GNU
解決"undefined reference to mq_timedreceive"問題
參考資訊：
1. message-queue-makefile-error-undefined-reference-to-mq-open
問題如下：
LINK i386-linux-user/qemu-i386 syscall.o: In function `do_syscall': qemu/linux-user/syscall.c:7841: undefined reference to `mq_timedreceive' qemu/linux-user/syscall.c:7866: undefined reference to `mq_setattr' qemu/linux-user/syscall.c:7813: undefined reference to `mq_unlink' qemu/linux-user/syscall.c:7824: undefined reference to `mq_timedsend' syscall.o: In function `mq_open': /usr/include/x86_64-linux-gnu/bits/mqueue2.h:56: undefined reference to `mq_open' syscall.o: In function `do_syscall': qemu/linux-user/syscall.c:7845: undefined reference to `mq_receive' qemu/linux-user/syscall.c:7828: undefined reference to `mq_send' qemu/linux-user/syscall.c:7861: undefined reference to `mq_getattr' collect2: error: ld returned 1 exit status Makefile:398: recipe for target 'qemu-i386' failed make[1]: *** [qemu-i386] Error 1 Makefile:84: recipe for target 'subdir-i386-linux-user' failed make: *** [subdir-i386-linux-user] Error 2
解法如下：
LIBS+= -lrt