Which lib to use? libmariadbclient or libmysqlclient?

Question

For some unknown reason, my libmysqlclient.a disappeared in my CentOS 7. My program then got linker error, saying cannot find libmysqlclient.

And then I discovered t

Answer 1

I had the similar problem when tried to compile my program with "-lmariadbclient" (after apt-get update -lmysqlclient stopped working). The Makefile I used was:

g++ -std=c++11 *.cpp ../common/*.cpp ../common/*.c -o myprogram -I.. -ldl -Wstack-protector -fstack-protector-all -pthread -ggdb -lssl -lcrypto -lz -lmariadbclient -Wwrite-strings  -fPIC 

I read that commands "-lssl -lcrypto -lz" must be added to fix those errors, but I put them in the wrong place (before lmariadbclient). When I added them after "-lmariadbclient" I was finally able to compile my program:

g++ -std=c++11 *.cpp ../common/*.cpp ../common/*.c -o myprogram -I.. -ldl -Wstack-protector -fstack-protector-all -pthread -ggdb -lmariadbclient -Wwrite-strings -lssl -lcrypto -lz -fPIC 

UPDATE 22.07.2017:

I recently tried to compile my program on the new Linux Mint 18.2. Unfortunately I was getting the same compilation errors, and I was unable to fix it with the old method:

MariaDB version:

 mysql --version
 mysql  Ver 15.1 Distrib 10.2.7-MariaDB, for debian-linux-gnu (x86_64) using readline 5.2

Compile errors:

/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/libmariadbclient.a(openssl.c.o): In function `ma_tls_start':
(.text+0x189): undefined reference to `CRYPTO_num_locks'
/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/libmariadbclient.a(openssl.c.o): In function `ma_tls_start':
(.text+0x1a4): undefined reference to `CRYPTO_THREADID_set_callback'
/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/libmariadbclient.a(openssl.c.o): In function `ma_tls_start':
(.text+0x1b0): undefined reference to `CRYPTO_set_locking_callback'
/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/libmariadbclient.a(openssl.c.o): In function `ma_tls_start':
(.text+0x1b5): undefined reference to `SSL_library_init'
/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/libmariadbclient.a(openssl.c.o): In function `ma_tls_start':
(.text+0x1c1): undefined reference to `SSL_load_error_strings'
/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/libmariadbclient.a(openssl.c.o): In function `ma_tls_start':
(.text+0x1c6): undefined reference to `OPENSSL_add_all_algorithms_noconf'
/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/libmariadbclient.a(openssl.c.o): In function `ma_tls_end':
(.text+0x2a4): undefined reference to `CRYPTO_set_locking_callback'
/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/libmariadbclient.a(openssl.c.o): In function `ma_tls_end':
(.text+0x2ab): undefined reference to `CRYPTO_set_id_callback'
/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/libmariadbclient.a(openssl.c.o): In function `ma_tls_end':
(.text+0x2cf): undefined reference to `CRYPTO_num_locks'
/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/libmariadbclient.a(openssl.c.o): In function `ma_tls_end':
(.text+0x330): undefined reference to `EVP_cleanup'
/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/libmariadbclient.a(openssl.c.o): In function `ma_tls_end':
(.text+0x335): undefined reference to `CRYPTO_cleanup_all_ex_data'
/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/libmariadbclient.a(openssl.c.o): In function `ma_tls_end':
(.text+0x33a): undefined reference to `ERR_free_strings'
/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/libmariadbclient.a(openssl.c.o): In function `ma_tls_end':
(.text+0x33f): undefined reference to `CONF_modules_free'
/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/libmariadbclient.a(openssl.c.o): In function `ma_tls_init':
(.text+0x3c1): undefined reference to `SSLv23_client_method'
/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/libmariadbclient.a(openssl.c.o): In function `my_cb_threadid':
(.text+0x1e): undefined reference to `CRYPTO_THREADID_set_numeric'

I managed to fix it by changing "-lmariadbclient" to: "-lmariadb". After that I was able to compile my program with no errors. I'm not sure if this solution will work for everyone, but worth to try :)

My final Makefile is:

g++ -std=c++11 *.cpp ../common/*.cpp ../common/*.c -o myprogram -I.. -ldl -Wstack-protector -fstack-protector-all -pthread -ggdb -lmariadb -Wwrite-strings -lssl -lcrypto -lz -fPIC 

Good luck!