Qt4: write moc parameter file only when content has changed
Features: Make CMAKE_CXX_KNOWN_FEATURES a property.

As a 'built-in' variable it imposes a cost on all variable lookups
and it is expected to be rarely used.
CompileFlags: Test for C++ features after selecting flags

Some flags we select may affect availability of C++ features.
CompileFlags: Add -AA +hpxstd98 on HP-UX 11.11 with aCC

These flags are needed to enable support for C++98.  Also teach the
'bootstrap' script to add them if necessary.
CompileFlags: add better selection which aCC version gets -AA +hpxstd98 flags
Qt4: Extend the Qt4Targets test to cover dir and target moc parameters.
Merge topic 'hpux-compile'

500d83ba CompileFlags: add better selection which aCC version gets -AA +hpxstd98 flags
f347fd12 CompileFlags: Add -AA +hpxstd98 on HP-UX 11.11 with aCC
4ca9b008 CompileFlags: Test for C++ features after selecting flags
Merge topic 'dont-rewrite-moc-parameter-file'

17c31b8b Qt4: Extend the Qt4Targets test to cover dir and target moc parameters.
6a5bd7f0 Qt4: write moc parameter file only when content has changed
Merge topic 'CMAKE_CXX_KNOWN_FEATURES-global-property'

3fdfa5d3 Features: Make CMAKE_CXX_KNOWN_FEATURES a property.