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readme.txt
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readme.txt
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Note: This information and much more is now in the Open Watcom Developer's
Guide. To produce a PostScript version go to docs\ps and run
wmake hbook=devguide
If you have everything set up correctly, you should end up with devguide.ps
which you can print or view.
-------------------------------------------------------------------------------
Getting up to Speed on Open Watcom
==================================
Here's a quick intro on the build layout and build process. Original
Sybase build tree was more or less fixed to d:\, Open Watcom is more
flexible and the build tree root can be located anywhere. Where this
file refers to d:\, substitute your Open Watcom root location (stored
in the owroot environment variable).
1) Default build machine layout:
d:\
bld - this is the root of the build tree
each project we build has a subdirectory under d:\bld
for example:
d:\bld\cg - code generator
d:\bld\cc - C compiler
d:\bld\plusplus - C++ compiler
etc. (see projects.txt for details)
rel2 - this is where the software we actually ship gets copied
after it is built - it matches the directory structure of our
shipping Open Watcom C/C++/FORTRAN tools. Note: the rel2
directory structure is created on the fly.
bat - batch files, many of which aren't used anymore
of most interest are the .ctl files - scripts for the "builder"
tool (see below) and make init files (makeint et al.).
docs - here is everything related to documentation, sources and tools
distrib - contains manifests and scripts for building binary
distribution packages
contrib - 3rd party source code which is not integral part of
Open Watcom. Contains primarily several DOS extenders.
------------------------------
2) To set up a new machine, modify setvars.bat/setvars.cmd/setvars.sh to
reflect your setup. See comments within the file for additional
information.
Your path should look something like this if you are on NT:
PATH=C:\WINNT\system32;
C:\WINNT;
d:\bat;
d:\lang\binnt;
d:\lang\binw;
d:\bin;
d:\tools;
d:\bld\build\binnt
WARNING: Some platforms (notably Windows 9x) require DOS style line endings
in batch files. If source files were moved from a UNIX platform. as is the
case with ow_daily.tar.bz2, you must make sure that line endings are
properly converted. Loading the batch files in an editor such as EDIT and
saving them is one way to do this.
------------------------------
3) Priming the pump:
Besides the Open Watcom C/C++ 1.x binaries you'll need a few other executables
used by the build process, primarily builder. The source is in \bld\builder.
Run wmake in the directory corresponding to your host platform and if you set
up everything properly, the executables will be built and copied to the
right place. Perhaps someone will fully automate this process one day. For
now please consider it an aptitude test.
------------------------------
4) Build process:
----
Linux note - build process on Linux is somewhat different. It uses gcc to
bootstrap Open Watcom, ie. wmake, the C compiler and several other utilities
are first built using gcc, then the rest of the tree is built using the
freshly created Open Watcom tools. See the build.sh script in the root of
the source tree - it should take care of everything.
----
WGML OW tool is still only available as DOS version that on some host platform
DOS emulator need to be installed to be able to do a complete build.
Under Linux, DOSEMU and FREEDOS or DOSBOX need to be installed.
Under 64-bit Windows or 32-bit Windows without DOSX emulator, DOSBOX need
to be installed.
----
We use the Open Watcom C/C++ compilers and Open Watcom wmake to build our
tools, but at the top level we have a tool which oversees traversing the
build tree, deciding which projects to build for what platforms, logging
the results to a file, and copying the finished software into the release
tree (rel2), making fully automated builds a possibility.
This tool is called builder.
See d:\bld\builder\builder.doc for detailed info on the tool and the source
if the documentation doesn't satisfy you.
Here's how we use it:
Each project has a "lang.ctl" builder script file.
If you go to a project directory and run builder, it will make only that
project; if you go to \bld and run builder, it will build everything
the overall build uses \bat\lang.ctl which includes all of the individual
project lang.ctl files that we use. Note that if you run builder, it will
traverse directories upwards until it finds a lang.ctl (or it hits the
root and still doesn't find anything, but then you must have done something
wrong).
Results are logged to "build.log" in the current project directory (or d:\bld),
the previous build.log file is copied to build.lo1.
Common commands:
builder build - build the software
builder rel2 - build the software, and copy it into the "rel2" release tree
builder clean - erase object files, exe's, etc. so you can build from scratch
Many of the projects use the "pmake" features of builder (see builder.doc).
To determine what to build, pmake source is in \bld\pmake.
Each makefile has a comment line at the top of the file which is read by pmake.
Most of our lang.ctl files will have a line similar to this:
pmake -d build -h ...
this will cause wmake to be run in every subdirectory where the makefile
contains "build" on the #pmake line.
You can also specify more parmeters to build a smaller subset of files. This
is especially useful if you do not have all required tools/headers/libraries
for all target platforms.
For example:
builder rel2 os_nt
will (generally) build only the NT version of the tools.
A word of warning: running a full build may take upwards of two hours on
a ~1GHz machine. There is a LOT to build! This is not your ol' OS kernel
or a single-host, single-target C/C++ compiler.
It is generally possible to build specific binaries/libraries by going to
their directory and running wmake. For instance to build the OS/2 version
of WLINK you can go to \bld\wl\os2386 and run wmake there (note that the
process won't successfully finish unless several required libraries are built).
Builder is useful for making full builds while running wmake in the right spot
is handy during development.
------------------------------
5) Getting more information:
If you have any further questions (and you will if you're serious), visit
http://www.openwatcom.org/ and subscribe to the Open Watcom newsgroups at
news://news.openwatcom.org/, particularly openwatcom.contributors.