[Simh] simh make file

[Peter Lund]

On Tue, 2007-10-02 at 21:58 -0400, Davis Johnson wrote:

> I've attached the makefile I use to build for Linux (Slackware,
> various ports), Solaris-10 and OS/X.
> 
> It is far from ideal, but there are a few points interest. I'll quote
> the relevent snipet for discussion:
>         ifeq ($(WIN32),)
>           #Unix Environments
>           ifneq (,$(findstring solaris,$(OSTYPE)))

Ah, yes, you can also use findstring.  I'd forgotten about that
function.

>             OS_CCDEFS = -lm -lsocket -lnsl -lrt -lpthread
>         -D_GNU_SOURCE
>           else
>             ifneq (,$(findstring darwin,$(OSTYPE)))

Yep, someone else told me (by private email) about 'darwin' after I
posted the "Platform tests" email.

"macos" is apparently very old, from before OS X.

>               OS_CCDEFS = -D_GNU_SOURCE
>             else
>               OS_CCDEFS = -lrt -lm -D_GNU_SOURCE
>             endif
>           endif

I see you like indentation, too ;)
One of those new-fangled things that came in fashion in the seventies.

>           CC = gcc -std=c99 -U__STRICT_ANSI__ -g $(OS_CCDEFS) -I .
>           ifeq ($(USE_NETWORK),)
>           else
>             NETWORK_OPT = -DUSE_NETWORK
>         -isystem /usr/local/include /usr/local/lib/libpcap.a
>           endif
>         else
>           #Win32 Environments
>           LDFLAGS = -lm -lwsock32 -lwinmm
>           CC = gcc -std=c99 -U__STRICT_ANSI__ -O0 -I.
>           EXE = .exe
>           ifeq ($(USE_NETWORK),)
>           else
>             NETWORK_OPT = -DUSE_NETWORK -lwpcap -lpacket
>           endif
>         endif
>         
>      1. OSTYPE isn't universally set, it may be a bash-ism. It doesn't
>         get set by the default Bourne shell on Solaris, for example.
>         This doesn't bother me much, I always run bash if available
>         anyway. There was at least one fellow on the simh-dev list who
>         compiles simh for VMS and thinks running bash on VMS is an
>         abomination.

Well, it is.

>      1. OSTYPE isn't exported by bash by default. Many people export
>         it in their .profile, you can export it manually, or you can
>         set it on the make command line.
>      2. bash on both my OS/X and Solaris systems include version
>         numbers in the OSTYPE, thus the findstring in the above
>         conditionals.
>      3. Solaris 10 ships with no fewer than three versions of make.
>         Only gmake (GNU make) works for this makefile. The other two
>         spit out cryptic errors I'm insuficiently motivated to decode.

Yep.  I figured that since the current makefile requires GNU make (or
something like it) anyway, we might as well rely on it as the primary
build script.

>      1. The above snipit shows my linux bias - the default for other
>         os not detected is the linux option. I should detect linux and
>         the not found branch should have no libraries specified, like
>         the default in the stock makefile.

The current default choice in the stock makefile is used for both Mac OS
X, cygwin, and Linux :(

>      1. I don't think I did anything to break the windows build, but I
>         don't know that for a fact.
>      2. Note that bash on OS/X sets OSTYPE to darwin, not macos.
>      3. I really want to build for one of the BSDs.  I think I've got
>         somthing arround here that should run one of the BSDs. I think
>         one of the solaris versions of make that doesn't work (see 4
>         above) is a BSD make. 

Ah, this brings up the next step in my Cunning Plan.
I can actually make the primary build script generate simpler build
scripts for the dumber platforms.

I have made some proof-of-concept tests and it is actually possible
(it's not even hard).

I intend to generate a BAT file that is just a linear list of
compile/link invocations (with shell variables for the actual programs
to run), a shell script that is similar, a simple makefile that can be
used by any standard make, and possibly a descrip.mss.

The simpler scripts will need a bit of tailoring at the top to make them
invoke the right compiler/linker so they won't work right out of the box
but on the other hand, they should be simple to modify.

The primary build script should be a pleasure to use on the main
platforms (Mac, Cygwin, Linux) and in general Just Work out of the box.

-Peter