Bug 286982 – sys-devel/gcc-4.4.1 -O1 optimization bug

• Status: RESOLVED FIXED
• Product: Gentoo Linux

[Description Jochen Schlick 2009-09-29 21:34:04 UTC]

the attached C++ test program triggers this optimization bug.


>  /usr/bin/gcc -lstdc++ test.cpp
>  ./a.out
val1=1234, val2=0
val1=1234, val2=1

--> OK


>  /usr/bin/gcc -lstdc++ -O1  test.cpp
> ./a.out
val1=3, val2=0
val1=3, val2=0


--> FAIL


>  /usr/bin/gcc -lstdc++ -O2  test.cpp
> ./a.out
val1=1234, val2=0
val1=1234, val2=1

--> OK

Reproducible: Always

[Comment 1 Jochen Schlick 2009-09-29 21:36:24 UTC]

Created attachment 205622 [details]
test program

[Comment 2 Jochen Schlick 2009-09-29 21:49:36 UTC]

This happens on intel 32bit and on AMD64 platforms with this compiler

[Comment 3 Rafał Mużyło 2009-09-29 22:23:51 UTC]

Looks like a valid bug, but it would be better to report it upstream.

[Comment 4 Jochen Schlick 2009-09-30 08:15:36 UTC]

same results on Fedora 11 with Fedora's gcc 4.4.1

[Comment 5 Jochen Schlick 2009-10-01 08:36:31 UTC]

https://bugzilla.redhat.com/show_bug.cgi?id=526428

seems to work with the current gcc-4.4.1 in Fedora RawHide. Our Gentoo gcc-4.4.1 is too old.

[Comment 6 Rafał Mużyło 2009-10-18 05:15:58 UTC]

Please don't whine (without a good reason).

Anyway, seems fixed in gcc 4.4.2.

[Comment 7 Ryan Hill (RETIRED) 2009-10-18 09:53:52 UTC]

Fixed in 4.4.2.