cmake_modules/CompilerInfo.cmake

# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.
#
# Sets COMPILER_FAMILY to 'clang' or 'gcc'
# Sets COMPILER_VERSION to the version

include(CMakeDetermineCXXCompiler)
message("Running CompilerInfo.cmake")
execute_process(COMMAND env LANG=C "${CMAKE_CXX_COMPILER}" -v
                ERROR_VARIABLE COMPILER_VERSION_FULL)
message(${COMPILER_VERSION_FULL})

# clang on Linux and Mac OS X before 10.9
if("${COMPILER_VERSION_FULL}" MATCHES ".*clang version.*")
  set(COMPILER_FAMILY "clang")
  string(REGEX REPLACE ".*clang version ([0-9]+\\.[0-9]+).*" "\\1"
    COMPILER_VERSION "${COMPILER_VERSION_FULL}")

# gcc
elseif("${COMPILER_VERSION_FULL}" MATCHES ".*gcc version.*")
  set(COMPILER_FAMILY "gcc")
  string(REGEX REPLACE ".*gcc version ([0-9\\.]+).*" "\\1"
    COMPILER_VERSION "${COMPILER_VERSION_FULL}")
else()
  message(FATAL_ERROR "Unknown compiler. Version info:\n${COMPILER_VERSION_FULL}")
endif()
message("Selected compiler ${COMPILER_FAMILY} ${COMPILER_VERSION}")

# gcc (and some varieties of clang) mention the path prefix where system headers
# and libraries are located.
if("${COMPILER_VERSION_FULL}" MATCHES "Configured with: .* --prefix=([^ ]*)")
  set(COMPILER_SYSTEM_PREFIX_PATH ${CMAKE_MATCH_1})
  message("Selected compiler built with --prefix=${COMPILER_SYSTEM_PREFIX_PATH}")
endif()