[petsc-users] Specify -O2 for PETSc build in Windows

[Qin Lu]

Hello,

I was trying to build PETSc using Intel compiler with -O2 optimization option in Windows-7, but somehow it was override by -O3 during make. My configure options are as follows:

./configure --configModules=PETSc.Configure --optionsModule=PETSc.compilerOptions --with-cc="win32fe icl -O2" --with-fc="win32fe ifort -O2" --with-cxx="win32fe icl" --with-petsc-arch=arch-win64-release-with-hypre-o2 --prefix=/cygdrive/c/cygwin_cache/petsc-3.4.2-release-win64-with-hypre-o2 --with-blas-lapack-dir="/cygdrive/c/Program Files (x86)/intel/Compiler/11.1/051/mkl/em64t/lib" --with-mpi-dir="/cygdrive/c/Program Files/mpich2x64" --with-debugging=0 --with-x=0 --with-x11=0 --with-xt=0 --with-shared-libraries=0 --useThreads=0

Then the make gave messages such as: 
snesdnest.c
libfast in: /cygdrive/c/cygwin_cache/petsc-3.4.2/src/snes/interface/ftn-auto
icl: command line warning #10120: overriding '/O2' with '/O3'
 
How can I force the make to use -O2?
 
Many thanks for your suggestions,
Qin