qtbase 6.6.0-beta2 fails to build (linux-clang target) at cmake stage if -DQT_FEATURE_gc_binaries is used

CMake Error at cmake/QtPkgConfigHelpers.cmake:104 (file): 
 Error evaluating generator expression: 

   $<CXX_COMPILER_ID:IntelLLVM$<ANGLE-R>$<ANGLE-R>:-Wl$<COMMA>--gc-sections$<ANGLE-R>> 

 $<CXX_COMPILER_ID> may only be used with binary targets.  It may not be 
 used with add_custom_command or add_custom_target. 
Call Stack (most recent call first): 
 cmake/QtModuleHelpers.cmake:915 (qt_internal_generate_pkg_config_file) 
 cmake/QtScopeFinalizerHelpers.cmake:24:EVAL:1 (qt_finalize_module) 
 src/corelib/CMakeLists.txt:DEFERRED 


CMake Error at cmake/QtPkgConfigHelpers.cmake:104 (file): 
 Error evaluating generator expression: 

   $<CXX_COMPILER_ID:IntelLLVM$<ANGLE-R>$<ANGLE-R>:-Wl$<COMMA>--gc-sections$<ANGLE-R>> 

 $<CXX_COMPILER_ID> may only be used with binary targets.  It may not be 
 used with add_custom_command or add_custom_target. 
Call Stack (most recent call first): 
 cmake/QtModuleHelpers.cmake:915 (qt_internal_generate_pkg_config_file) 
 cmake/QtScopeFinalizerHelpers.cmake:24:EVAL:1 (qt_finalize_module) 
 src/corelib/CMakeLists.txt:DEFERRED 


CMake Error at cmake/QtPkgConfigHelpers.cmake:104 (file): 
 Error evaluating generator expression: 

   $<CXX_COMPILER_ID:IntelLLVM$<ANGLE-R>$<ANGLE-R>:-Wl$<COMMA>--gc-sections$<ANGLE-R>> 

 $<CXX_COMPILER_ID> may only be used with binary targets.  It may not be 
 used with add_custom_command or add_custom_target. 
Call Stack (most recent call first): 
 cmake/QtModuleHelpers.cmake:915 (qt_internal_generate_pkg_config_file) 
 cmake/QtScopeFinalizerHelpers.cmake:24:EVAL:1 (qt_finalize_module) 
 src/corelib/CMakeLists.txt:DEFERRED

9b6d4f542f32a786c0ddb4ca8ecb1f2c8fb668c1 is the first bad commit
commit 9b6d4f542f32a786c0ddb4ca8ecb1f2c8fb668c1
Author: Alexey Edelev <alexey.edelev@qt.io>
Date: Fri May 12 17:21:22 2023 +0200

Wrap the GNU/Clang compiler-dependent flags with genex conditions

If flags use CMake scopes that propagate them to user libraries, it may
lead to an issue, if user projects are built using different compiler.
We need to guard these flags to make sure that they only will apply to
respective compilers.

Change-Id: I0fd5847447bd8373e8e07f64dae11f27f48c915d
Reviewed-by: Alexandru Croitor (OOO) <alexandru.croitor@qt.io>
Reviewed-by: Amir Masoud Abdol <amir.abdol@qt.io>
(cherry picked from commit a2b6c2f3437bf1779da787e719bea08bc6f28622)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

cmake/QtFlagHandlingHelpers.cmake | 24 +++++++++++++++++++++---
1 file changed, 21 insertions(+), 3 deletions(-)