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This is my full CMakeLists.txt file:

set(CMAKE_BUILD_TYPE Release) set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -Wshadow") set(PROJECT sample) project(${PROJECT}) set(HEADERS Main.h ) set(SOURCES Main.cpp ) # Add souce file to project for compile add_executable (${PROJECT} ${HEADERS} ${SOURCES}) target_link_libraries( ${PROJECT} )

But, in Makefile i don't seek substring "-Wall" and other option from CMAKE_CXX_FLAGS.

Why?

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1 Answer 1

Reset to default
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The CMAKE_CXX_FLAGS variable is initially set with the project() command. Move the set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ...") after the project() command.

From CMake Toolchains - Languages documenation:

Languages are enabled by the project() command. Language-specific built-in variables, such as CMAKE_CXX_COMPILER, CMAKE_CXX_COMPILER_ID etc are set by invoking the project() command. If no project command is in the top-level CMakeLists file, one will be implicitly generated. By default the enabled languages are C and CXX.

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2 Comments

Thanks, this is work. But where in official documentation told about this feature (after the project)? I found project page cmake.org/cmake/help/v3.10/command/project.html but there is nothing said about the CXX option and project.
@Xintrea It's part of the CMake Toolchains - Languages documentation. I'll add this to my answer.

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