Fix broken builds and missing install targets

This commit rewrites the existing CMake files so that they
export targets and install required headers in a way that allows
the application and libraries to install and be idiomatically
integrated with other projects.

Included third-party code now builds object libraries that are
embedded in the final archives and public headers from those
third-party libraries are installed in subdirectories of the
embedding libraries.

This commit also fixes compiling the drawdance and dpgles2
targets and the emscripten cross-compilation, which were all
broken.

Across CMake files, verbose copyright headers are replaced with
SPDX identifiers plus an AUTHORS.txt for standard attribution.

Finally, this commit removes clang-format from CMake, since this
cannot work with all generators according to
<https://discourse.cmake.org/t/clang-format-integration/3358/4>
and should go into a git pre-commit hook instead or integrated in
the IDE.

3rdparty/CMakeLists.txt

@@ -1,25 +1,7 @@
-# Copyright (c) 2022 askmeaboutloom
-#
-# Permission is hereby granted, free of charge, to any person obtaining a copy
-# of this software and associated documentation files (the "Software"), to deal
-# in the Software without restriction, including without limitation the rights
-# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-# copies of the Software, and to permit persons to whom the Software is
-# furnished to do so, subject to the following conditions:
-#
-# The above copyright notice and this permission notice shall be included in all
-# copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-# SOFTWARE.
+# SPDX-License-Identifier: MIT
 
 if(BUILD_APPS)
-    add_library(lua STATIC lua/lapi.c lua/lapi.h lua/lauxlib.c lua/lauxlib.h
+    add_library(lua OBJECT lua/lapi.c lua/lapi.h lua/lauxlib.c lua/lauxlib.h
                 lua/lbaselib.c lua/lcode.c lua/lcode.h lua/lcorolib.c lua/lctype.c
                 lua/lctype.h lua/ldblib.c lua/ldebug.c lua/ldebug.h lua/ldo.c
                 lua/ldo.h lua/ldump.c lua/lfunc.c lua/lfunc.h lua/lgc.c lua/lgc.h
@@ -32,26 +14,32 @@ if(BUILD_APPS)
                 lua/ltm.h lua/lua.h lua/luaconf.h lua/lualib.h lua/lundump.c
                 lua/lundump.h lua/lutf8lib.c lua/lvm.c lua/lvm.h lua/lzio.c
                 lua/lzio.h )
-    set_dp_target_properties(lua NO_CLANG_TIDY NO_WARNINGS)
-    target_include_directories(lua INTERFACE "${CMAKE_CURRENT_LIST_DIR}/lua")
+    target_include_directories(lua SYSTEM PUBLIC
+        $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/lua>
+        $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
+    )
 
-    add_clang_format_files(dpgles2/gles2_inc.h)
     add_library(dpgles2 INTERFACE)
-    set_dp_target_properties(dpgles2 NO_ASAN NO_CLANG_TIDY NO_WARNINGS)
-    target_include_directories(dpgles2 INTERFACE "${CMAKE_CURRENT_LIST_DIR}/dpgles2")
+    target_include_directories(dpgles2 SYSTEM INTERFACE "dpgles2")
 
-    add_library(imgui STATIC imgui/imconfig.h imgui/imgui.cpp imgui/imgui_demo.cpp
+    add_library(imgui OBJECT imgui/imconfig.h imgui/imgui.cpp imgui/imgui_demo.cpp
                 imgui/imgui_draw.cpp imgui/imgui.h imgui/imgui_impl_opengl3.cpp
                 imgui/imgui_impl_opengl3.h imgui/imgui_impl_sdl.cpp
                 imgui/imgui_impl_sdl.h imgui/imgui_internal.h imgui/imgui_tables.cpp
                 imgui/imgui_widgets.cpp imgui/imstb_rectpack.h imgui/imstb_textedit.h
                 imgui/imstb_truetype.h)
-    set_dp_target_properties(imgui CXX NO_CLANG_TIDY NO_WARNINGS)
     target_compile_definitions(imgui PRIVATE IMGUI_IMPL_OPENGL_ES2)
-    target_include_directories(imgui INTERFACE "${CMAKE_CURRENT_LIST_DIR}/imgui")
-    target_link_libraries(imgui PUBLIC dpgles2 SDL2::SDL2)
+    target_include_directories(imgui SYSTEM PUBLIC
+        $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/imgui>
+        $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
+    )
+    target_link_libraries(imgui PRIVATE dpgles2 SDL2::SDL2)
+    # https://github.com/libsdl-org/SDL/issues/3657
+    if(APPLE AND SDL2_VERSION VERSION_LESS 2.0.13)
+        target_compile_definitions(imgui PRIVATE _DARWIN_C_SOURCE)
+    endif()
 
-    add_library(uriparser STATIC uriparser/UriCommon.c uriparser/UriCommon.h
+    add_library(uriparser OBJECT uriparser/UriCommon.c uriparser/UriCommon.h
                 uriparser/UriCompare.c uriparser/UriEscape.c uriparser/UriFile.c
                 uriparser/UriIp4.c uriparser/UriIp4Base.c uriparser/UriIp4Base.h
                 uriparser/UriMemory.c uriparser/UriMemory.h
@@ -65,27 +53,32 @@ if(BUILD_APPS)
                 uriparser/include/uriparser/UriDefsAnsi.h
                 uriparser/include/uriparser/UriDefsConfig.h
                 uriparser/include/uriparser/UriIp4.h)
-    set_dp_target_properties(uriparser NO_CLANG_TIDY NO_WARNINGS)
     target_compile_definitions(uriparser PUBLIC URI_NO_UNICODE)
-    target_include_directories(
-            uriparser PRIVATE "${CMAKE_CURRENT_LIST_DIR}/uriparser")
-    target_include_directories(
-            uriparser PUBLIC "${CMAKE_CURRENT_LIST_DIR}/uriparser/include")
+    target_include_directories(uriparser SYSTEM
+        PUBLIC
+            $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/uriparser/include>
+            $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
+        PRIVATE
+            $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/uriparser>
+    )
 endif()
 
-add_library(parson STATIC parson/parson.c parson/parson.h)
-set_dp_target_properties(parson NO_CLANG_TIDY NO_WARNINGS)
-target_include_directories(parson INTERFACE "${CMAKE_CURRENT_LIST_DIR}/parson")
+add_library(parson OBJECT parson/parson.c parson/parson.h)
+target_include_directories(parson SYSTEM PUBLIC
+    $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/parson>
+    $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
+)
 
-add_library(qgrayraster STATIC qgrayraster/qgrayraster.c
+add_library(qgrayraster OBJECT qgrayraster/qgrayraster.c
                                qgrayraster/qgrayraster_inc.h
                                qgrayraster/qgrayraster_p.h
                                qgrayraster/qrasterdefs_p.h)
-set_dp_target_properties(qgrayraster NO_CLANG_TIDY NO_WARNINGS)
-target_include_directories(qgrayraster INTERFACE
-                           "${CMAKE_CURRENT_LIST_DIR}/qgrayraster")
+target_include_directories(qgrayraster SYSTEM PUBLIC
+    $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/qgrayraster>
+    $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
+)
 
-add_library(mypaint STATIC libmypaint/brushsettings-gen.h
+add_library(mypaint OBJECT libmypaint/brushsettings-gen.h
             libmypaint/config.h libmypaint/fastapprox/cast.h
             libmypaint/fastapprox/fasterf.h libmypaint/fastapprox/fastexp.h
             libmypaint/fastapprox/fastgamma.h
@@ -104,15 +97,32 @@ add_library(mypaint STATIC libmypaint/brushsettings-gen.h
             libmypaint/mypaint-rectangle.h libmypaint/mypaint-surface.c
             libmypaint/mypaint-surface.h libmypaint/rng-double.c
             libmypaint/rng-double.h )
-set_dp_target_properties(mypaint NO_CLANG_TIDY NO_WARNINGS)
-target_include_directories(mypaint INTERFACE
-                           "${CMAKE_CURRENT_LIST_DIR}/libmypaint")
+target_include_directories(mypaint SYSTEM PUBLIC
+    $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/libmypaint>
+    $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
+)
 
 add_library(uthash INTERFACE)
-set_dp_target_properties(uthash NO_CLANG_TIDY NO_WARNINGS)
-target_include_directories(uthash INTERFACE "${CMAKE_CURRENT_LIST_DIR}/uthash")
+target_include_directories(uthash INTERFACE "uthash")
 
-add_library(jo_gifx STATIC jo_gifx/jo_gifx.h jo_gifx/jo_gifx.c)
-set_dp_target_properties(jo_gifx NO_WARNINGS)
-target_include_directories(
-    jo_gifx INTERFACE "${CMAKE_CURRENT_LIST_DIR}/jo_gifx")
+add_library(jo_gifx OBJECT jo_gifx/jo_gifx.h jo_gifx/jo_gifx.c)
+target_include_directories(jo_gifx SYSTEM PUBLIC
+    $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/jo_gifx>
+    $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
+)
+
+# The project root adds compiler warnings and tidy to all targets, but
+# third-party code does not follow the same code hygiene rules, so turn those
+# off for everything in this directory
+get_directory_property(third_party_targets BUILDSYSTEM_TARGETS)
+set_property(TARGET ${third_party_targets} APPEND PROPERTY
+    COMPILE_OPTIONS "${IGNORE_WARNINGS_COMPILE_OPTIONS}"
+)
+# It is not possible to use the same approach that was used to disable
+# warnings because CMake apparently discards empty list items when a list is
+# passed to set_target_properties, so instead we must loop to unset each
+# property
+foreach(ignore_tidy IN LISTS IGNORE_TIDY_PROPERTY_NAMES)
+    set_property(TARGET ${third_party_targets} PROPERTY ${ignore_tidy})
+endforeach()
+unset(third_party_targets)

3rdparty/dpgles2/gl2.h

@@ -58,7 +58,7 @@ extern "C" {
 
 #ifndef GL_ES_VERSION_2_0
 #define GL_ES_VERSION_2_0 1
-#include "../KHR/khrplatform.h"
+#include "khrplatform.h"
 typedef khronos_int8_t GLbyte;
 typedef khronos_float_t GLclampf;
 typedef khronos_int32_t GLfixed;

3rdparty/dpgles2/gl2platform.h

@@ -25,7 +25,7 @@
  *      https://github.com/KhronosGroup/OpenGL-Registry
  */
 
-#include "../KHR/khrplatform.h"
+#include "khrplatform.h"
 
 #ifndef GL_APICALL
 #define GL_APICALL  KHRONOS_APICALL