[Qbs] isystem with clang

[Christian Gagneraud]

Hi there,

Couldn't find any definite answer about using '-isystem' to avoid the
compiler to report warning as error in 3rd party headers (qt, gtest,
...).
Looking at the cpp module, i can see some logic, but I can't seem to
find a way to force the use of isystem.
The only suggestion I found was to hack Qt's modules to change
cpp.includePath to  cpp.systemIncludePath.

Is this still the case, or am i missing something?

Chris