cmake/ECM/modules - sync to upstream

Author: Allen Winter

cmake/ECM/modules/ECMGenerateHeaders.cmake

@@ -118,8 +118,6 @@ Example usage (with ``PREFIX``):
 Since pre-1.0.0.
 #]=======================================================================]
 
-include(CMakeParseArguments)
-
 function(ECM_GENERATE_HEADERS camelcase_forwarding_headers_var)
     set(options)
     set(oneValueArgs ORIGINAL HEADER_EXTENSION OUTPUT_DIR PREFIX REQUIRED_HEADERS COMMON_HEADER RELATIVE)

cmake/ECM/modules/ECMSetupVersion.cmake

@@ -142,7 +142,7 @@ function(ecm_setup_version _version)
         string(REGEX REPLACE "^[0-9]+\\.[0-9]+\\.0*([0-9]+).*" "\\1" _patch "${_version}")
     endif()
 
-    if(NOT ESV_SOVERSION)
+    if(NOT DEFINED ESV_SOVERSION) # use DEFINED, so "0" as valid SO version is not evaluated to FALSE
         set(ESV_SOVERSION ${_major})
     endif()
 

cmake/ECM/modules/QtVersionOption.cmake

@@ -12,6 +12,9 @@ that is, if the major Qt version has not yet been determined otherwise
 This module is typically included by other modules requiring knowledge
 about the major Qt version.
 
+If the ECM version passed to find_package was at least 5.240.0 Qt6 is picked by default.
+Otherwise Qt5 is picked.
+
 ``QT_MAJOR_VERSION`` is defined to either be "5" or "6".
 
 Since 5.82.0.
@@ -26,7 +29,11 @@ if (TARGET Qt5::Core)
 elseif (TARGET Qt6::Core)
     set(QT_MAJOR_VERSION 6)
 else()
-    option(BUILD_WITH_QT6 "Build against Qt 6" OFF)
+    if (ECM_GLOBAL_FIND_VERSION VERSION_GREATER_EQUAL 5.240)
+        option(BUILD_WITH_QT6 "Build against Qt 6" ON)
+    else()
+        option(BUILD_WITH_QT6 "Build against Qt 6" OFF)
+    endif()
 
     if (BUILD_WITH_QT6)
         set(QT_MAJOR_VERSION 6)