From: Matthew Fernandez <matthew.fernandez@gmail.com>
Date: Sat, 31 Dec 2022 00:23:31 +0000 (-0800)
Subject: CMake: look for and use Qt6 in preference to Qt5
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=743aed2fea0206827294c9efa6ab117a2ba8dceb;p=graphviz

CMake: look for and use Qt6 in preference to Qt5

Gitlab: #2233
---

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7e288817b..85eae01f4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - The Autotools build system no longer looks for `python` binaries. The Python
   interpreter is unconditionally assumed to be `python3`. The configure option
   `--enable-python` is now an alias for `--enable-python3`.
+- The CMake build system, when building `gvedit`, will now look for and use Qt6
+  in preference over Qt5. #2233
 
 ### Fixed
 
diff --git a/cmd/gvedit/CMakeLists.txt b/cmd/gvedit/CMakeLists.txt
index e71230405..5fdcd76e8 100644
--- a/cmd/gvedit/CMakeLists.txt
+++ b/cmd/gvedit/CMakeLists.txt
@@ -1,5 +1,11 @@
 if(with_gvedit)
-  find_package(Qt5 COMPONENTS Core PrintSupport Widgets REQUIRED)
+  find_package(Qt6 COMPONENTS Core PrintSupport Widgets)
+  if(Qt6_FOUND)
+    set(QT_LIBS Qt6::Core Qt6::PrintSupport Qt6::Widgets)
+  else()
+    find_package(Qt5 COMPONENTS Core PrintSupport Widgets REQUIRED)
+    set(QT_LIBS Qt5::Core Qt5::PrintSupport Qt5::Widgets)
+  endif()
 
   add_executable(gvedit
     csettings.cpp
@@ -34,7 +40,7 @@ if(with_gvedit)
     gvc
   )
 
-  target_link_libraries(gvedit PRIVATE Qt5::Core Qt5::PrintSupport Qt5::Widgets)
+  target_link_libraries(gvedit PRIVATE ${QT_LIBS})
 
   if(EXPAT_FOUND)
     target_include_directories(gvedit SYSTEM PRIVATE ${EXPAT_INCLUDE_DIRS})