casa-mp-base

Respect user-supplied CFLAGS and CXXFLAGS, and do not try to use -O9

which clang does not like.

--- configure.ac.orig   2002-08-20 00:58:13.000000000 -0500

+++ configure.ac    2016-10-24 09:19:02.000000000 -0500

@@ -82,8 +82,8 @@

 dnl check gcc

 dnl

 if test -n "$GCC"; then

-   CFLAGS="-Wall -O9 -funroll-all-loops -finline -ffast-math"

-   CXXFLAGS="-Wall -O9 -funroll-all-loops -finline -ffast-math"

+   CFLAGS="$CFLAGS -Wall -funroll-all-loops -finline -ffast-math"

+   CXXFLAGS="$CXXFLAGS -Wall -funroll-all-loops -finline -ffast-math"

 fi

 # On Intel systems with gcc, we may need to compile with -mieee-fp to