cmake: add cmake support for the interface library

Author: ahoarau

CMakeLists.txt

@@ -0,0 +1,78 @@
+cmake_minimum_required(VERSION 3.22)
+
+project(
+    simde
+    DESCRIPTION
+        "Implementations of SIMD instruction sets for systems which don't natively support them."
+    HOMEPAGE_URL "https://github.com/simd-everywhere/simde"
+    LANGUAGES C CXX
+    VERSION 0.8.4
+)
+
+# Options
+option(SIMDE_TEST_CMAKE_PACKAGING "Test cmake packaging" ${PROJECT_IS_TOP_LEVEL})
+
+# The main simde library
+add_library(simde INTERFACE)
+add_library(simde::simde ALIAS simde)
+
+target_compile_features(simde INTERFACE c_std_99)
+
+target_include_directories(
+    simde
+    INTERFACE
+        $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
+        $<INSTALL_INTERFACE:include>
+)
+
+if(SIMDE_TEST_CMAKE_PACKAGING)
+    include(CTest)
+    enable_testing()
+    add_subdirectory(test/cmake-packaging)
+endif()
+
+include(GNUInstallDirs)
+
+# Install headers
+install(DIRECTORY simde DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
+
+# Export targets
+install(TARGETS simde EXPORT simde-targets)
+
+# Package Configuration
+include(CMakePackageConfigHelpers)
+
+write_basic_package_version_file(
+    ${CMAKE_CURRENT_BINARY_DIR}/simde-config-version.cmake
+    VERSION ${PROJECT_VERSION}
+    COMPATIBILITY SameMajorVersion
+)
+
+file(
+    WRITE
+    ${CMAKE_CURRENT_BINARY_DIR}/simde-config.cmake.in
+    "@PACKAGE_INIT@\n"
+    "include(\"\${CMAKE_CURRENT_LIST_DIR}/simde-config-targets.cmake\")\n"
+)
+
+configure_package_config_file(
+    ${CMAKE_CURRENT_BINARY_DIR}/simde-config.cmake.in
+    ${CMAKE_CURRENT_BINARY_DIR}/simde-config.cmake
+    INSTALL_DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/simde
+    NO_SET_AND_CHECK_MACRO
+    NO_CHECK_REQUIRED_COMPONENTS_MACRO
+)
+
+install(
+    FILES
+        ${CMAKE_CURRENT_BINARY_DIR}/simde-config.cmake
+        ${CMAKE_CURRENT_BINARY_DIR}/simde-config-version.cmake
+    DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/simde
+)
+
+install(
+    EXPORT simde-targets
+    FILE simde-config-targets.cmake
+    NAMESPACE simde::
+    DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/simde
+)