GCC 4.8.3 on SUSE also has the may_alias bug
GCC 4.8.3 on SUSE also has the may_alias bug

Therefore just don't use may_alias at all with GCC and -O0

Refs: gh-58
Signed-off-by: Matthias Kretz <372ea4eca737a13cd010ee806d4ce7b98ee71550@kde.org>

chr-engwer/Vc,VcDevel/Vc,VcDevel/Vc,VcDevel/Vc,chr-engwer/Vc,VcDevel/Vc,chr-engwer/Vc