From e7ab88e3684b4a56a4c3854945371739cb5d9b5f Mon Sep 17 00:00:00 2001
From: Uwe Hermann <uwe@hermann-uwe.de>
Date: Tue, 28 Mar 2017 22:26:02 +0200
Subject: [PATCH] Drop support for Qt4.

We now require Qt5 for PulseView. Qt5 has been out since 2012 or so and
is available pretty much everywhere now.

We're successfully using Qt5 on Linux, Windows, *BSD, Mac OS X, and Android.

Dropping Qt4 support simplifies the build system quite a bit, reduces the
number of test scenarios we have to consider etc. etc.
---
 CMakeLists.txt      | 42 +++++++++++-------------------------------
 INSTALL             |  5 ++---
 test/CMakeLists.txt | 10 +---------
 3 files changed, 14 insertions(+), 43 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index d2697fae..0d9b455f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -35,7 +35,6 @@ option(ENABLE_SIGNALS "Build with UNIX signals" TRUE)
 option(ENABLE_DECODE "Build with libsigrokdecode" TRUE)
 option(ENABLE_TESTS "Enable unit tests" TRUE)
 option(STATIC_PKGDEPS_LIBS "Statically link to (pkg-config) libraries" FALSE)
-option(FORCE_QT4 "Force use of Qt4 even if Qt5 is available" FALSE)
 
 if(WIN32)
 	# On Windows/MinGW we need to statically link to libraries.
@@ -69,30 +68,21 @@ endif()
 find_package(PkgConfig)
 pkg_check_modules(PKGDEPS REQUIRED ${PKGDEPS})
 
-if(FORCE_QT4)
-	set(Qt5Core_FOUND FALSE)
-else()
-	find_package(Qt5Core QUIET)
+find_package(Qt5Core REQUIRED)
+find_package(Qt5Widgets REQUIRED)
+find_package(Qt5Gui REQUIRED)
+find_package(Qt5Svg REQUIRED)
+
 if(WIN32)
 	# MXE workaround: Use pkg-config to find Qt5 libs.
 	# https://github.com/mxe/mxe/issues/1642
 	pkg_check_modules(QT5ALL REQUIRED Qt5Widgets Qt5Gui Qt5Svg)
 endif()
-endif()
 
-if(Qt5Core_FOUND)
-	message("-- Using Qt5")
-	find_package(Qt5Widgets REQUIRED)
-	find_package(Qt5Gui REQUIRED)
-	find_package(Qt5Svg REQUIRED)
-	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${Qt5Widgets_EXECUTABLE_COMPILE_FLAGS}")
-	set(QT_INCLUDE_DIRS ${Qt5Gui_INCLUDE_DIRS} ${Qt5Widgets_INCLUDE_DIRS})
-	set(QT_LIBRARIES Qt5::Gui Qt5::Widgets Qt5::Svg)
-	add_definitions(${Qt5Gui_DEFINITIONS} ${Qt5Widgets_DEFINITIONS})
-else()
-	find_program(QT_QMAKE_EXECUTABLE NAMES qmake4 qmake-qt4 qmake-mac)
-	find_package(Qt4 REQUIRED QtCore QtGui QtSvg)
-endif()
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${Qt5Widgets_EXECUTABLE_COMPILE_FLAGS}")
+set(QT_INCLUDE_DIRS ${Qt5Gui_INCLUDE_DIRS} ${Qt5Widgets_INCLUDE_DIRS})
+set(QT_LIBRARIES Qt5::Gui Qt5::Widgets Qt5::Svg)
+add_definitions(${Qt5Gui_DEFINITIONS} ${Qt5Widgets_DEFINITIONS})
 
 set(BOOSTCOMPS filesystem serialization system)
 if(ENABLE_TESTS)
@@ -104,7 +94,6 @@ find_package(Boost 1.55 COMPONENTS ${BOOSTCOMPS} REQUIRED)
 # This will set ${CMAKE_THREAD_LIBS_INIT} to the correct, OS-specific value.
 find_package(Threads REQUIRED)
 
-
 # Check for explicit link against libatomic
 #
 # Depending on the toolchain, linking a program using atomic functions may need
@@ -377,17 +366,8 @@ if(ANDROID)
 	)
 endif()
 
-if(Qt5Core_FOUND)
-	qt5_wrap_cpp(pulseview_HEADERS_MOC ${pulseview_HEADERS})
-	qt5_add_resources(pulseview_RESOURCES_RCC ${pulseview_RESOURCES})
-else()
-	# Workaround for QTBUG-22829: -DBOOST_NEXT_PRIOR_HPP_INCLUDED.
-	# https://bugreports.qt.io/browse/QTBUG-22829
-	qt4_wrap_cpp(pulseview_HEADERS_MOC ${pulseview_HEADERS}
-		OPTIONS -DBOOST_NEXT_PRIOR_HPP_INCLUDED)
-	qt4_add_resources(pulseview_RESOURCES_RCC ${pulseview_RESOURCES})
-	include(${QT_USE_FILE})
-endif()
+qt5_wrap_cpp(pulseview_HEADERS_MOC ${pulseview_HEADERS})
+qt5_add_resources(pulseview_RESOURCES_RCC ${pulseview_RESOURCES})
 
 #===============================================================================
 #= Global Definitions
diff --git a/INSTALL b/INSTALL
index e17cb252..075b18ce 100644
--- a/INSTALL
+++ b/INSTALL
@@ -15,9 +15,8 @@ Requirements
  - cmake >= 2.8.6
  - libglib >= 2.28.0
  - glibmm-2.4 (>= 2.28.0)
- - Qt4 >= 4.5 or Qt5 (including the following components):
-    - Qt4: QtCore, QtGui, QtSvg
-    - Qt5: Qt5Core, Qt5Gui, Qt5Widgets, Qt5Svg
+ - Qt5 (including the following components):
+    - Qt5Core, Qt5Gui, Qt5Widgets, Qt5Svg
  - libboost >= 1.55 (including the following libs):
     - libboost-system
     - libboost-filesystem
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 05b5cb4b..3a1a3d29 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -176,15 +176,7 @@ if(ENABLE_DECODE)
 	)
 endif()
 
-if(Qt5Core_FOUND)
-	qt5_wrap_cpp(pulseview_TEST_HEADERS_MOC ${pulseview_TEST_HEADERS})
-else()
-	# Workaround for QTBUG-22829: -DBOOST_NEXT_PRIOR_HPP_INCLUDED.
-	# https://bugreports.qt.io/browse/QTBUG-22829
-	qt4_wrap_cpp(pulseview_TEST_HEADERS_MOC ${pulseview_TEST_HEADERS}
-		OPTIONS -DBOOST_NEXT_PRIOR_HPP_INCLUDED)
-	include(${QT_USE_FILE})
-endif()
+qt5_wrap_cpp(pulseview_TEST_HEADERS_MOC ${pulseview_TEST_HEADERS})
 
 # On MinGW we need to use static linking.
 if(NOT WIN32)
-- 
2.30.2