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From: David Abrahams (dave_at_[hidden])
Date: 2007-02-21 15:51:12

Roland Schwarz <roland.schwarz_at_[hidden]> writes:

> David Abrahams wrote:
>> That is,
>> when building from a cygwin bjam, the default would be not to pass
>> -mno-cygwin, and when building from a Win32 bjam,
> Sorry don't understand. What exactly do you mean by a "cygwin bjam" or
> "win32 bjam"?

I mean a bjam that was itself built under cygwin or win32, and meant
to be run from either the cygwin bash shell or the win32 CMD shell,

> What would be the default when I invoke

Invoke bjam?

> from CMD.EXE (I guess win32 bjam, but could also be cygwin bjam)

The former.

> using C:\Cygwin\bin\g++.exe?

Using how?

If bjam were invoked from CMD.EXE, the default would be to pass

>> the default would
>> be to pass -mno-cygwin. In either case, the default would be
>> overridable by passing target-os=...
> Hmm, would this allow e.g
> bjam toolset=gcc-3.4.4-cygwin,gcc-3.4.4 stage
> if I want both cygwin and "native" target os?

Something like that.

>> * If we drop the ability to arbitrarily choose a version string, we
>> need a way to identify different configurations of a toolset that
>> may have the same version number. For example:
> [snipped examples]
>> The solution we came up with is to add an optional argument to
>> "using" that allows you to create a special toolset subfeature
>> on-the-fly, something like:
>> using gcc : 3.4 : /usr/local/conceptgcc/bin/g++ : conceptgcc ;
>> This feature could then also be used to identify the toolset on the
>> command-line, something like:
>> bjam toolset=conceptgcc
> We need something
> 1) library authors can use to mark up in explicit-failures-markup.xml
> 2) library authors can use in Jamfiles.

For both they can use the primary toolset name and build properties.

> For 1) a kind of simple pattern matching is
> available. e.g. gcc-cygwin*


> (Will the subfeature be visible in this context?)

Which context?

> For 2) a similar substring matching sometimes looks advantageous. But I
> do not know if this just would be kind of opening Pandoras box.

Sorry, I'm not sure what you're driving at.

Dave Abrahams
Boost Consulting

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