Raise CMake requirement to 3.10

It's difficult to support both old and new versions, so raise the
requirement to the oldest that is commonly used, which is CMake 3.10.2
on Ubuntu 18.04.

.github/containers/centos7/build.sh

@@ -33,6 +33,7 @@ sed -i "s/@VERSION@/${VERSION}/" ${CURDIR}/rpmbuild/SPECS/tigervnc.spec
 
 docker run --volume ${CURDIR}/rpmbuild:/home/rpm/rpmbuild --interactive --rm tigervnc/${DOCKER} \
 	bash -c "
+	sudo yum install -y epel-release &&
 	sudo yum-builddep -y ~/rpmbuild/SPECS/tigervnc.spec &&
         sudo chown 0.0 ~/rpmbuild/SOURCES/* &&
         sudo chown 0.0 ~/rpmbuild/SPECS/* &&

CMakeLists.txt

@@ -2,13 +2,7 @@
 # Setup
 #
 
-cmake_minimum_required(VERSION 2.8.11)
-if(POLICY CMP0022)
-  cmake_policy(SET CMP0022 OLD)
-endif()
-if(${CMAKE_VERSION} VERSION_LESS "3.4.0")
-  message(WARNING "CMake 3.4.0 or newer is required to get correct default installation paths")
-endif()
+cmake_minimum_required(VERSION 3.10.0)
 
 # Internal cmake modules
 set(CMAKE_MODULE_PATH ${CMAKE_SOURCE_DIR}/cmake/Modules)
@@ -117,20 +111,6 @@ else()
   message(STATUS "32-bit build")
 endif()
 
-# Versions of CMake before 2.8.7 do not properly support resource compilation
-# with MinGW.  Boo!
-if(MINGW AND "${CMAKE_VERSION}" VERSION_LESS "2.8.7")
-  if(NOT DEFINED RC)
-    set(CMAKE_RC_COMPILER_INIT windres)
-  else()
-    set(CMAKE_RC_COMPILER_INIT ${RC})
-  endif()
-  enable_language(RC)
-  message(STATUS "Resource compiler: ${CMAKE_RC_COMPILER}")
-  set(CMAKE_RC_COMPILE_OBJECT
-    "<CMAKE_RC_COMPILER> <FLAGS> <DEFINES> -o <OBJECT> --output-format=coff <SOURCE>")
-endif()
-
 # MinGW64 has header support but no library support for IActiveDesktop, so we
 # need to check for both the header and library and use our own implementation
 # in common/os if either doesn't exist.

contrib/packages/rpm/el7/SPECS/tigervnc.spec

@@ -26,7 +26,7 @@ BuildRequires:  mesa-libGL-devel, libXinerama-devel, ImageMagick
 BuildRequires:  freetype-devel, libXdmcp-devel, libXfont2-devel
 BuildRequires:  libXrandr-devel, fltk-devel >= 1.3.3
 BuildRequires:  libjpeg-turbo-devel, gnutls-devel, pam-devel
-BuildRequires:  systemd, cmake, selinux-policy-devel
+BuildRequires:  systemd, cmake3, selinux-policy-devel
 BuildRequires:  libpng-devel
 BuildRequires:  zlib-devel
 
@@ -160,11 +160,7 @@ export CPPFLAGS="$CXXFLAGS"
 
 export CMAKE_EXE_LINKER_FLAGS=$LDFLAGS
 
-# The cmake in RHEL is too old and doesn't set up
-# CMAKE_INSTALL_SYSCONFDIR properly
-%{cmake} -G"Unix Makefiles" \
-  -DCMAKE_INSTALL_SYSCONFDIR:PATH=%{_sysconfdir} \
-  -DBUILD_STATIC=off
+%{cmake3} -G"Unix Makefiles" -DBUILD_STATIC=off
 make %{?_smp_mflags}
 
 pushd unix/xserver

contrib/packages/rpm/el8/SPECS/tigervnc.spec

@@ -161,11 +161,7 @@ export CPPFLAGS="$CXXFLAGS"
 
 export CMAKE_EXE_LINKER_FLAGS=$LDFLAGS
 
-# The cmake in RHEL is too old and doesn't set up
-# CMAKE_INSTALL_SYSCONFDIR properly
-%{cmake} -G"Unix Makefiles" \
-  -DCMAKE_INSTALL_SYSCONFDIR:PATH=%{_sysconfdir} \
-  -DBUILD_STATIC=off
+%{cmake} -G"Unix Makefiles" -DBUILD_STATIC=off
 make %{?_smp_mflags}
 
 pushd unix/xserver

java/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.8.11)
+cmake_minimum_required(VERSION 3.10.0)
 
 project(tigervnc-java Java)
 if(NOT VERSION)