Re: glibc version dependencies

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glibc version dependencies
\ Michael T (18 Jan 2007)
. \ Ian Lance Taylor (18 Jan 2007)
. . \ Michael T (18 Jan 2007)

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Subject:	Re: glibc version dependencies
Group:	Gcc-help
From:	Michael T
Date:	18 Jan 2007

Hello Ian,

Thanks very much for the answer. I have just been looking at how autobuild
do it with their apgcc wrapper (haven't looked at g++ yet, I went C only to
avoid that one :). Basically, when I did

apgcc [file] [args]

it translated that to

gcc -I/usr/local/include/apbuild -include
/usr/local/include/apbuild/apsymbols.h \
-DAPBUILD_VERSION="2.0.2" [file] \

-Wl,--enable-new-dtags,--rpath,${ORIGIN}/../lib,--rpath,${ORIGIN}/../lib/autopac kage
\
-shared-libgcc -Wl,--as-needed [args]

The apbuild include directory contains a GNU ctype.h (seems to be modified
to eliminate some version dependencies) and apsymbols.h, which contains a
lot of lines similar to

__asm__(".symver __duplocale,__duplocale");

It also adds various libraries in /usr/libexec/autopackage -
libcurl.so.2.0.2, libgcc_s.so.1, libstdc++.so.5.0.2, libstdc++.so.6.0.5 and
libuau.so.3.0.0. I presume that these override the standard libraries
either at link or at runtime and are more "compatible" versions.

Just thought I would post this in case it interests anyone.

Regards and thanks,

Michael

> > So my question: can anyone tell me a good way to produce a binary
> > which is glibc 2.2 compatible, other than building on a glibc 2.2
> > system? What determines which version of glibc is required by the
> > binary? (BTW, I do supply source code as well, but I would like to
> > build a binary for people's convenience).
>
>Unfortunately glibc is not forward compatible, and unfortunately there
>is no way to restrict yourself to an older version of glibc. I only
>know of two ways to build a program which only relies on glibc 2.2.
>The first and simplest is the one you mention: do the build on a glibc
>2.2 system. The second is to build a cross-compiler to a glibc 2.2
>system; this is most easily done using crosstool.
>
>Ian

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