tomlplusplus/cmake/project-is-top-level.cmake

# This variable is set by project() in CMake 3.21+
string(
    COMPARE EQUAL
    "${CMAKE_SOURCE_DIR}" "${PROJECT_SOURCE_DIR}"
    PROJECT_IS_TOP_LEVEL
)
Modernize the CMake build files (#102) List of things that this commit brings: * Makes the project `FetchContent` ready This is achieved by conditionally executing code that is only useful for a consumer of the project, such as examples. * Componentize the install rules Because this is a header-only library, its install rules should be categorized in a dev component (think foo-dev packages in apt). By assigning all install rules to a component, the project no longer clobbers the global component when vendored (see the previous point). * Provide an interface similar to the install interface when vendored This is achieved by adding SYSTEM to the include directories conditionally and only providing targets that are actually needed. * Make the project architecture independant This is achieved by setting the ARCH_INDEPENDENT argument when generating the version config file, which is available since CMake 3.14. This feature is intended to be used for header-only libraries. * Misc changes for trivial packaging The install rules are written in a way that allows package maintainers to trivially package the project. Co-authored-by: friendlyanon <friendlyanon@users.noreply.github.com> 2021-05-20 19:03:35 +00:00			`# This variable is set by project() in CMake 3.21+`
			`string(`
			`COMPARE EQUAL`
			`"${CMAKE_SOURCE_DIR}" "${PROJECT_SOURCE_DIR}"`
			`PROJECT_IS_TOP_LEVEL`
			`)`