From 19a962fc0d69bd31e97939dcca839cd4970b7d9f Mon Sep 17 00:00:00 2001
From: Gideon <g.mueller@fz-juelich.de>
Date: Tue, 22 Dec 2020 17:33:25 +0100
Subject: [PATCH] GH-actions and CMake: fix ImGui builds. Also deactivated
 ImGui build for coverage builds etc.

---
 .github/workflows/ci.yml | 18 ++++++++++++------
 ui-cpp/CMakeLists.txt    | 15 +++++++++++++++
 2 files changed, 27 insertions(+), 6 deletions(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f3be66c33..c6316408d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -27,13 +27,19 @@ jobs:
             build-type: Release
     env:
       BUILD_TYPE: ${{ matrix.build-type }}
-      CMAKE_FLAGS: -DSPIRIT_UI_CXX_USE_QT=OFF
+      CMAKE_FLAGS: -DSPIRIT_UI_USE_IMGUI=ON -DSPIRIT_UI_CXX_USE_QT=OFF
       OMP_NUM_THREADS: 4
       EXCLUDETESTS: ${{ matrix.excludetests }}
 
     steps:
     - uses: actions/checkout@v2
 
+    - name: Install required system packages
+      if: matrix.os == 'ubuntu-latest'
+      run: |
+        sudo apt update
+        sudo apt install xorg-dev libglu1-mesa-dev libgtk-3-dev
+
     - name: Create build folder
       run: cmake -E make_directory ${{runner.workspace}}/build
 
@@ -66,7 +72,7 @@ jobs:
     runs-on: ubuntu-latest
     env:
       BUILD_TYPE: Release
-      CMAKE_FLAGS: -DSPIRIT_UI_CXX_USE_QT=OFF -DSPIRIT_TEST_COVERAGE=ON
+      CMAKE_FLAGS: -DSPIRIT_UI_USE_IMGUI=OFF -DSPIRIT_UI_CXX_USE_QT=OFF -DSPIRIT_TEST_COVERAGE=ON
 
     steps:
     - uses: actions/checkout@v2
@@ -119,7 +125,7 @@ jobs:
     runs-on: ubuntu-latest
     env:
       BUILD_TYPE: Release
-      CMAKE_FLAGS: -DSPIRIT_UI_CXX_USE_QT=OFF -DSPIRIT_ENABLE_PINNING=ON -DSPIRIT_ENABLE_DEFECTS=ON
+      CMAKE_FLAGS: -DSPIRIT_UI_USE_IMGUI=OFF -DSPIRIT_UI_CXX_USE_QT=OFF -DSPIRIT_ENABLE_PINNING=ON -DSPIRIT_ENABLE_DEFECTS=ON
 
     steps:
     - uses: actions/checkout@v2
@@ -155,7 +161,7 @@ jobs:
           - os: ubuntu-18.04
     env:
       BUILD_TYPE: Release
-      CMAKE_FLAGS: -DSPIRIT_UI_CXX_USE_QT=OFF -DSPIRIT_USE_CUDA=ON -DSPIRIT_CUDA_ARCH=sm_70
+      CMAKE_FLAGS: -DSPIRIT_UI_USE_IMGUI=OFF -DSPIRIT_UI_CXX_USE_QT=OFF -DSPIRIT_USE_CUDA=ON -DSPIRIT_CUDA_ARCH=sm_70
 
     steps:
     - uses: actions/checkout@v2
@@ -180,7 +186,7 @@ jobs:
     runs-on: ubuntu-18.04
     env:
       BUILD_TYPE: Release
-      CMAKE_FLAGS: -DSPIRIT_UI_CXX_USE_QT=ON
+      CMAKE_FLAGS: -DSPIRIT_UI_USE_IMGUI=OFF -DSPIRIT_UI_CXX_USE_QT=ON
 
     steps:
     - uses: actions/checkout@v2
@@ -247,7 +253,7 @@ jobs:
         os: [ubuntu-latest, macos-latest, windows-latest]
     env:
       BUILD_TYPE: Release
-      CMAKE_FLAGS: -DSPIRIT_UI_CXX_USE_QT=OFF
+      CMAKE_FLAGS: -DSPIRIT_UI_USE_IMGUI=OFF -DSPIRIT_UI_CXX_USE_QT=OFF
       SPIRIT_ADD_VERSION_SUFFIX: true
 
     steps:
diff --git a/ui-cpp/CMakeLists.txt b/ui-cpp/CMakeLists.txt
index 83a407dd6..4261a97d0 100644
--- a/ui-cpp/CMakeLists.txt
+++ b/ui-cpp/CMakeLists.txt
@@ -182,6 +182,21 @@ if( SPIRIT_UI_USE_IMGUI )
         target_sources( nativefiledialog PRIVATE ${NFD_SRC_DIR}/nfd_emscripten.cpp )
     elseif( UNIX )
         target_sources( nativefiledialog PRIVATE ${NFD_SRC_DIR}/nfd_gtk.c )
+
+        # Use the package PkgConfig to detect GTK+ headers/library files
+        FIND_PACKAGE( PkgConfig REQUIRED )
+        PKG_CHECK_MODULES( GTK REQUIRED gtk+-3.0 )
+
+        # Setup CMake to use GTK+, tell the compiler where to look for headers
+        # and the linker where to look for libraries
+        target_include_directories( nativefiledialog PUBLIC ${GTK_INCLUDE_DIRS} )
+        target_link_directories( nativefiledialog PUBLIC ${GTK_LIBRARY_DIRS} )
+
+        # Add other flags to the compiler
+        add_definitions( ${GTK_CFLAGS_OTHER} )
+
+        # Link the target to the GTK+ libraries
+        target_link_libraries( nativefiledialog ${GTK_LIBRARIES} )
     endif()
 endif()
 ####################################################################