[Bug target/61770] march=native detects corei7-avx on non avx cpu (Celeron 847)

["motorsense at gmx dot de" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61770

--- Comment #3 from motorsense at gmx dot de ---
Hi,

now gcc-4.8.3 is stable in Gentoo. It have the same issue.

gcc -march=native -E -v - </dev/null 2>&1 | grep cc1
 /usr/libexec/gcc/x86_64-pc-linux-gnu/4.8.3/cc1 -E -quiet -v -
-march=corei7-avx -mcx16 -msahf -mno-movbe -mno-aes -mpclmul -mpopcnt -mno-abm
-mno-lwp -mno-fma -mno-fma4 -mno-xop -mno-bmi -mno-bmi2 -mno-tbm -mno-avx
-mno-avx2 -msse4.2 -msse4.1 -mno-lzcnt -mno-rtm -mno-hle -mno-rdrnd -mno-f16c
-mno-fsgsbase -mno-rdseed -mno-prfchw -mno-adx -mfxsr -mno-xsave -mno-xsaveopt
--param l1-cache-size=32 --param l1-cache-line-size=64 --param
l2-cache-size=2048 -mtune=corei7-avx -fstack-protector

I do not know if there is an actual code generation error. I do not dare do
compile my complete sytem with "march=native".