[petsc-users] petsc gcc intel and compilerflags

[Manfred Gratt]

Hello,

when I compile petsc with --with-debugging=0 with gcc and icc in 
configure there are different optimization flags set depending on 
compiler. So is with gcc -O set wich means -O1 optimization. While with 
icc -O3 optimisation is set. Is there a reason only icc gets the high 
performance flag while gcc not? Are there any problems when some 
optimizations are activated on gcc?

with greetings
Manfred