PLI 1 was deprecated in 1364-2005, so disable by default and note that
it is deprecated in the help text.
This works round the problem that the clang linker (lld) in MSYS2 does
not support the -r option, so cannot be used to build libveriuser.a.
The clang dlltool is not compatible with the binutils dlltool. However
both the clang and binutils linkers support reading the .def file and
creating the import library directly, so we no longer need to perform
the link in two stages.
When redirection operators are included in a command string passed to
the system() subroutine, it spawns an intermediate shell to handle the
redirection. This is particularly inefficient when running the tests
in MSYS2. Creating our own version of system() based on fork() and
exec() allows us to handle the redirection directly.
We need to build libvvp with a suffix from the outset to ensure that
the vvp binary searches for the correct library file name once it is
installed.
Also Windows DLLs need to be stored in the same directory as the main
program, not in a separate lib directory.
Commit 95810b2f61 mistakenly added the suffix to the output file name
when linking the final vvp.exe binary. 'make check' and 'make install'
assume the suffix is only added when installing.
The tgt-vvp code generatpr outputs identifiers as quoted strings, and
because of this, escapes any " and \ characters (which may appear in
escaped indentifiers). We need to undo this when reading them into
vvp, so that the original name is seen by the VPI routines.
These were implemented as returning nothing (void), and passing an
invalid operation value would trigger an assertion failure. The IEEE
standards define them as returning 1 on success and 0 on failure.
vpi_sim_control() is the name used in Verilog-AMS. Strictly speaking
it should return a bool, but to avoid polluting the namespace by
including stdbool.h, we return a PLI_INT32. As C is a weakly typed
language, this should make no practical difference.
The existing elaboration code only allowed assignments from/to individual
elements and either failed an assertion (when assigning the entire array)
or failed to compile (when assigning an array slice).
Martin Whitaker
Cary R
Wilson Snyder