无法链接到静态mysqlclient库，尽管共享库可以工作

Question

我有一个示例程序来熟悉mysqlclient API。但是，当我静态地将其编译并链接到mysqlclient库（.a文件）时，链接器会抱怨它找不到文件，尽管它存在于我的路径中。链接到共享库（在Mac上为.dylib文件）有效。请帮助我解决这个问题。非常感谢！

这是我的驱动程序client.c，它调用mysqlclient库。

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include <mysql.h>

int main(int argc, char **argv) 
{
  MYSQL *mysql = NULL;

  if (mysql_library_init(argc, argv, NULL)) {
    fprintf(stderr, "could not initialize MySQL client library\n");
    exit(1);
  }

  mysql = mysql_init(mysql);

  if (!mysql) {
    puts("Init faild, out of memory?");
    return EXIT_FAILURE;
  }

  if (!mysql_real_connect(mysql,       /* MYSQL structure to use */
              NULL,         /* server hostname or IP address */ 
              NULL,         /* mysql user */
              NULL,          /* password */
              NULL,               /* default database to use, NULL for none */
              0,           /* port number, 0 for default */
              NULL,        /* socket file or named pipe name */
              CLIENT_FOUND_ROWS /* connection flags */ )) {
    puts("Connect failed\n");
  } else {                
    const char *query = "SELECT VERSION()";
    if (mysql_real_query(mysql, query, strlen(query))) {
      printf("Query failed: %s\n", mysql_error(mysql));
    } else {
      puts("Query OK");
    }
  }

  mysql_close(mysql);

  mysql_library_end();

  return EXIT_SUCCESS;
}

这是我的编译方式

gcc -I /usr/local/Cellar/mysql/8.0.16/include/mysql client.c -L /usr/local/Cellar/mysql/8.0.16/lib/ -l mysqlclient.a
ld: library not found for -lmysqlclient.a
clang: error: linker command failed with exit code 1 (use -v to see invocation)

没有.a的编译成功，因为它链接到共享库，而不是静态库。

最后，这是我的库文件：

ls /usr/local/Cellar/mysql/8.0.16/lib/libmysqlclient*
/usr/local/Cellar/mysql/8.0.16/lib/libmysqlclient.21.dylib /usr/local/Cellar/mysql/8.0.16/lib/libmysqlclient.a        /usr/local/Cellar/mysql/8.0.16/lib/libmysqlclient.dylib

Answer 1

-l mysqlclient.a

使链接程序查找名为libmysqlclient.a.a的文件。相反，您需要类似：

gcc -I /usr/local/Cellar/mysql/8.0.16/include/mysql client.c /usr/local/Cellar/mysql/8.0.16/lib/mysqlclient.a