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Re: [Qemu-devel] [RFC PATCH 1/4] configure: Improve libssh check
From: |
Pino Toscano |
Subject: |
Re: [Qemu-devel] [RFC PATCH 1/4] configure: Improve libssh check |
Date: |
Wed, 14 Aug 2019 14:36:43 +0200 |
On Wednesday, 14 August 2019 14:15:24 CEST Philippe Mathieu-Daudé wrote:
> The libssh pkg-config is not complete, the libraries required to
> link with libssh are not returned. For example on Ubuntu 18.04:
>
> $ dpkg -l|fgrep libssh
> ii libssh-4:arm64 0.8.0~20170825.94fa1e38-1ubuntu0.2 arm64 tiny C SSH
> library (OpenSSL flavor)
> ii libssh-dev 0.8.0~20170825.94fa1e38-1ubuntu0.2 arm64 tiny C SSH library.
> Development files (OpenSSL flavor)
>
> $ pkg-config libssh --libs
> -lssh
>
> Since the ./configure script tries to link an object to figure if
> libssh is available, it fails:
>
> $ cat config.log
> [...]
> cc -pthread -I/usr/include/glib-2.0 [...] -o config-temp/qemu-conf.exe
> config-temp/qemu-conf.c -m64 -static -g -lssh
> /usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/libssh.a(dh.c.o):
> In function `ssh_crypto_init':
> (.text+0x1a9): undefined reference to `BN_new'
> (.text+0x1c2): undefined reference to `BN_set_word'
> (.text+0x1c7): undefined reference to `BN_new'
> (.text+0x1e7): undefined reference to `BN_bin2bn'
> (.text+0x1ec): undefined reference to `BN_new'
> (.text+0x20c): undefined reference to `BN_bin2bn'
> (.text+0x218): undefined reference to `OPENSSL_init_crypto'
> [...]
> collect2: error: ld returned 1 exit status
Sigh :/
> ---
> Should we check for libcrypto?
>
> $ pkg-config --libs libssh openssl
> -lssh -lssl -lcrypto
Definitely not! The crypto library is an internal implementation of
libssh, so please do not assume libssh is built against openssl.
--
Pino Toscano
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[Qemu-devel] [PATCH 4/4] configure: Log the libssh version detected, Philippe Mathieu-Daudé, 2019/08/14