gdb调试任何C语言代码都报错：not in executable format: File format not recognized
GNU gdb (GDB) Red Hat Enterprise Linux (7.2-90.el6)
Copyright (C) 2010 Free Software Foundation, Inc.
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(gdb) file ./main.cc
"/backup/workspace/mysql-5.7.25/sql/main.cc": not in executable format: File format not recognized