compiling in vhdl mode within emacs

Question

Description:

I am currently running emacs on unix (mac osx) and I write vhdl code in emacs vhdl mode. However when I compile I get the error code:

vcom -93 -work work /path
/bin/bash: vcom: command not found

Compilation exited abnormally with code 127 at DATE TIME

I want to be able to compile vhdl code in vhdl mode. What am I doing wrong? Please provide detailed answer. If you know how to fix this problem please give me step by step instructions on how to do the same as I don't know what is wrong.

To be a little less obtuse compiling a vhdl design file entails analyzing that design with an external tool. There's vhdl-mode.el that specifies which tools and the default is in general Modelsim, whose compiler is vcom. Modelsim hasn't been ported to OS X and a quick google doesn't show anyone doing remote execution to a host operating system to which it has been been ported. There are versions of vhdl-mode.el using different VHDL tools. The only VHDL tools I'm aware of that run natively on OS X are ghdl and nvc. — user1155120
– user1155120, Commented Feb 28, 2014 at 5:54

user1155120 · Accepted Answer · 2014-02-28 07:00:08Z

2

There's a Mac OS X Emacs app found at GNU Emacs For Mac OS X, a universal binary that will run from OS X 10.6.8 to 10.9.2. It's vhdl-mode configuration includes ghdl should you have it installed. I'm afraid I haven't used emacs since the great schism between Gnu and a commercial concern in the '80s. I'm a joe or TextMate user myself these days (both of which can handle VHDL syntax, can be user configured (with a bit of googling and reading). The vhdl-mode appears to expect you to set up a Makefile (through menu items and the external VHDL tool). You can generally analyze the current buffer directly. Creating a Makefile isn't exactly simplistic and is outside the scope of my experience (I went and read several vhdl-mode.el versions before answering, I said I'm not an emacs user).

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Notice it found out which VHDL tools were available and used ghdl. This is a function found in the vhdl-mode.el file.

If you're running 10.9 Mavericks there's ghdl-0.31 from ghdl-updates. An mcode version of ghdl-0.29 that can run on OS X 10.6 - 10.9 can be found at Tristan's old ghdl site - GHDL for Mac OS X.

A gtkwave app for OS X can be found on Tony Bybell's GTKWave SourceForge page.

I understand vhdl-mode.el and (.elc, etc. files) are sensitive to which version of Emacs you're using. They may not be particularly portable between the Emacs.app (24.3) and /usr/bin/emacs (22.1.1). If that's not the case I'm sure someone will chime in.

answered Feb 28, 2014 at 7:00

user1155120

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4 Comments

user1155120 Over a year ago

And from looking at the -ieee=synopsys flag passed to ghdl, I'd be tempted to edit vhdl-mode to remove it.

youR.Fate Over a year ago

@DavidKoontz, you don't need to edit VHDL mode for that, you only need to change the compiler configuration for GHDL (VHDL -> Compile -> Compiler -> Customize Compiler...)

user1155120 Over a year ago

@youR.Fate - out of curiosity, where are those changes stored if not the vhdl-mode.el file?

youR.Fate Over a year ago

@DavidKoontz those changes are stored in your emacs init file, or your emacs-custom file, if you have configured emacs to use one. How to do that is described here: gnu.org/software/emacs/manual/html_node/emacs/…. I personally use .emacs.d/emacs-custom.el.

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