From: Hans-Bernhard Broeker <broeker AT physik DOT rwth-aachen DOT de>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: problems making linux build/host for target msdosdjgpp
Date: 7 Nov 2002 16:09:27 GMT
Organization: Aachen University of Technology (RWTH)
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

Charles Wilkins <chas AT pcscs DOT com> wrote:

> as every C++ programmer knows, the C++ standard library does in fact
> include C with few exceptions.

You're partly mixing up the library implementation with library usage.
Yes, C++ does let you use C standard library functions.  But no, that
does not mean a C++ compiler maker, or even a C++ runtime maker, must
supply its own copy of an implementation of the C libraries.  You just
have to make sure that some implementation exists, and is found by the
compiler / linker.

> Isn't the ANSI / ISO C++ Standard Libray ( libstdc++ ) along with its
> headers (non-deprecated or 'C++ified' headers and STL headers)
> supposed to build with the linux hosts crossgcc.

Yes, it is.  *If* it's built at all, that is.  All that really matters
in the end is that you have a set of headers and library files. It
doesn't matter where it came from.

> I just want to be clear that I will be able to build a cross gcc that
> makes DOS executables with the same full C++ support that a natively
> built GCC-3.2 can do. 

It should be possible, indeed.  But getting it done may require more
insight into the GCC build process' intricacies than either you or I
have, off the top of our heads.  Andris should be able to provide more
insight, but he doesn't seem to be listening right now.

>>You might just cheat and install the libraries of the native DJGPP GCC
>>build, of course.
> I tried linking against them and it didn't work.

Linking alone won't be enough.  You'll have to use the natively built
headers, too, than.  And put them in a place that makes absolutely
sure they're found, instead of the host system's ones.

-- 
Hans-Bernhard Broeker (broeker AT physik DOT rwth-aachen DOT de)
Even if all the snow were burnt, ashes would remain.