Segfault when attempting to run cgminer on ubuntu 10.04
I realize this question is 8 months old but this information may be of value to others seeking a resolution to a segfault as there seems to be no information available at all on the problem. The APP SDK seems to be incompatible with ATI legacy drivers.

The APP SDK is probably causing the segfault. I have a HD4770 and it was working with a pre-compiled copy of cgminer.

When I installed the APP SDK to compile sgminer everything seemed ok, sgminer compiled ok

However is gave me a segfault and when I tried to run cgminer that was working it too gave me a segfault.

After 3 days, I have been unable to restore things the way they were and undo the changes the APP SDK install made.

I fear that a complete OS reinstall will be my only solution.

Also. the flags '-march=native' enables special cryptographic instructions that are incompatible with AMD CPU's before Bulldozer.