Generally these are only required in build statements, as Ninja wants
to be able to chop paths up. But it doesn't hurt to also try to use
them in command line arguments.
Consider the case motivating commit e01cce28 (Allow add_dependencies()
on imported targets, 2010-11-19). An imported target references a file
generated at build time by a custom target on which it depends. Had the
file been built directly using add_library or add_executable its target
name would have been visible globally. Therefore the imported target
representing the file should be globally visible also.
Teach the IMPORTED signature of add_(executable|library) to accept a new
"GLOBAL" option to make the imported target visible globally.
0df1942 Detect SGI MIPSpro compiler version with its id
a5e892c Document compiler version macro formats used for detection
d7c6f41 Detect HP compiler version with its id
3dd9fa9 Detect SunPro compiler version with its id
c198730 Detect Watcom compiler version with its id
5899b98 Detect Clang compiler version with its id
b8cfa65 Detect PGI compiler version with its id
6dae666 Detect IBM XL compiler version with its id
4080d55 Detect Borland compiler version with its id
2cc205a Detect Intel compiler version with its id (#11937)
a6d83cc Detect MSVC compiler version with its id
a662855 Detect GNU compiler version with its id (#6251)
fa7141f Add framework to detect compiler version with its id (#12408)
Since commit 183b9509 (Follow all dependencies of shared library private
dependencies, 2011-12-14) we honor LINK_INTERFACE_LIBRARIES when
following dependent shared libraries. The link interface properties may
form a cycle if set incorrectly by a project. Furthermore, the property
LINK_DEPENDENT_LIBRARIES may form a cycle if set incorrectly by hand
(though CMake should never generate one). In either case, do not follow
the cycle forever when following the dependent shared library closure.
We only need to add dependency edges to the constraint graph once.
Add "LinkInterfaceLoop" test to cover this case.