This patch fixes the ivl build to find files in libmisc using vpath instead
of a separate target. The existing constructs caused build problems after
running a make clean. It also adds an empty checking target to vhdlpp.
Include the compiler infrastructure to vhdlpp for collecting the
file and line information and attaching it to entities and ports.
Make the parser store the file name during parse.
Create a libmisc library where I can put source files that are
used by multiple programs within the source tree.
Add enough rules to parse a simple VHDL program:
Parse library and use clauses,
Parse entity declarations, and
Parse architecture bodies.
Add some parser infrastructure:
Handle syntax errors with useful error messages,
Include file name and line numbers in parse errors,
Add some parser debug aids.
Pawel Szostek
Cary R
Jared Casper
Stephen Williams