PrintHelpers: Fix target SOURCES property

It's been a long-standing bug in CMakePrintHelpers that the
cmake_print_properties() function cannot print the SOURCES
property of a requested TARGET, confusing it with a request
to print properties of SOURCES.

We work around this by parsing the arguments in two stages,
so that a SOURCES that comes after the PROPERTIES keyword
is handled differently from a SOURCES that comes before it.

This adds the restriction that the "mode" keyword (TARGETS
SOURCES DIRECTORIES etc...) and its arguments **must** precede
the PROPERTIES keyword and its arguments. In other words:

1. Both of these are now valid and will be interpreted correctly,
   whereas previously only the first was, and the second caused
   a FATAL_ERROR:

   cmake_print_properties(SOURCES foo.c PROPERTIES LANGUAGE)
   cmake_print_properties(TARGETS foo PROPERTIES SOURCES)

2. This, OTOH, which used to be valid, no longer is, and will
   trigger a FATAL_ERROR:

   cmake_print_properties(PROPERTIES LANGUAGE SOURCES foo.c)

Fixes: #14883

0 files changed, 0 insertions, 0 deletions