Path: utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!uunet!stanford.edu!msi.umn.edu!cs.umn.edu!kirchner
From: kirchner@umn-cs.cs.umn.edu (Roger B. Kirchner)
Newsgroups: comp.sys.next
Subject: Using C++ and installing libg++
Message-ID: <1991Apr27.083526.12027@cs.umn.edu>
Date: 27 Apr 91 08:35:26 GMT
Sender: kirchner@cs.umn.edu (Roger B. Kirchner)
Organization: University of Minnesota, Minneapolis, CSci dept.
Lines: 67

Several people responded to my query about including stdio.h in a C++
program.  The trick is to use extern:

extern "C"
{
  #include <stdio.h>
}

And the following post from Mark Adler on installing the gnu C++ libary
works as advertised:

-------------------------------------------
From: madler@nntp-server.caltech.edu (Mark Adler)
Subject: Re: where are libg++ sources? I tried, but....
Message-ID: <1991Apr13.080013.5302@nntp-server.caltech.edu>
Date: 13 Apr 91 08:00:13 GMT
References: <TY.91Apr13010352@reef.cis.ufl.edu>
Organization: California Institute of Technology, Pasadena
Lines: 47

Tyng-Jing Yang requests:
>> Is there anyone like to submit their patch files or working libg++

And ruin all your fun?!  Well, if you insist ...

How I installed the Gnu C++ library (your mileage may vary):

1.  Got libg++-1.39.0.tar.Z from prep.ai.mit.edu via anonymous ftp.
2.  In /me/tmp, I did: "zcat libg++-1.39.0.tar.Z | tar xvf -".  Did a
    "cd libg++-1.39.0".
3.  Created /usr/gnu, and /usr/gnu/lib (writable from me).
4.  Changed Makefile(32) to "PWD=/me/tmp/libg++-1.39.0", commented out
    Makefile(31) (inserted "#" in first column).
5.  Uncommented Makefile(93) to leave out the gnu malloc routines.
6.  Changed "GXX = g++" to "GXX = cc++" in Makefile(120).
7.  Changed "CC = gcc" to "CC = cc" in Makefile(124).
8.  Commented out Makefile(148) to kill verbosity flags.
9.  Did "make src" (takes a while--ignore the warnings).
10. Did "make install-lib" (puts libg++.a in /usr/gnu/lib).
11. Added these lines after line 2 in g++-include/time.h:
        #ifdef NeXT
        #define _TIME_H 1
        #endif
12. Did "make install-include-files" (this puts the include files in
    /usr/gnu/lib/g++-include).
13. Did "make tests" (this takes rather a lot of disk space).  There were
    differences from the expected output, but they appeared to just be
    precision problems.  I didn't investigate further.
14. Removed the directory in tmp ("cd .. ; rm -rf libg++-1.39.0").
15. Made a test program, x.cc, containing:
        #include <stream.h>
        main() {
          cout << "Hello world!\n";
        }
    and compiled it using:
        cc++ -I/usr/gnu/lib/g++-include -O x.cc -L/usr/gnu/lib -lg++
    and then:
        a.out
    printed:
        Hello world!
    How about that.

And then you can merrily cc++ to your heart's content.  Have fun.

Mark Adler
madler@pooh.caltech.edu
------------------------