Building mariadb-connector-c library as a submodule - cmake

Question

I am trying to build mariadb client library as a submodule by using add_subdirectory(external/mariadb-connector-c) from my project. When I build standalone mariadb client, everything works fine, however this solution means that I have to link pre-built binaries directly. I would like to avoid this kind of two step build process, but when I try to run cmake from my project, I got a lot of errors related to mariadb plugins:
CMake Error at external/mariadb-connector-c/cmake/install_plugins.cmake:11 (INSTALL):
INSTALL TARGETS given no LIBRARY DESTINATION for module target
"client_ed25519".
Call Stack (most recent call first):
external/mariadb-connector-c/cmake/plugins.cmake:82 (INSTALL_PLUGIN)
external/mariadb-connector-c/plugins/auth/CMakeLists.txt:54 (REGISTER_PLUGIN)
external/mariadb-connector-c/plugins/CMakeLists.txt:7 (INCLUDE)
external/mariadb-connector-c/CMakeLists.txt:403 (INCLUDE)
Here, external/mariadb-connector-c is registered as a git submodule inside of my project repository.
Is there any way to embed mariadb client library as a submodule to make it work by running CMake from my root project or do I have to build it as a standalone project?

Answer 1

It does not work for mee too (linux, cmake-3.10)
I have to set at least SET(INSTALL_PLUGIN x) to avoid cmake errors.
Here is my minimal working example:
# file CMakeLists.txt
PROJECT(my_connector_info)
SET(INSTALL_PLUGINDIR ${CMAKE_BINARY_DIR}) # needed by mariadb-connector-c
add_subdirectory(libs/mariadb-connector-c-3.1.10-src EXCLUDE_FROM_ALL)
add_executable(${PROJECT_NAME} my_connector_info.c)
target_link_libraries(${PROJECT_NAME} mariadbclient)
target_include_directories(${PROJECT_NAME} SYSTEM PRIVATE ${CMAKE_SOURCE_DIR}/libs/mariadb-connector-c-3.1.10-src/include)
target_include_directories(${PROJECT_NAME} SYSTEM PRIVATE ${CMAKE_BINARY_DIR}/libs/mariadb-connector-c-3.1.10-src/include)
/* file my_connector_info.c */
#include <stdio.h>
#include <mysql.h>
int main()
{
printf("info: %s\n", mysql_get_client_info());
return 0;
}
Here's how you build it:
#!/bin/sh
set -eux
(
mkdir -p libs
cd libs
test -e mariadb-connector-c-3.1.10-src.tar.gz || wget https://dlm.mariadb.com/1157459/Connectors/c/connector-c-3.1.10/mariadb-connector-c-3.1.10-src.tar.gz
test -d mariadb-connector-c-3.1.10-src || tar -xzf mariadb-connector-c-3.1.10-src.tar.gz
cd -
)
mkdir -p build
cd build
cmake ..
make
./my_connector_info
output of my_connector_info:
info: 10.5.5