编译Mongo c驱动程序示例程序

Question

我开始学习如何使用mongo-c-driver，但我在运行时遇到了编译问题

gcc -g -Wall -Werror -Isrc --std=c99 mongo-c-driver/src/*.c -I mongo-c-driver/src/ intro.c -lmongoc 

我已经看过另一个stackoverflow帖子了，在这里找到了cannot compile mongo-c-driver example，它没有帮助。以下是我的编译器的输出

mongo-c-driver/src/bcon.c:37:12: error: ‘bcon_error’ defined but not used [-Werror=unused-function]
mongo-c-driver/src/bcon.c:378:13: error: ‘bcon_json_print’ defined but not used [-Werror=unused-function]
cc1: all warnings being treated as errors
mongo-c-driver/src/env.c: In function ‘mongo_env_socket_connect’:
mongo-c-driver/src/env.c:319:21: error: storage size of ‘ai_hints’ isn’t known
mongo-c-driver/src/env.c:340:5: error: implicit declaration of function ‘getaddrinfo’ [-Werror=implicit-function-declaration]
mongo-c-driver/src/env.c:342:9: error: implicit declaration of function ‘gai_strerror’ [-Werror=implicit-function-declaration]
mongo-c-driver/src/env.c:347:60: error: dereferencing pointer to incomplete type
mongo-c-driver/src/env.c:348:36: error: dereferencing pointer to incomplete type
mongo-c-driver/src/env.c:348:55: error: dereferencing pointer to incomplete type
mongo-c-driver/src/env.c:348:76: error: dereferencing pointer to incomplete type
mongo-c-driver/src/env.c:354:45: error: dereferencing pointer to incomplete type
mongo-c-driver/src/env.c:354:62: error: dereferencing pointer to incomplete type
mongo-c-driver/src/env.c:368:20: error: dereferencing pointer to incomplete type
mongo-c-driver/src/env.c:381:5: error: implicit declaration of function ‘freeaddrinfo’ [-Werror=implicit-function-declaration]
mongo-c-driver/src/env.c:319:21: error: unused variable ‘ai_hints’ [-Werror=unused-variable]
cc1: all warnings being treated as errors
intro.c: In function ‘main’:
intro.c:9:7: error: enumeration value ‘MONGO_CONN_SUCCESS’ not handled in switch [-Werror=switch]
intro.c:9:7: error: enumeration value ‘MONGO_CONN_ADDR_FAIL’ not handled in switch [-Werror=switch]
intro.c:9:7: error: enumeration value ‘MONGO_CONN_BAD_SET_NAME’ not handled in switch [-Werror=switch]
intro.c:9:7: error: enumeration value ‘MONGO_CONN_NO_PRIMARY’ not handled in switch [-Werror=switch]
intro.c:9:7: error: enumeration value ‘MONGO_IO_ERROR’ not handled in switch [-Werror=switch]
intro.c:9:7: error: enumeration value ‘MONGO_SOCKET_ERROR’ not handled in switch [-Werror=switch]
intro.c:9:7: error: enumeration value ‘MONGO_READ_SIZE_ERROR’ not handled in switch [-Werror=switch]
intro.c:9:7: error: enumeration value ‘MONGO_COMMAND_FAILED’ not handled in switch [-Werror=switch]
intro.c:9:7: error: enumeration value ‘MONGO_WRITE_ERROR’ not handled in switch [-Werror=switch]
intro.c:9:7: error: enumeration value ‘MONGO_NS_INVALID’ not handled in switch [-Werror=switch]
intro.c:9:7: error: enumeration value ‘MONGO_BSON_INVALID’ not handled in switch [-Werror=switch]
intro.c:9:7: error: enumeration value ‘MONGO_BSON_NOT_FINISHED’ not handled in switch [-Werror=switch]
intro.c:9:7: error: enumeration value ‘MONGO_BSON_TOO_LARGE’ not handled in switch [-Werror=switch]
intro.c:9:7: error: enumeration value ‘MONGO_WRITE_CONCERN_INVALID’ not handled in switch [-Werror=switch]
cc1: all warnings being treated as errors

更新

另外，如果我决定参选

gcc --std=c99 -Wall intro.c -lmongoc

我的程序可以编译，但会给出错误

$ ./a.out 
./a.out: error while loading shared libraries: libmongoc.so.0.7: cannot open shared object file: No such file or directory

Answer 1

解决这个问题的另一种方法，至少在fedora 18中，是运行以下命令

su -c "echo /usr/local/lib > /etc/ld.so.conf.d/mongoc.conf"
su -c "ldconfig"

正确链接来自mongo-c-driver的库。

Answer 2

我不知道为什么这个示例不能编译，但是如果我复制src目录并创建一个lib目录，那么我可以使用

gcc --std=c99 -o test_program -Llib/ -Isrc/ test.c lib/libmongoc.a

其中的目录设置如下

--test.c
--lib
|---libbson.a
|---libbson.so
|---libmongoc.a
|---libmongoc.so
--src
|---bcon.h
|---bon.c
|---env.c
|---env.h
|---etc.