[m-dev.] for review: README.VisualC++

[Peter Ross]

Here is my accumulated knowledge about compiling using MSVC.  Feel free
to rewrite it for me.

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INTRODUCTION

Mercury is in the process of being ported to use the Microsoft Visual C++ 6
compiler.  However not all dependencies on Cygwin have been removed and
cygwin is still required for installation (see README.MS-Windows).

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CONFIGURATION

To use MSVC to build the compiler issue the following configure command.

CC='CL /nologo' CPP='CL /nologo /E' configure

Currently the only grade that will compile is `hlc.gc'.

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INSTALLING ON NETWORK DRIVES

If you want to install on the machine, foo, in the directory \usr\local
you need to add `--prefix //foo/usr/local' as an option to configure.

Then ensure that the directory that you wish to install into is mounted
somewhere, ie

mount //foo/usr/local /temp_mount_point

and then use that mount point as the location to install into

make install INSTALL_PREFIX=/temp_mount_point

This avoids the problem that

	mkdir -p //foo/usr/local/xxx

fails.

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NONE.* GRADES

Are not supported yet! But if they were and you have a file with a large
switch in it you need to pass the following flag to mmc

--max-jump-table-size 512


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