autocmake/modules/cxx.cmake
2018-06-20 17:10:31 +02:00

48 lines
1.3 KiB
CMake

# (c) https://github.com/dev-cafe/autocmake/blob/master/AUTHORS.md
# licensed under BSD-3: https://github.com/dev-cafe/autocmake/blob/master/LICENSE
#.rst:
#
# Adds C++ support.
# Appends EXTRA_CXXFLAGS to CMAKE_CXX_FLAGS.
# If environment variable CXXFLAGS is set, then the CXXFLAGS are used
# and no other flags are used or appended.
#
# Variables used::
#
# EXTRA_CXXFLAGS
#
# Variables modified::
#
# CMAKE_CXX_FLAGS
#
# Environment variables used::
#
# CXXFLAGS
#
# autocmake.yml configuration::
#
# docopt:
# - "--cxx=<CXX> C++ compiler [default: g++]."
# - "--extra-cxx-flags=<EXTRA_CXXFLAGS> Extra C++ compiler flags [default: '']."
# define: "'-DCMAKE_CXX_COMPILER={0} -DEXTRA_CXXFLAGS=\"{1}\"'.format(arguments['--cxx'], arguments['--extra-cxx-flags'])"
if(NOT DEFINED CMAKE_CXX_COMPILER_ID)
message(FATAL_ERROR "CMAKE_CXX_COMPILER_ID variable is not defined!")
endif()
if(NOT CMAKE_CXX_COMPILER_WORKS)
message(FATAL_ERROR "CMAKE_CXX_COMPILER_WORKS is false!")
endif()
if(DEFINED EXTRA_CXXFLAGS)
if(NOT EXTRA_CXXFLAGS STREQUAL "")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${EXTRA_CXXFLAGS}")
endif()
endif()
if(DEFINED ENV{CXXFLAGS})
message(STATUS "CXXFLAGS is set to '$ENV{CXXFLAGS}'.")
set(CMAKE_CXX_FLAGS "$ENV{CXXFLAGS}")
endif()