[# note: don't check for gcc first since some other compilers define __GNUC__
vendors="intel: __ICC,__ECC,__INTEL_COMPILER
ibm: __xlc__,__xlC__,__IBMC__,__IBMCPP__
pathscale: __PATHCC__,__PATHSCALE__
clang: __clang__
[# note: don't check for gcc first since some other compilers define __GNUC__
vendors="intel: __ICC,__ECC,__INTEL_COMPILER
ibm: __xlc__,__xlC__,__IBMC__,__IBMCPP__
pathscale: __PATHCC__,__PATHSCALE__
clang: __clang__