[Help-gsl] GSL won't pass tests if I specify both -march=[any of core2 sandybridge ivybridge haswell] and -O2

[Hong Xu]

Hi everyone,

I have founded a very interesting problem: if I compile the gsl library 
with the CFLAGS of '-O2 -march=x86-64' or '-march=core2' (or one of 
sandybridge ivybridge haswell), all tests can pass. However, if I 
compile with CFLAGS='-O2 -march=[any of core2 sandybridge ivybridge 
haswell]', the tests won't pass. The file specfunc/testsuite.log is 
pasted in this link: http://pastebin.com/hcNhHz3b

This would limit the usage of the advantage of newer instructions, and 
potentially there may be a bug. Would anyone look into this?

Thanks!
Hong