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[英]Why is _GNU_SOURCE macro required for pthread_mutexattr_settype() while it is in POSIX/IEEE standard?
[英]Why am I getting undefined reference to pthread_mutexattr_settype?
我正在嘗試編譯和鏈接Novell LDAP C SDK中的示例文件,但由於pthread
庫中有3個未解析的符號,鏈接失敗。 我在Ubuntu 13.10(Saucy)上使用gcc 4.8.1。 我已將pthread
庫正確地包含在命令行中的最后一個庫中,但這些特定符號仍未解析。
$ 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<br>
../lib/libldapsdk.so: reference to pthread_mutexattr_init<br>
../lib/libldapsdk.so: reference to pthread_mutex_trylock<br>
/lib/i386-linux-gnu/libpthread.so.0: definition of pthread_mutexattr_settype<br>
/lib/i386-linux-gnu/libpthread.so.0: definition of pthread_mutexattr_init<br>
/lib/i386-linux-gnu/libpthread.so.0: definition of pthread_mutex_trylock<br>
../lib/libldapsdk.so: undefined reference to pthread_mutexattr_settype<br>
../lib/libldapsdk.so: undefined reference to pthread_mutex_trylock<br>
../lib/libldapsdk.so: undefined reference to pthread_mutexattr_init<br>
collect2: error: ld returned 1 exit status
$ readelf --all /lib/i386-linux-gnu/libpthread.so.0|grep pthread_mutexattr_settype<br>
114: 00009d90 36 FUNC GLOBAL DEFAULT 13 pthread_mutexattr_settype@@GLIBC_2.1<br>
493: 00009d90 36 FUNC GLOBAL DEFAULT 13 pthread_mutexattr_settype
在cmake中你可以添加set( CMAKE_CXX_FLAGS " -pthread " )
不要編輯間距!
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