We must not set QMAKE_INCDIR_VULKAN if the Vulkan SDK is installed in
some default include directory. MinGW's std headers rely on
#include_next, which will break if we mess with the order of default
include paths.
Fixes: QTBUG-76660
Change-Id: I5ee0fc4c328ff88b979a8c1c010472b3883dff8d
Reviewed-by: Kai Koehne <kai.koehne@qt.io>
Like in Qt code itself we should use forward slashes consistently.
This enables the vulkan test to run on Linux for MinGW
cross-compilation.
Task-number: QTBUG-76660
Change-Id: Ifc6dec11bac3c3769d5d06e49da529f66f7b5843
Reviewed-by: Kai Koehne <kai.koehne@qt.io>
Do not store this variable locally, because
a) it might change if the SDK location changes
b) does not play well with Qt installer packages which would provide the
include path of the build machine.
To achieve this we introduce the (usual) magic value - for
QMAKE_EXPORT_INCDIR_VULKAN to denote "do not export this value".
Fixes: QTBUG-73796
Change-Id: Ied26ee12cbcdf7f5f6e1caef5d29dadf6309c5d6
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
Reviewed-by: Kai Koehne <kai.koehne@qt.io>
