From 609845bc9eb081af1115bcc3a09984daef27b108 Mon Sep 17 00:00:00 2001
From: Anonymous Maarten <anonymous.maarten@gmail.com>
Date: Thu, 29 Oct 2020 23:23:50 +0100
Subject: [PATCH] cmake more work

---
 CMakeLists.txt          | 66 ++++++++++++++++++++++++++++++++++++-----
 kissfft-config.cmake.in | 12 ++++++++
 2 files changed, 70 insertions(+), 8 deletions(-)
 create mode 100644 kissfft-config.cmake.in

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6a09110..3629c03 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,16 +1,56 @@
-cmake_minimum_required(VERSION 2.8)
-project(kissfft)
+file(READ Makefile _MAKEFILE_CONTENTS)
+string(REGEX MATCH "KFVER=([0-9]+)\n" KFVER_MATCH "${_MAKEFILE_CONTENTS}")
+if(NOT KFVER_MATCH)
+    message(FATAL_ERROR "Cannot extract version from Makefile")
+endif()
+set(MAKEFILE_EXTRACTED_VERSION "${CMAKE_MATCH_1}")
+
+cmake_minimum_required(VERSION 3.3)
+project(kissfft VERSION "${MAKEFILE_EXTRACTED_VERSION}")
+
+option(KISSFFT_SIMD "Build kissfft with SIMD")
+option(KISSFFT_FLOAT "Build kissfft with float type" ON)
+
+set(KISSFFT_FIXED_WIDTH_VALID 16 32)
+set(KISSFFT_FIXED_WIDTH "16" CACHE STRING "Width of kissfft fixed integer (16/32)")
+set_property(CACHE KISSFFT_FIXED_WIDTH PROPERTY STRINGS ${KISSFFT_FIXED_WIDTH_VALID})
+if(NOT KISSFFT_FIXED_WIDTH IN_LIST KISSFFT_FIXED_WIDTH_VALID)
+    message(FATAL_ERROR "KISSFFT_FIXED_WIDTH must be 16 or 32")
+endif()
+
+set(KISSFFT_FLOAT_TYPE_VALID float double)
+set(KISSFFT_FLOAT_TYPE "float" CACHE STRING "Floating type of kissfft (float/double)")
+set_property(CACHE KISSFFT_FLOAT_TYPE PROPERTY STRINGS ${KISSFFT_FLOAT_TYPE_VALID})
+if(NOT KISSFFT_FLOAT_TYPE IN_LIST KISSFFT_FLOAT_TYPE_VALID)
+    message(FATAL_ERROR "KISSFFT_FLOAT_TYPE must be float or double")
+endif()
 
 add_library(kissfft
   kiss_fft.c)
 add_library(kissfft::kissfft ALIAS kissfft)
 
 target_include_directories(kissfft PUBLIC
-    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
+    $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}>
     $<INSTALL_INTERFACE:.>)
 
+set(KISSFFT_SUFFIX)
+if(KISSFFT_SIMD)
+    target_compile_definitions(kissfft PUBLIC USE_SIMD)
+    set(KISSFFT_SUFFIX "${KISSFFT_SUFFIX}_simd")
+endif()
+if(KISSFFT_FLOAT)
+    target_compile_definitions(kissfft PUBLIC kiss_fft_scalar=${KISSFFT_FLOAT_TYPE})
+    set(KISSFFT_SUFFIX "${KISSFFT_SUFFIX}_${KISSFFT_FLOAT_TYPE}")
+else()
+    target_compile_definitions(kissfft PUBLIC KISSFFT_FIXED_POINT=${KISSFFT_FIXED_WIDTH})
+    set(KISSFFT_SUFFIX "${KISSFFT_SUFFIX}_int${KISSFFT_FIXED_WIDTH}")
+endif()
+
 set_target_properties(kissfft PROPERTIES
-    DEFINE_SYMBOL KISS_FFT_BUILD)
+    OUTPUT_NAME "kissfft${KISSFFT_SUFFIX}"
+    DEFINE_SYMBOL KISS_FFT_BUILD
+    EXPORT_NAME "kissfit${KISSFFT_SUFFIX}"
+    SOVERSION ${PROJECT_VERSION})
 if(BUILD_SHARED_LIBS)
     target_compile_definitions(kissfft PUBLIC KISS_FFT_SHARED)
     set_target_properties(kissfft PROPERTIES
@@ -21,11 +61,21 @@ option(KISSFFT_INSTALL "Enable kissfft install" ON)
 if (KISSFFT_INSTALL)
     include(GNUInstallDirs)
     install(TARGETS kissfft EXPORT kissfft
-        ARCHIVE DESTINATION "${CMAKE_INSTALL_BINDIR}"
-        LIBRARY DESTINATION "${CMAKE_INSTALL_BINDIR}"
+        ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}"
+        LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}"
         RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}")
     install(FILES "kiss_fft.h" DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}")
-    install(EXPORT kissfft DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}"
+
+    set(KISSFFT_INSTALL_CMAKE "${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}" CACHE FILEPATH "Install destination of kissfft cmake modules")
+    mark_as_advanced(KISSFFT_INSTALL_CMAKE)
+
+    install(EXPORT kissfft DESTINATION "${KISSFFT_INSTALL_CMAKE}"
         NAMESPACE "kissfft::"
-        FILE "${PROJECT_NAME}-config.cmake")
+        FILE "${PROJECT_NAME}${KISSFFT_SUFFIX}-targets.cmake")
+    include(CMakePackageConfigHelpers)
+    configure_package_config_file(kissfft-config.cmake.in kissfft-config.cmake
+        INSTALL_DESTINATION "${KISSFFT_INSTALL_CMAKE}")
+    write_basic_package_version_file(kissfft-config-version.cmake COMPATIBILITY AnyNewerVersion)
+    install(FILES "${CMAKE_CURRENT_BINARY_DIR}/kissfft-config.cmake" "${CMAKE_CURRENT_BINARY_DIR}/kissfft-config-version.cmake"
+        DESTINATION "${KISSFFT_INSTALL_CMAKE}")
 endif()
diff --git a/kissfft-config.cmake.in b/kissfft-config.cmake.in
new file mode 100644
index 0000000..8522c1d
--- /dev/null
+++ b/kissfft-config.cmake.in
@@ -0,0 +1,12 @@
+@PACKAGE_INIT@
+
+# Load information for all configured kissfft
+get_filename_component(_DIR "${CMAKE_CURRENT_LIST_FILE}" PATH)
+file(GLOB CONFIG_FILES "${_DIR}/kissfft*-targets.cmake")
+foreach(f ${CONFIG_FILES})
+  include(${f})
+endforeach()
+
+set(KISSFFT_VERSION @kissfft_VERSION@)
+
+check_required_components(kissfft)