QTC generated compilation database does not include project-wide compiler flags

QTC does not pick up project-wide compiler flags, added with `add_compile_options`:

hugo@YellowBox MSYS /c/Users/hugo/Documents/QtProject
$ cat CMakeLists.txt
cmake_minimum_required(VERSION 3.16)

project(testProj VERSION 1.0.0 LANGUAGES C CXX)

message(STATUS ${CMAKE_C_COMPILER_ID})

set(CMAKE_CXX_STANDARD 20)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

find_package(Qt6 REQUIRED COMPONENTS Core)
find_library(LIB_advapi32 advapi32 REQUIRED)
qt_standard_project_setup()

qt_add_executable(testProj main.cpp)
target_link_libraries(testProj PRIVATE Qt6::Core)
add_compile_options(-DFOO)

hugo@YellowBox MSYS /c/Users/hugo/Documents/QtProject
$ cat CMakeLists.txt
cmake_minimum_required(VERSION 3.16)

project(testProj VERSION 1.0.0 LANGUAGES C CXX)

message(STATUS ${CMAKE_C_COMPILER_ID})

set(CMAKE_CXX_STANDARD 20)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

find_package(Qt6 REQUIRED COMPONENTS Core)
find_library(LIB_advapi32 advapi32 REQUIRED)
qt_standard_project_setup()

qt_add_executable(testProj main.cpp)
target_link_libraries(testProj PRIVATE Qt6::Core)
target_compile_options(testProj PRIVATE -DFOO)