How Can I Modernize Compiler Flag Management in My Cross-Platform CMake Project?

Modernizing Compiler Flag Management in CMake Cross-Platform Projects

A Comprehensive Solution to Compilation Configuration Pain Points

You've encountered some challenges in managing compiler options in your CMake cross-platform project. Let's delve into a modernized approach that addresses your concerns and provides a robust solution.

1. Declutter Your CMake File with Advanced Features

Instead of manually setting CMAKE_CXX_FLAGS, consider utilizing the following techniques:

• "generator expressions": Flexibly append conditions to compiler options dynamically (e.g., for different compilers or configurations).
• add_compile_options(): Concatenate options cleanly and avoid unnecessary semicolons.

For example, using generator expressions:

<code class="cmake">string(APPEND _opts
    "$<if:>,
        "/W4;$:/O2>",
        "-Wall;-Wextra;-Werror;
            $:-O3>"
            "$:-stdlib=libc++>"
    ">"
)
add_compile_options("${_opts}")</if:></code>

2. Leverage Target-Specific Features for Enhanced Control

Replace explicit C standard specification with:

<code class="cmake">target_compile_features(HelloWorld PUBLIC cxx_lambda_init_captures)</code>

This specifies the exact C feature dependencies of your project, handling compiler compatibility and providing clear error messages for unsupported features.

3. Achieve Multiple Targets in One Directory Using Wrappers

For multi-target builds, utilize a wrapper script or an IDE with multi-configuration support.

Additional Considerations:

• Generator expressions require CMake version >= 3.8.
• Generator expressions must be written in a single line. Consider using string(APPEND) to improve readability.
• Visual Studio 2017's CMake support allows you to integrate multiple compilers and configurations into a single workspace.

This updated approach provides a modern and efficient way to manage compiler options and configurations in your cross-platform CMake projects.

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