Re: [Buildroot] [PATCH 1/1] package/zabbix: fix BR2_SHARED_STATIC_LIBS

[Thomas Petazzoni via buildroot <buildroot@buildroot.org>]

Hello Fabrice,

On Tue, 31 May 2022 21:07:02 +0200
Fabrice Fontaine <fontaine.fabrice@gmail.com> wrote:

> --static is added to pkg-config call with BR2_SHARED_STATIC_LIBS
> resulting in the following build failure with openssl or libcurl:
> 
> configure:13132: /home/autobuild/autobuild/instance-6/output-1/host/bin/or1k-buildroot-linux-gnu-gcc -o conftest -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -Ofast -g0  -I/home/autobuild/autobuild/instance-6/output-1/host/or1k-buildroot-linux-gnu/sysroot/usr/include -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -rdynamic  -static -L/home/autobuild/autobuild/instance-6/output-1/host/or1k-buildroot-linux-gnu/sysroot/usr/lib conftest.c -lssl -lcrypto -lm   >&5
> /home/autobuild/autobuild/instance-6/output-1/host/lib/gcc/or1k-buildroot-linux-gnu/10.3.0/../../../../or1k-buildroot-linux-gnu/bin/ld: /home/autobuild/autobuild/instance-6/output-1/host/or1k-buildroot-linux-gnu/sysroot/usr/lib/libcrypto.a(dso_dlfcn.o): in function `dlfcn_globallookup':
> dso_dlfcn.c:(.text+0x2c): warning: Using 'dlopen' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
> /home/autobuild/autobuild/instance-6/output-1/host/lib/gcc/or1k-buildroot-linux-gnu/10.3.0/../../../../or1k-buildroot-linux-gnu/bin/ld: /home/autobuild/autobuild/instance-6/output-1/host/or1k-buildroot-linux-gnu/sysroot/usr/lib/libcrypto.a(b_addr.o): in function `BIO_lookup_ex':
> b_addr.c:(.text+0x1128): warning: Using 'getaddrinfo' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
> /home/autobuild/autobuild/instance-6/output-1/host/lib/gcc/or1k-buildroot-linux-gnu/10.3.0/../../../../or1k-buildroot-linux-gnu/bin/ld: /home/autobuild/autobuild/instance-6/output-1/host/or1k-buildroot-linux-gnu/sysroot/usr/lib/libcrypto.a(b_sock.o): in function `BIO_gethostbyname':
> b_sock.c:(.text+0x90): warning: Using 'gethostbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
> /home/autobuild/autobuild/instance-6/output-1/host/lib/gcc/or1k-buildroot-linux-gnu/10.3.0/../../../../or1k-buildroot-linux-gnu/bin/ld: /tmp/cceWHjDi.o: in function `main':
> conftest.c:(.text.startup+0x8): undefined reference to `SSL_connect'

Why is this error occurring in the first place? conftest.c has a main()
function calling SSL_connect(), and the gcc command line includes -lssl
-lcrypto. So why is gcc failing here?

> +# With BR2_SHARED_STATIC_LIBS=y, the generic infrastructure adds
> +# --static when calling pkg-config resulting in a build failure with
> +# libcurl or openssl. Adding --disable-static reverts this

This seems to paper over the real problem, but not to be an actual fix.

Thomas
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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