Notes on porting Jam - revised 11/11/97
1) Working out system dependencies in the Jam code.
Jam's OS footprint is fairly small. For OS independent work Jam
liberally uses standard libc functions like stdio, malloc, and
string. The OS dependent interfaces are:
file_parse() - split a file name into dir/base/suffix/member
file_build() - build a filename given dir/base/suffix/member
file_dirscan() - scan a directory for files
file_archscan() - scan an archive for files
file_time() - get the timestamp of a file, if not already
done by file_dirscan().
execcmd() - execute a shell script
execwait() - wait for any outstanding execcmd()'s.
The current implementations are:
filemac.c - mac MPW
filent.c - NT
fileos2.c - OS/2
fileunix.c - all UNIX
filevms.c - VMS
execmac.c - mac MPW
execunix.c - UNIX, OS/2, NT
execvms.c - VMS
2) Defining OTHERSYMS in jam.h
So that the Jambase and Jamfile know their host, Jam defines $(OS)
to be something useful for each platform. Make sure that there is
code in jam.h to generate a useful value for $(OS), and key it off
the platform specific C-preprocessor symbol. If the C-preprocessor
doesn't itself defines such a symbol, add a define to the Makefile.
In addition to $(OS), you can also set $(OSPLAT) if the OS runs on
multiple platforms (like Linux or NT), or $(OSVER) if the OS has
multiple, incompatible releases, like HPUX 9 and 10 and AIX 3 and 4.
3) Working out system dependencies in the Jambase
With the value of $(OS) available, the Jambase can be extended to
support special variables or rules for new platforms. See the
current support for VMS, NT, and Mac.
4) Yacc troubles
The generated files jamgram.h and jamgram.c are distributed for the
poor souls without yacc.
5) Known problematic systems:
- Pyramid has no malloc.h, memory.h
- Encore has no stdlib.h
- Bull DPX has sys/file.h problems
6) Send the results back.
If you do porting work, the result can be integrated into future
releases if you send it back to the author's adress in the README.
Jam 2.3. See RELNOTES for a list of changes from 2.2.x.
Just about every source file was touched when jam got ANSI-fied.
Jeff Sickel's Mac OS X port.
Add Jam/MR 2.2 source