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List:       redhat-devel
Subject:    Question about versions of libstdc++
From:       "Yuval Kfir" <yuvalk () mainsoft ! com>
Date:       2002-08-12 5:49:45
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Hello,
I'm confused by the multitude of versions of libstdc++ I find on my Red Hat
Linux installation, and the purpose of each one.  Basically, my question
is: which of these supersedes which, and which is the latest?  My problem
is a run-time incompatibility between a module I compile here, which uses
libstdc++.a.2.10.0, and the Java VM on RHL, which uses
libstdc++-libc6.1-1.so.2.  I was thinking of using the .so library for my
modules too, but now I have a feeling this is actually an *older* library.

For example, I have:

/usr/lib 113% ls -F libstdc++*
libstdc++-2-libc6.1-1-2.9.0.a     libstdc++-libc6.2-2.so.3@
libstdc++-2-libc6.1-1-2.9.0.so*   libstdc++.so.2.7.2@
libstdc++-3-libc6.2-2-2.10.0.a    libstdc++.so.2.7.2.8*
libstdc++-3-libc6.2-2-2.10.0.so*  libstdc++.so.2.8@
libstdc++-libc6.1-1.a.2@          libstdc++.so.2.8.0*
libstdc++-libc6.1-1.so.2@         libstdc++.so.2.9@
libstdc++-libc6.2-2.a.3@          libstdc++.so.2.9.dummy*

And under /usr/lib/gcc-lib (in subdirs) I have libstdc++.{so,a} pointing
backwards to various versions in /usr/lib.

The funny thing is, when I installed GCC 2.95.3 from scratch, I only got
/usr/gcc/2.95.3/lib/libstdc++.a.2.10.0.  No .so version.

So, to summarize my questions:
1. Which is the newer version? How do I interpret the various numbers in,
   e.g., libstdc++-2-libc6.1-1-2.9.0.so ?
2. If, as I suspect, libstdc++.a.2.10.0 is the newest version, where do I
   get an .so version of it?
3. Where can I find information on compatibility issues between these
   versions?

Many thanks in advance for any information,
- Yuval
--
Yuval Kfir, Software Engineer (Platforms Team)
Mainsoft Corporation
tel 972-8-9781300 (ext. 338)
fax 972-8-9219389





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