfw-online.de
Created attachment 34845
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34845&action=edit
Testcase
This program incorrectly warns about an uninitialized variable.
If on
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