boost jam, minGW and msys.

From: ANDREW MARLOW, BLOOMBERG/ LONDON OF (amarlow1_at_[hidden])
Date: 2005-06-07 05:42:29

Gentlemen,

I think there may be a way forward with the problems
I have been having with boost jam on minGW.
I think the build needs to have an additional
environment and associated macro.
I propose that the environment "mingw" is used to
mean mingw-built for use with a DOS prompt,
and that the new environment "mingw-msys" is used
to mean mingw-built for use in the minGW msys shell.

If mingw-msys is set this needs to cause jam.h to define
a new macro, MINGW_MSYS, which can be used by the
other source files to determine which aspects of
DOS and Unix are selected. Some DOS-ism still
need to be kept. For example, the stuff to scan
unix archives is only available in Posix-like environments.

-Andrew M.