Merge branch 'InstallRequiredSystemLibraries-vs12-mfc' into release
KWSys SystemInformation: Include backtrace APIs whenever we use them

Include execinfo.h, cxxabi.h, and dlfcn.h under the same conditions
under which we use the APIs from them.  Move their inclusion out of
OS-specific blocks.
Merge branch 'backport-kwsys-compile-fix' into release
Merge branch 'hpux-compile' into release
cmTarget: Don't assert on object libraries for configure-time location.

Commit b8af2011 (cmTarget: Fix listing of source files at
configure-time., 2014-04-13) refactored a GetObjectLibrariesCMP0026
method out of GetLanguages.  In flight, a conditional use of a target
if available was changed to an assert-available.

This code is only used to read the LOCATION property at configure
time, when the link information is incomplete, and not all targets
are defined, so the assert is inappropriate, even though it can lead
to incorrect information being generated.  CMP0026 warns about the
potentially incorrect information anyway.
Project: Clarify comment about platform-native compilers.
Merge topic 'backport-kwsys-compile-fix'

8c5b9cf9 KWSys SystemInformation: Include backtrace APIs whenever we use them
Merge branch 'release'
Merge topic 'no-assert-missing-objlib'

d648c476 cmTarget: Don't assert on object libraries for configure-time location.
Merge topic 'compiler-id-comment'

c7ddd409 Project: Clarify comment about platform-native compilers.