您提供的输出表明 CMake 试图对您有所帮助。如果它对你的口味来说太冗长,也许最简单的减少它的方法是将它捕获到一个变量中,然后检查它。
您可以将下面的示例 CMake 脚本另存为detect_cxx_compiler.cmake
,并使用 调用该脚本cmake -P detect_cxx_compiler.cmake
。代码的编写方式旨在帮助 CMake 初学者,而不是为了小尺寸或处理效率。
cmake_minimum_required(VERSION 2.8.5 FATAL_ERROR)
cmake_policy(VERSION 2.8.5)
# This cmake script (when saved as detect_cxx_compiler.cmake) is invoked by:
#
# cmake -P detect_cxx_compiler.cmake
#
# It is written for clarity, not brevity.
# First make a new directory, so that we don't mess up the current one.
execute_process(
COMMAND ${CMAKE_COMMAND} -E make_directory detection_area
WORKING_DIRECTORY .
)
# Here, we generate a key file that CMake needs.
execute_process(
COMMAND ${CMAKE_COMMAND} -E touch CMakeLists.txt
WORKING_DIRECTORY detection_area
)
# Have CMake check the basic configuration. The output is
# actually in the form that you posted in your question, but
# instead of displaying it onscreen, we save it to a variable
# so that we can select only parts of it to print later.
execute_process(
COMMAND ${CMAKE_COMMAND} --check-system-vars
OUTPUT_VARIABLE the_output
OUTPUT_STRIP_TRAILING_WHITESPACE
WORKING_DIRECTORY detection_area
)
# Eliminate the directory, including all of the files within it that
# CMake created.
execute_process(
COMMAND ${CMAKE_COMMAND} -E remove_directory detection_area
WORKING_DIRECTORY .
)
# Here, you have the entire message captured as a variable.
# Uncomment this next line to convince yourself of this.
#message(STATUS "the_output = |${the_output}|.")
# Here, we search the message to see if the C++ compiler was found or not,
# and print an arbitrary message accordingly.
string(FIND "${the_output}" "CMAKE_CXX_COMPILER-NOTFOUND" scan_result)
#message(STATUS "scan_result = |${scan_result}|.")
if(NOT(-1 EQUAL "${scan_result}"))
message(FATAL_ERROR "A C++ compiler was not detected.")
endif()
message(STATUS "A C++ compiler was detected.")