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我試圖在gdb中使用調試符號運行Debian 7.7.0附帶的exim4郵件服務器。我已經使用apt-get install exim4-dbg安裝了調試符號，它們似乎位於/ usr/lib/debug中。當我嘗試連接到進出口過程中，我得到如下：（沒有找到調試符號）如何配置gdb來加載符號？
Attaching to process 25318
Reading symbols from /usr/sbin/exim4...(no debugging symbols found)...done.
Reading symbols from /lib/i386-linux-gnu/i686/cmov/libresolv.so.2...(no debugging symbols found)...done.
Reading symbols from /lib/i386-linux-gnu/i686/cmov/libnsl.so.1...(no debugging symbols found)...done.
Reading symbols from /lib/i386-linux-gnu/i686/cmov/libcrypt.so.1...(no debugging symbols found)...done.
Reading symbols from /lib/i386-linux-gnu/i686/cmov/libm.so.6...(no debugging symbols found)...done.
Reading symbols from /lib/i386-linux-gnu/i686/cmov/libdl.so.2...(no debugging symbols found)...done.
Reading symbols from /usr/lib/i386-linux-gnu/libdb-5.1.so...(no debugging symbols found)...done.
Reading symbols from /usr/lib/i386-linux-gnu/libgnutls.so.26...(no debugging symbols found)...done.
Reading symbols from /lib/i386-linux-gnu/libpcre.so.3...(no debugging symbols found)...done.
Reading symbols from /lib/i386-linux-gnu/i686/cmov/libc.so.6...(no debugging symbols found)...done.
Reading symbols from /lib/ld-linux.so.2...(no debugging symbols found)...done.
Reading symbols from /lib/i386-linux-gnu/i686/cmov/libpthread.so.0...(no debugging symbols found)...done.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/i386-linux-gnu/i686/cmov/libthread_db.so.1".
Reading symbols from /usr/lib/i386-linux-gnu/libtasn1.so.3...(no debugging symbols found)...done.
Reading symbols from /lib/i386-linux-gnu/libgcrypt.so.11...(no debugging symbols found)...done.
Reading symbols from /lib/i386-linux-gnu/libz.so.1...(no debugging symbols found)...done.
Reading symbols from /usr/lib/i386-linux-gnu/libp11-kit.so.0...(no debugging symbols found)...done.
Reading symbols from /lib/i386-linux-gnu/libgpg-error.so.0...(no debugging symbols found)...done.
Reading symbols from /lib/i386-linux-gnu/i686/cmov/libnss_compat.so.2...(no debugging symbols found)...done.
Reading symbols from /lib/i386-linux-gnu/i686/cmov/libnss_nis.so.2...(no debugging symbols found)...done.
Reading symbols from /lib/i386-linux-gnu/i686/cmov/libnss_files.so.2...(no debugging symbols found)...done.
Reading symbols from /lib/libnss_mdns4_minimal.so.2...(no debugging symbols found)...done.
Reading symbols from /lib/i386-linux-gnu/i686/cmov/libnss_dns.so.2...(no debugging symbols found)...done.
Reading symbols from /lib/libnss_mdns4.so.2...(no debugging symbols found)...done.
0xb765c424 in __kernel_vsyscall()
(gdb) show debug-file-directory
The directory where separate debug symbols are searched for is "/usr/lib/debug".
(gdb) list
No symbol table is loaded. Use the "file" command.
(gdb)
任何幫助是極大的讚賞。謝謝！