[CMake] Test for ICC

[James Bigler]

> but I want to specifically look for the intel compiler. I guess I  
> could just exec icc and see what comes back. Checking for $CC=icc  
> might be useful, but mine is set to /opt/intel/cc/10.0.023/bin/icc..
>
> Any suggestions would be good.

I use this:

SET(MANTA_COMPILER_NAME_REGEXPR "icc.*$")

IF(NOT CMAKE_COMPILER_IS_GNUCC)
   # This regular expression also matches things like icc-9.1
   IF   (CMAKE_C_COMPILER MATCHES ${MANTA_COMPILER_NAME_REGEXPR})
     SET(USING_ICC TRUE)
   ENDIF(CMAKE_C_COMPILER MATCHES ${MANTA_COMPILER_NAME_REGEXPR})
ELSE(NOT CMAKE_COMPILER_IS_GNUCC)
   SET(USING_GCC TRUE)
ENDIF(NOT CMAKE_COMPILER_IS_GNUCC)

SET(MANTA_COMPILER_NAME_REGEXPR "icpc.*$")
IF(NOT CMAKE_COMPILER_IS_GNUCXX)
   IF   (CMAKE_CXX_COMPILER MATCHES ${MANTA_COMPILER_NAME_REGEXPR})
     SET(USING_ICPC TRUE)

     EXEC_PROGRAM(${CMAKE_CXX_COMPILER}
       ARGS --version
       OUTPUT_VARIABLE TEMP)

     STRING(REGEX MATCH "([0-9\\.]+)"
       INTEL_COMPILER_VERSION
       ${TEMP})

     MARK_AS_ADVANCED(INTEL_COMPILER_VERSION)
   ENDIF(CMAKE_CXX_COMPILER MATCHES ${MANTA_COMPILER_NAME_REGEXPR})
ELSE(NOT CMAKE_COMPILER_IS_GNUCXX)
   SET(USING_GPP TRUE)
ENDIF(NOT CMAKE_COMPILER_IS_GNUCXX)