[#MDEV-18818] mariadb_config reports wrong name for zlib on Fedora

Comment by Daniël van Eeden [ 2019-03-05 ]

$ cat foo.c

void main() {}

$ gcc foo.c -o foo

$ gcc foo.c -lzlib -o foo

/usr/bin/ld: cannot find -lzlib

collect2: error: ld returned 1 exit status

$ gcc foo.c -lz -o foo

$ ldd foo

	linux-vdso.so.1 (0x00007ffd823ee000)

	libz.so.1 => /lib64/libz.so.1 (0x00007f99af1c4000)

	libc.so.6 => /lib64/libc.so.6 (0x00007f99aeffe000)

	/lib64/ld-linux-x86-64.so.2 (0x00007f99af210000)

Comment by Daniël van Eeden [ 2019-03-05 ]

$ ./bin/mariadb_config

Copyright 2011-2015 MariaDB Corporation AB

Get compiler flags for using the MariaDB Connector/C.

Usage: ./bin/mariadb_config [OPTIONS]

  --cflags        [-I/usr/local/mysql/include/mysql -I/usr/local/mysql/include/mysql/mysql]

  --include       [-I/usr/local/mysql/include/mysql -I/usr/local/mysql/include/mysql/mysql]

  --libs          [-L/usr/local/mysql/lib/ -lmariadb -lzlib -ldl -lm -lpthread -l/usr/local/lib/libgnutls.a]

  --libs_r        [-L/usr/local/mysql/lib/ -lmariadb -lzlib -ldl -lm -lpthread -l/usr/local/lib/libgnutls.a]

  --libs_sys      [-lzlib -ldl -lm -lpthread -l/usr/local/lib/libgnutls.a]

  --version       [10.3.13]

  --cc_version    [3.0.9]

  --socket        [/tmp/mysql.sock]

  --port          [3306]

  --plugindir     [/usr/local/mysql/lib/plugin]

  --tlsinfo       [GnuTLS ]

Comment by Daniël van Eeden [ 2019-03-05 ]

Note that a recent version of Connector/C compiled on the same machine does work just fine:

$ /usr/local/bin/mariadb_config

Copyright 2011-2015 MariaDB Corporation AB

Get compiler flags for using the MariaDB Connector/C.

Usage: /usr/local/bin/mariadb_config [OPTIONS]

  --cflags        [-I/usr/local/include/mariadb -I/usr/local/include/mariadb/mysql]

  --include       [-I/usr/local/include/mariadb -I/usr/local/include/mariadb/mysql]

  --libs          [-L/usr/local/lib/mariadb/ -lmariadb -lz -ldl -lm -lpthread -lssl -lcrypto]

  --libs_r        [-L/usr/local/lib/mariadb/ -lmariadb -lz -ldl -lm -lpthread -lssl -lcrypto]

  --libs_sys      [-lz -ldl -lm -lpthread -lssl -lcrypto]

  --version       [10.3.6]

  --cc_version    [3.1.0]

  --socket        [/tmp/mysql.sock]

  --port          [3306]

  --plugindir     [/usr/local/lib/mariadb/plugin]

  --tlsinfo       [OpenSSL 1.1.1b]

Note the "-lz"

Comment by Georg Richter [ 2020-09-03 ]

After checking https://buildbot.askmonty.org/buildbot/builders/kvm-bintar-centos7-amd64-openssl/builds/1873/steps/compile/logs/stdio it seems that the build uses bundled zlib, sets ZLIB_FOUND and ZLIB_LIBRARY and then builds Connector/C with -DWITH_EXTERNAL_ZLIB=ON which doesn't make sense.

Comment by Georg Richter [ 2020-09-03 ]

Fixed in Connector/C

commit f3ed42f8775d9cba4d2e15551e83b3605a75cc49

Author: Georg Richter <georg@mariadb.com>

Date:   Thu Sep 3 17:34:55 2020 +0200

    Fix for MDEV-18818:

    When C/C is built within server, the server already sets ZLIB_FOUND

    and ZLIB_LIBRARY/INCLUDEDIR. In that case we need to link against the

    ZLIB_LIBRARY but we don't add it to the required system libraries.

[MDEV-18818] mariadb_config reports wrong name for zlib on Fedora Created: 2019-03-05 Updated: 2021-06-29 Resolved: 2020-09-03
Status:	Closed
Project:	MariaDB Server
Component/s:	Compiling, Scripts & Clients
Affects Version/s:	10.3.13
Fix Version/s:	10.2.35, 10.3.26, 10.4.16, 10.5.7