［求助］mac下装gdb，制作好了证书，但是运行的时候出现下面的错误是怎么回事？

Question

 (gdb) r
Starting program: /Users/wangxiaoxiao/Desktop/oj/a.out 
warning: `/Users/admin/build/x86_64-apple-darwin15.0.0/libstdc++-v3/src/.libs/compatibility-atomic-c++0x.o': can't open to read symbols: No such file or directory.
warning: `/Users/admin/build/x86_64-apple-darwin15.0.0/libstdc++-v3/src/.libs/compatibility-c++0x.o': can't open to read symbols: No such file or directory.
warning: `/Users/admin/build/x86_64-apple-darwin15.0.0/libstdc++-v3/src/.libs/compatibility-chrono.o': can't open to read symbols: No such file or directory.
warning: `/Users/admin/build/x86_64-apple-darwin15.0.0/libstdc++-v3/src/.libs/compatibility-condvar.o': can't open to read symbols: No such file or directory.
warning: `/Users/admin/build/x86_64-apple-darwin15.0.0/libstdc++-v3/src/.libs/compatibility-debug_list-2.o': can't open to read symbols: No such file or directory.
warning: `/Users/admin/build/x86_64-apple-darwin15.0.0/libstdc++-v3/src/.libs/compatibility-debug_list.o': can't open to read symbols: No such file or directory.
warning: `/Users/admin/build/x86_64-apple-darwin15.0.0/libstdc++-v3/src/.libs/compatibility-thread-c++0x.o': can't open to read symbols: No such file or directory.

gdb不能正常使用，

 (gdb) l
No symbol table is loaded.  Use the "file" command.