Subject: Re: Linker (ld) seems to ignore certain LDFLAGS during configure
To: None <tech-pkg@NetBSD.org>
From: Klaus Heinz <email@example.com>
Date: 02/19/2005 00:20:29
Eric Boutilier wrote:
> I'm perplexed by a problem where a configure script is not able to
> find a library. The error message is:
> ld: fatal: library -lcrypto: not found
> As a result, the package (curl) gets built w/out SSL support.
> I'm trying to make the build find the libcrypto.so library which,
> on Solaris 10, resides in /usr/sfw/lib.
> I've tried to troubleshoot the problem but I'm still stumped. The
> LDFLAGS are set properly (see below) to include:
> -L/usr/sfw/lib -Wl,-R/usr/sfw/lib
> And in order to confirm that this setup should work, I copied the
> compile command and flags verbatim out of config.log (copied below)
> and ran it manually from a command line. When I do that, it
> compiles (finds libcrypto.so) just fine.
> Very weird... at least for me. :-/
Pkgsrc tries very hard _not_ to let packages pick up arbitrary installed
files/libraries from the system where it is used to build packages from
source. To this end, pkgsrc uses a set of wrapper scripts for programs
like gcc, as, ld to sanitize the options the real compiler or linker
sees. This way, the toolchain only uses header files or libraries having
a symlink under pkgsrc/<category>/<package>/work/.buildlink/.
You can see this when you build a package:
===> Creating toolchain wrappers for spamassassin-3.0.2nb1
This also enables pkgsrc to support native toolchains (like Forte/SunOne):
the wrapper framework rewrites options for gcc, which most Makefiles
support, into options for the native compiler.
If a pkgsrc Makefiles needs a certain package as a prerequisite, it
includes the needed ../../<prerequisite_pkg>/buildlink3.mk file, which
creates the necessary symlinks under work/.buildlink/. If there is a
native version (eg, native OpenSSL), there is also a
../../<prerequisite_pkg>/builtin.mk that is then automatically included.
This file checks whether the native version fulfills all requirements
(eg, a certain patch level of OpenSSL). After this check, the
builtlink3.mk file creates the necessary symlinks, either to
the native files, or to the files from the pkgsrc package (under LOCALBASE,
In the case of your libcrypto.so, the wrappers stripped the LDFLAGS you
supplied off the list of parameters the real linker effectively used.
This explains, why it worked when you manually executed the compile
command from the config.log file: you did what "configure" _assumed_ to
do in config.log but what was really done by the wrapper scripts can be
seen in work/.work.log. Lines marked [*] are the original, and after
some intermediate steps lines marked with <.> are actually executed.
So, in order to use libcrypto.so from the base system, you need to
depend on OpenSSL and security/openssl/builtin.mk needs to
recognize the native OpenSSL files on Solaris. When this is done, the
real compiler/linker will see the linker flags and the native library will
have a symlink under work/.buildlink/lib/.