When did -Wmaybe-unitialized make its appearance?

[Markus Trippelsdorf]

On 2015.07.31 at 04:20 -0400, Jeffrey Walton wrote:
> We are catching a -Wmaybe-unitialized warning. We used Valgrind to
> determine its OK to suppress the warning. (No complaints about the
> warning itself; we'd rather know and be "better safe than sorry").
> 
> I'm having trouble determining when -Wmaybe-unitialized became
> available. The following is producing a warning hydra:
> 
> // vmac.cpp:404:93: warning: ‘al2’ may be used uninitialized in this function
> //    ... vmac.cpp:479:26: note: ‘al2’ was declared here
> // Valgrind cleared this finding.
> #if GCC_DIAGNOSTIC_AWARE
> # pragma GCC diagnostic push
> # pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
> #endif
> 
> and:
> 
> c++ -DNDEBUG -g2 -O3 -fPIC -march=native -Wall -Wextra -pipe -c vmac.cpp
> vmac.cpp:457:33: warning: unknown warning group '-Wmaybe-uninitialized', ignored
>       [-Wunknown-pragmas]
> # pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
>                                 ^
> 
> I checked the GCC release notes for 5, 4.9, 4.8. 4.7, 4.6, 4.5 and
> 4.4, but I did not see it discussed or mentioned.
> 
> When did -Wmaybe-unitialized make its appearance?

The svn or git repositories are publicly available. They should give you
the answer.

-- 
Markus