iverilog-vpi - Compile front end for VPI modules
iverilog-vpi [--name=name] sourcefile...
iverilog-vpi is a tool to simplify the compilation of VPI modules for
use with Icarus Verilog. It takes on the command line a list of C or
C++ source files, and generates as output a linked VPI module. See the
vvp(1) man page for a description of how the linked module is loaded by
The output is named after the first source file. For example, if the
first source file is named foo.c, the output becomes foo.vpi.
iverilog-vpi accepts the following options:
Include the named library in the link of the VPI module. This
allows VPI modules to further reference external libraries.
Add directory to the list of directories that will be search
for header files.
Define a macro named define.
Normally, the output VPI module will be named after the first
source file passed to the command. This flag sets the name
(without the .vpi suffix) of the output vpi module.
This flag causes the program to print the install directory for
VPI modules, then exit. It is a convenience for makefiles or
automated plug-in installers.
--cflags, --ldflags and -ldlibs
These flags provide compile time information.
The PC port of iverilog-vpi includes two special flags needed to
support the more intractable development environment. These flags help
the program locate parts that it needs.
Tell the program the root of the Mingw compiler tool suite. The
vvp runtime is compiled with this compiler, and this is the
compiler that iverilog-vpi expects to use to compile your
source code. This is normally not needed, and if you do use it,
it is only needed once. The compiler will save the path in the
registry for use later.
Set for the use during compilation the root if the Icarus
Verilog install. This is the place where you installed Icarus
Verilog when you ran the installer. This flag is also only
needed once, and the path is stored in the registry for future
The UNIX version of iverilog-vpi includes additional flags to let
Makefile gurus peek at the configuration of the iverilog installation.
This way, Makefiles can be written that handle complex VPI builds
natively, and without hard-coding values that depend on the system and
installation. If used at all, these options must be used one at a
time, and without any other options or directives.
Print the compiler flags (CFLAGS or CXXFLAGS) needed to compile
source code destined for a VPI module.
Print the linker flags (LDFLAGS) needed to link a VPI module.
Print the libraries (LDLIBS) needed to link a VPI module.
-m32 On 64bit systems that support it (and support vvp32) this flag
requests a 32bit vpi binary instead of the default 64bit
Example GNU makefile that takes advantage of these flags:
CFLAGS = -Wall -O $(CFLAGS_$@)
VPI_CFLAGS := $(shell iverilog-vpi --cflags)
CFLAGS_messagev.o = $(VPI_CFLAGS)
CFLAGS_fifo.o = $(VPI_CFLAGS)
messagev.o fifo.o: transport.h
messagev.vpi: messagev.o fifo.o
Steve Williams (firstname.lastname@example.org)
iverilog(1), vvp(1), <http://www.icarus.com/eda/verilog/>,
Copyright © 2002-2009 Stephen Williams
This document can be freely redistributed according to the terms of the
GNU General Public License version 2.0
April 17th, 2009 iverilog-vpi(1)