所以我试图在学校的C ++项目中调试段错误。该项目使用makefile进行编译。当我在gdb下运行程序（使用cygwin）时，我得到段错误，但当我尝试使用“l”命令显示代码时，我得到的代码与预期不同，当我使用“frame”时，gdb只打印名称函数的代替而不是上次执行的代码。
Program received signal SIGSEGV, Segmentation fault.
0x000000010041570b in NodeCorrectness::eval(Alignment const&) ()
(gdb) l
1 /* advapi32.cc: Win32 replacement functions.
2
3 This file is part of Cygwin.
4
5 This software is a copyrighted work licensed under the terms of the
6 Cygwin license. Please consult the file "CYGWIN_LICENSE" for
7 details. */
8
9 #include "winsup.h"
10 #include <winioctl.h>
(gdb) frame
#0 0x000000010041570b in NodeCorrectness::eval(Alignment const&) ()
(gdb)
使用backtrace我得到以下内容：
(gdb) bt
#0 0x000000000042781b in NodeCorrectness::eval(Alignment const&) ()
#1 0x0000000000421a2f in MeasureCombination::printMeasures(Alignment const&, std::ostream&) const ()
#2 0x00000000004fbedf in makeReport(Graph const&, Graph&, Alignment const&, MeasureCombination const&, Method*, std::basic_ofstream<char, std::char_traits<char> >&)
()
#3 0x00000000004fe6cd in saveReport(Graph const&, Graph&, Alignment const&, MeasureCombination const&, Method*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >) ()
#4 0x00000000004d06a7 in NormalMode::run(ArgumentParser&) ()
#5 0x000000000040a655 in main ()
(gdb)
所以gdb不让我看到segfault究竟发生在哪里。有什么理由吗？