From e18467d755f470b26f61f6893eddd76ecf0816e6 Mon Sep 17 00:00:00 2001
From: Rinigus <rinigus.git@gmail.com>
Date: Sun, 22 Nov 2020 18:47:41 +0200
Subject: [PATCH] [build][qt] Add support for qmapboxgl installation

Adds install target for Qt version of the library. Allows to
select which parts of Qt platform are built
---
 platform/qt/qt.cmake | 58 +++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 54 insertions(+), 4 deletions(-)

diff --git a/platform/qt/qt.cmake b/platform/qt/qt.cmake
index 8184d5079c5..858833a85a5 100644
--- a/platform/qt/qt.cmake
+++ b/platform/qt/qt.cmake
@@ -1,9 +1,16 @@
 # Note: Using Sqlite instead of QSqlDatabase for better compatibility.
 
+option(MBGL_WITH_QT_LIB_ONLY "Build only qmapboxgl library" OFF)
+option(MBGL_WITH_QT_HEADLESS "Build Mapbox GL Qt with headless support" ON)
+
+include(GNUInstallDirs)
 find_package(Qt5Gui REQUIRED)
 find_package(Qt5Network REQUIRED)
-find_package(Qt5OpenGL REQUIRED)
-find_package(Qt5Widgets REQUIRED)
+
+if(MBGL_WITH_QT_HEADLESS OR NOT MBGL_WITH_QT_LIB_ONLY)
+    find_package(Qt5OpenGL REQUIRED)
+    find_package(Qt5Widgets REQUIRED)
+endif()
 
 if(CMAKE_SYSTEM_NAME STREQUAL "Windows")
     add_definitions("-DQT_COMPILING_QIMAGE_COMPAT_CPP")
@@ -50,7 +57,6 @@ target_sources(
         ${PROJECT_SOURCE_DIR}/platform/qt/src/async_task_impl.hpp
         ${PROJECT_SOURCE_DIR}/platform/qt/src/number_format.cpp
         ${PROJECT_SOURCE_DIR}/platform/qt/src/gl_functions.cpp
-        ${PROJECT_SOURCE_DIR}/platform/qt/src/headless_backend_qt.cpp
         $<$<BOOL:${MBGL_PUBLIC_BUILD}>:${PROJECT_SOURCE_DIR}/platform/qt/src/http_file_source.cpp>
         $<$<BOOL:${MBGL_PUBLIC_BUILD}>:${PROJECT_SOURCE_DIR}/platform/qt/src/http_file_source.hpp>
         $<$<BOOL:${MBGL_PUBLIC_BUILD}>:${PROJECT_SOURCE_DIR}/platform/qt/src/http_request.cpp>
@@ -68,6 +74,15 @@ target_sources(
         ${PROJECT_SOURCE_DIR}/platform/qt/src/utf.cpp
 )
 
+if(MBGL_WITH_QT_HEADLESS OR NOT MBGL_WITH_QT_LIB_ONLY)
+    target_sources(
+        mbgl-core
+        PRIVATE
+            ${PROJECT_SOURCE_DIR}/platform/qt/src/headless_backend_qt.cpp
+    )
+endif()
+
+
 target_compile_definitions(
     mbgl-core
     PRIVATE QT_IMAGE_DECODERS
@@ -91,11 +106,18 @@ target_link_libraries(
         Qt5::Core
         Qt5::Gui
         Qt5::Network
-        Qt5::OpenGL
         mbgl-vendor-nunicode
         mbgl-vendor-sqlite
 )
 
+if(MBGL_WITH_QT_HEADLESS)
+    target_link_libraries(
+        mbgl-core
+        PRIVATE
+            Qt5::OpenGL
+    )
+endif()
+
 add_library(
     qmapboxgl SHARED
     ${PROJECT_SOURCE_DIR}/platform/qt/include/qmapbox.hpp
@@ -141,6 +163,34 @@ target_link_libraries(
         mbgl-core
 )
 
+# install library and headers
+install(
+    DIRECTORY include/mbgl
+    DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}"
+    COMPONENT development
+)
+
+install(
+    TARGETS qmapboxgl
+    LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}" COMPONENT shared NAMELINK_SKIP
+    ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}" COMPONENT development
+)
+
+install(
+    FILES
+        platform/qt/include/QMapbox
+        platform/qt/include/QMapboxGL
+        platform/qt/include/qmapbox.hpp
+        platform/qt/include/qmapboxgl.hpp
+    DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/qt5"
+    COMPONENT development
+)
+
+# stop here if only library is requested
+if(MBGL_WITH_QT_LIB_ONLY)
+    return()
+endif()
+
 add_executable(
     mbgl-qt
     ${PROJECT_SOURCE_DIR}/platform/qt/app/main.cpp