Many/most operating systems require that anything linked into a shared
library be compiled as PIC. The only way that libtool can be sure
that the code in a library is compiled as PIC is if it is also a
shared library. Some system linkers will reject linking against
static libraries when building a shared library. Modules are usually
shared libraries themselves so they observe the rules for building
shared libraries.
This is a libtool "feature" rather than a "bug".
There are system-dependent ways that libtool could work around this
problem for many systems, but it would be a lot of work to implement.
Bob
On Sun, 23 Feb 2003, Brad House wrote:
Seems to be a bug in libtool 1.4.3 when linking a module if you want
to use symbols out of an archive. For example, inside of a package
that uses autoconf/automake/libtool, a command executes:
/bin/sh ../libtool --mode=link gcc -g -O2 -o module_ssl.la -rpath \
/usr/local/lib -module -avoid-version module_ssl_la-module_ssl.lo \
/usr/local/ssl/lib/libcrypto.a /usr/local/ssl/lib/libssl.a
This message appears:
*** Warning: Trying to link with static lib archive
/usr/local/ssl/lib/libcrypto.a.
*** I have the capability to make that library automatically link in when
*** you link to this library. But I can only do this if you have a
*** shared version of the library, which you do not appear to have
*** because the file extensions .a of this argument makes me believe
*** that it is just a static archive that I should not used here.
And does NOT link against libssl.a or libcrypto.a
But when I:
gcc -O2 -fno-common -flat_namespace -bundle -undefined suppress \
-o module_ssl.so module_ssl.c /usr/local/ssl/lib/libcrypto.a \
/usr/local/ssl/lib/libssl.a
This module links perfectly, and is fully loadable within my
main program.
Any assistance here would be greatly appreciated. I'd really rather
not link against .dylib's as especially for SSL, I use 0.9.7a, and
don't want to overwrite the dylibs Apple provides in /usr/lib,
and the linker NEVER wants to link against the right dyamic version.
-Brad
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Bob Friesenhahn
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