[Simh] simh make file

[Davis Johnson]

The makefile subject comes up all the time, especially after Bob pushes 
out a new version.

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,$(OSTYPE)))
        OS_CCDEFS = -lm -lsocket -lnsl -lrt -lpthread -D_GNU_SOURCE
      else
        ifneq (,$(findstring darwin,$(OSTYPE)))
          OS_CCDEFS = -D_GNU_SOURCE
        else
          OS_CCDEFS = -lrt -lm -D_GNU_SOURCE
        endif
      endif
      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.
   2. 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.
   3. bash on both my OS/X and Solaris systems include version numbers
      in the OSTYPE, thus the findstring in the above conditionals.
   4. 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.
   5. 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.
   6. I don't think I did anything to break the windows build, but I
      don't know that for a fact.
   7. Note that bash on OS/X sets OSTYPE to darwin, not macos.
   8. 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. 
   9. I don't build with the optional networking support, the emulator I
      am most interested in (id32) does not use it.


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