cmake: install licenses of vendored libraries

CMakeLists.txt

@@ -331,6 +331,12 @@ if(SDLIMAGE_BUILD_SHARED_LIBS)
     set(CMAKE_POSITION_INDEPENDENT_CODE ON)
 endif()
 
+set(install_license_names)
+macro(register_license NAME FILE)
+  list(APPEND install_license_names ${NAME})
+  set(install_license_${NAME} "${FILE}")
+endmacro()
+
 set(INSTALL_EXTRA_TARGETS)
 set(INSTALL_EXTRA_CMAKE_MODULES)
 set(PC_LIBS)
@@ -380,6 +386,7 @@ if(SDLIMAGE_ZLIB)
         set(ZLIB_BUILD_EXAMPLES OFF CACHE BOOL "zlib examples" FORCE)
         sdl_check_project_in_subfolder(external/zlib zlib SDLIMAGE_VENDORED)
         add_subdirectory(external/zlib EXCLUDE_FROM_ALL)
+        register_license(zlib external/zlib/LICENSE)
         # PNG_BUILD_ZLIB variable is used by vendored libpng
         set(PNG_BUILD_ZLIB ON CACHE BOOL "libpng option to tell it should use 'our' vendored ZLIB library" FORCE)
         # ZLIB_INCLUDE_DIR variable is used by vendored libpng
@@ -413,6 +420,7 @@ if(SDLIMAGE_DAV1D)
         message(STATUS "${PROJECT_NAME}: Using vendored dav1d")
         set(BUILD_SHARED_LIBS ${SDLIMAGE_DAV1D_SHARED})
         add_subdirectory(external/dav1d EXCLUDE_FROM_ALL)
+        register_license(dav1d external/dav1d/COPYING)
         if(DAV1D_ASM AND (SDL_CPU_X64 OR SDL_CPU_X86))
             enable_language(ASM_NASM)
         endif()
@@ -451,6 +459,7 @@ if(SDLIMAGE_AOM)
           set(AOM_TARGET_CPU "aarch64")
         endif()
         add_subdirectory(external/aom EXCLUDE_FROM_ALL)
+        register_license(aom external/aom/LICENSE)
         set(AOM_LIBRARY aom)
         if(SDLIMAGE_AOM_SHARED OR NOT SDLIMAGE_BUILD_SHARED_LIBS)
             list(APPEND INSTALL_EXTRA_TARGETS aom)
@@ -479,6 +488,7 @@ if(SDLIMAGE_AVIF)
         set(BUILD_SHARED_LIBS ${SDLIMAGE_AVIF_SHARED})
         set(AOM_LIBRARIES "aom" CACHE STRING "aom libraries" FORCE)
         add_subdirectory(external/libavif EXCLUDE_FROM_ALL)
+        register_license(avif external/libavif/LICENSE)
         if(SDLIMAGE_AVIF_SHARED OR NOT SDLIMAGE_BUILD_SHARED_LIBS)
             list(APPEND INSTALL_EXTRA_TARGETS avif)
         endif()
@@ -555,6 +565,7 @@ if(SDLIMAGE_JPG)
             sdl_check_project_in_subfolder(external/jpeg libjpeg SDLIMAGE_VENDORED)
             set(BUILD_SHARED_LIBS ${SDLIMAGE_JPG_SHARED})
             add_subdirectory(external/jpeg EXCLUDE_FROM_ALL)
+            register_license(jpeg external/jpeg/COPYING)
             if(SDLIMAGE_JPG_SHARED OR NOT SDLIMAGE_BUILD_SHARED_LIBS)
                 list(APPEND INSTALL_EXTRA_TARGETS jpeg)
             endif()
@@ -625,6 +636,7 @@ if(SDLIMAGE_JXL)
         sdl_check_project_in_subfolder(external/libjxl libjxl SDLIMAGE_VENDORED)
         set(BUILD_SHARED_LIBS ${SDLIMAGE_JXL_SHARED})
         add_subdirectory(external/libjxl EXCLUDE_FROM_ALL)
+        register_license(jxl external/libjxl/LICENSE)
         if(SDLIMAGE_JXL_SHARED)
             set(jxl_lib jxl)
             set(jxl_install_libs brotlidec brotlicommon brotlienc jxl)
@@ -704,6 +716,7 @@ if(SDLIMAGE_PNG)
             set(SKIP_INSTALL_EXPORT TRUE)
             sdl_check_project_in_subfolder(external/libpng libpng SDLIMAGE_VENDORED)
             add_subdirectory(external/libpng EXCLUDE_FROM_ALL)
+            register_license(zlib external/libpng/LICENSE)
             if(SDLIMAGE_PNG_SHARED)
                 set(PNG_LIBRARY png_shared)
             else()
@@ -825,6 +838,7 @@ if(SDLIMAGE_TIF)
             sdl_check_project_in_subfolder(external/libtiff libtiff SDLIMAGE_VENDORED)
             set(BUILD_SHARED_LIBS ${SDLIMAGE_TIF_SHARED})
             add_subdirectory(external/libtiff EXCLUDE_FROM_ALL)
+            register_license(tiff external/libtiff/LICENSE.md)
             add_library(TIFF::TIFF ALIAS tiff)
             set(SDL2IMAGE_TIF_TARGET "TIFF::tiff")
             if(SDLIMAGE_TIF_SHARED OR NOT SDLIMAGE_BUILD_SHARED_LIBS)
@@ -885,6 +899,7 @@ if(SDLIMAGE_WEBP)
         sdl_check_project_in_subfolder(external/libwebp libwebp SDLIMAGE_VENDORED)
         set(BUILD_SHARED_LIBS ${SDLIMAGE_WEBP_SHARED})
         add_subdirectory(external/libwebp EXCLUDE_FROM_ALL)
+        register_license(webp external/libwebp/COPYING)
         target_include_directories(${sdl3_image_target_name} PRIVATE external/libwebp/src)
         add_library(WebP::webp ALIAS webp)
         add_library(WebP::webpdemux ALIAS webpdemux)
@@ -1055,6 +1070,10 @@ if(SDLIMAGE_INSTALL)
         COMPONENT library
     )
 
+    foreach(license_name IN LISTS install_license_names)
+        install(FILES "${install_license_${license_name}}" DESTINATION "${CMAKE_INSTALL_DATAROOTDIR}/licenses/${PROJECT_NAME}/optional" RENAME "LICENSE.${license_name}.txt")
+    endforeach()
+
     if(SDLIMAGE_INSTALL_CPACK)
         if(MSVC)
             set(CPACK_GENERATOR "ZIP")

build-scripts/release-info.json

@@ -160,7 +160,8 @@
           "bin/aom.dll",
           "bin/tiff.dll",
           "bin/libwebp.dll",
-          "bin/libwebpdemux.dll"
+          "bin/libwebpdemux.dll",
+          "share/licenses/SDL3_image/optional/*.txt"
         ]
       },
       "files-devel": {
@@ -175,7 +176,8 @@
           "bin/aom.dll",
           "bin/tiff.dll",
           "bin/libwebp.dll",
-          "bin/libwebpdemux.dll"
+          "bin/libwebpdemux.dll",
+          "share/licenses/SDL3_image/optional/*.txt"
         ]
       }
     },