Re: [boost] Library Federation

Subject: Re: [boost] Library Federation
From: Robert Ramey (ramey_at_[hidden])
Date: 2018-08-11 21:18:35

On 8/11/18 1:12 PM, Andrey Semashev via Boost wrote:

> Just for the record, gcc has CPATH and not INCLUDE. clang, probably, 
> too, though I didn't check. Syntax is probably different from MSVC's 
> INCLUDE, too.

I'm aware of this.  I just didn't want to get into all the details.

> 
> Also, I might be mistaken, but I thought there was a rather short limit 
> on the env. variable length on Windows, which may come into play with 
> variables like PATH or INCLUDE.

apparently its 8K on windows and something greater then 64K on linux.

> I'm not quite sure what exactly you are proposing.
> 
>  From my experience, when I was developing Boost.Log, I simply symlinked 
> its tree into my Boost tree and had almost no problems with that setup. 
> I didn't even have to run `b2 headers` whenever I added a new header to 
> the library because `boost/log` was already a symlink to my 
> `include/boost/log` directory. So in my case, this setup was mostly 
> painless.

Right - that's what we all do regardless of whether one does it by 
"hand" or via b2 headers.
> 
> I'm sure I wouldn't want to construct a setup based on environment 
> variables because, as I usually do, I wouldn't want to modify my default 
> environment this way. This would affect my work with other projects. 
> Which would force me to create a special environment for working with 
> Boost, which would just add more hassle.

Actually this is a big part of my motivation.  I work on multiple 
projects.  Boost stuff, non-boost C++, embedded systems, and fiddling 
with non-boost libraries. These use different tools and different 
compilers - even if C/C++.  So I have to have different environment, 
path variables, etc for each one.  I have a system which maintains all 
these is a "project configuration file"  so I can easily suspend work on 
one project and switch to another.  Takes about 1 second. So for me this 
is a natural way to do things.

Robert Ramey