我正在尝试编译和链接Novell LDAP C SDK中的示例文件,但由于pthread
库中有3个未解析的符号,链接失败.我在Ubuntu 13.10(Saucy)上使用gcc 4.8.1.我已将pthread
库正确地包含在命令行中的最后一个库中,但这些特定符号仍未解析.
$ gcc -Wl,-trace-symbol=pthread_mutexattr_settype -Wl,-trace-symbol=pthread_mutexattr_init -Wl,-trace-symbol=pthread_mutex_trylock -o search search.o -L../lib -lldapsdk -lpthread ../lib/libldapsdk.so: reference to pthread_mutexattr_settype
../lib/libldapsdk.so: reference to pthread_mutexattr_init
../lib/libldapsdk.so: reference to pthread_mutex_trylock
/lib/i386-linux-gnu/libpthread.so.0: definition of pthread_mutexattr_settype
/lib/i386-linux-gnu/libpthread.so.0: definition of pthread_mutexattr_init
/lib/i386-linux-gnu/libpthread.so.0: definition of pthread_mutex_trylock
../lib/libldapsdk.so: undefined reference to pthread_mutexattr_settype
../lib/libldapsdk.so: undefined reference to pthread_mutex_trylock
../lib/libldapsdk.so: undefined reference to pthread_mutexattr_init
collect2: error: ld returned 1 exit status $ readelf --all /lib/i386-linux-gnu/libpthread.so.0|grep pthread_mutexattr_settype
114: 00009d90 36 FUNC GLOBAL DEFAULT 13 pthread_mutexattr_settype@@GLIBC_2.1
493: 00009d90 36 FUNC GLOBAL DEFAULT 13 pthread_mutexattr_settype
Ali.. 23
只需将评论作为答案撰写,因为根据其他用户的反馈证明它是有用的.
请传递-pthread
给编译器(不带-l
).另请参阅gcc - 编译时-pthread标志的重要性.