c++ - Define preprocessor macro through CMake?

C++ - Define preprocessor macro through CMake?

In CMake, you can define preprocessor macros for your C++ project using the add_definitions or target_compile_definitions command. Here's how you can do it:

Using add_definitions:

# CMakeLists.txt # Add your source files here set(SOURCE_FILES main.cpp) # Define a preprocessor macro add_definitions(-DMY_MACRO_NAME) # Create the executable add_executable(MyExecutable ${SOURCE_FILES})

In this example, the add_definitions command is used to define the preprocessor macro -DMY_MACRO_NAME. This macro will be available globally for all source files.

Using target_compile_definitions:

# CMakeLists.txt # Add your source files here set(SOURCE_FILES main.cpp) # Create the executable add_executable(MyExecutable ${SOURCE_FILES}) # Define a preprocessor macro for the target target_compile_definitions(MyExecutable PRIVATE MY_MACRO_NAME)

In this example, the target_compile_definitions command is used to define the preprocessor macro MY_MACRO_NAME specifically for the MyExecutable target.

Choose the appropriate approach based on whether you want the macro to be available globally or specific to a target. Adjust the macro name and any other flags as needed for your project.

Examples

  1. "C++ CMake define preprocessor macro"

    add_definitions(-DMY_MACRO)
    • Adds a preprocessor macro (MY_MACRO) to the compilation using add_definitions.

  2. "C++ CMake conditional define preprocessor macro"

    if(CONDITION) add_definitions(-DCONDITIONAL_MACRO) endif()
    • Conditionally adds a preprocessor macro (CONDITIONAL_MACRO) based on a condition using add_definitions.

  3. "C++ CMake define preprocessor macro with value"

    add_definitions(-DMY_MACRO_WITH_VALUE=42)
    • Defines a preprocessor macro (MY_MACRO_WITH_VALUE) with a specific value using add_definitions.

  4. "C++ CMake define preprocessor macro for specific target"

    target_compile_definitions(MyTarget PRIVATE -DMY_MACRO_FOR_TARGET)
    • Defines a target-specific preprocessor macro (MY_MACRO_FOR_TARGET) using target_compile_definitions.

  5. "C++ CMake define preprocessor macro with string value"

    add_definitions(-DMY_MACRO_WITH_STRING="Hello, World!")
    • Defines a preprocessor macro (MY_MACRO_WITH_STRING) with a string value using add_definitions.

  6. "C++ CMake define preprocessor macro for debug build"

    if(CMAKE_BUILD_TYPE STREQUAL "Debug") add_definitions(-DDEBUG_MACRO) endif()
    • Adds a preprocessor macro (DEBUG_MACRO) only for the Debug build using add_definitions and checking the build type.

  7. "C++ CMake define multiple preprocessor macros"

    add_definitions(-DMACRO1 -DMACRO2)
    • Adds multiple preprocessor macros (MACRO1 and MACRO2) using a single add_definitions command.

  8. "C++ CMake define preprocessor macro with compiler flag"

    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DMY_MACRO_WITH_FLAG")
    • Appends a preprocessor macro (MY_MACRO_WITH_FLAG) using set and modifying CMAKE_CXX_FLAGS.

  9. "C++ CMake define preprocessor macro for specific source file"

    set_source_files_properties(file.cpp PROPERTIES COMPILE_DEFINITIONS MY_MACRO_FOR_FILE)
    • Defines a preprocessor macro (MY_MACRO_FOR_FILE) specifically for the source file file.cpp using set_source_files_properties.

  10. "C++ CMake define preprocessor macro with generator expression"

    add_definitions("$<$<CONFIG:Debug>: -DDEBUG_MACRO>")
    • Defines a preprocessor macro (DEBUG_MACRO) using a generator expression to conditionally apply it based on the build configuration.

More Tags

uitextviewdelegate restart mplcursors att autoplay searchview symfony stack http-status-code-500 instagram

More Programming Questions

More Trees & Forestry Calculators

More Financial Calculators

More Livestock Calculators

More Genetics Calculators