We want syncqt to be built optimized by default. The current approach
set the default build type for the external projects and optimized
flags for the non-configure-time syncqt build. The problem is that
syncqt still have compiler flags littered by either the Qt configuration
type or the system defaults that are applicable for RelWithDebugInfo
configuration(the default one we chose for syncqt).
This patch makes sure that we cleanup all compiler flags from any
optimizations and apply optimized flags for all configurations. Also
we discard '/RTC1' flag if it's set. Configure time executables now
respect the language related flags that are set in the project and
adjust the flags passed to try_compile.
For linker flags we should use those that are applicable for the
preferred build type. Since syncqt is built in RelWithDebugInfo
by default we should replace linker flags in all configs with
those are used for RelWithDebugInfo configuration.
Fixes: QTBUG-114925
Pick-to: 6.5 6.6
Change-Id: I782f81a36f5ef7ee4d342ce8ac6c217cb2552f3b
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
49ce711796