Stephen Kelly 7a619fa6fb Fix cmGeneratorExpression::Preprocess for interleaved inputs. ...

We can't find both preprocessing expressions at once, because then
the BUILD_INTERFACE will always be favored if both are present, even
if INSTALL_INTERFACE appears first.

This was affecting the behavior of install(EXPORT) because the
INTERFACE_INCLUDE_DIRECTORIES contained entries like

 /foo/include;$<INSTALL_INTERFACE:/bar/include>

As the INSTALL_INTERFACE always evaluates to '0', it always needs
to be preprocessed properly.

2013-03-18 15:09:47 +01:00

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