[英]addr2line get line number always return 0
我使用以下代码来获取回溯
void print_backtrace(void) {
static const char start[] = "BACKTRACE ------------\n";
static const char end[] = "----------------------\n";
void *bt[1024];
int bt_size;
char **bt_syms;
int i;
bt_size = backtrace(bt, 1024);
bt_syms = backtrace_symbols(bt, bt_size);
for (i = 1; i < bt_size; i++) {
size_t len = strlen(bt_syms[i]);
std::cout << bt_syms[i] << std::endl;
}
free(bt_syms);
}
int main() {
print_backtrace();
return 0;
}
输出是:
/home/roroco/Dropbox/c/ro-c/cmake-build-debug/ex/test_backtrace_with_line_number
/home/roroco/Dropbox/c/ro-c/cmake-build-debug/ex/test_backtrace_with_line_number(main+0x9) [0x400d0b]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0) [0x7ff20985c830]
/home/roroco/Dropbox/c/ro-c/cmake-build-debug/ex/test_backtrace_with_line_number(_start+0x29) [0x400b29]
当我使用 addr2line 将 addr 转换为行号时,返回总是“??:0”,如何获得真实的行号?
roroco@roroco ~/Dropbox/c/ro-c $ addr2line -e /home/roroco/Dropbox/c/ro-c/cmake-build-debug/CMakeFiles/3.12.0/CompilerIdCXX/a.out 0x400d0b
??:0
roroco@roroco ~/Dropbox/c/ro-c $ addr2line -e /home/roroco/Dropbox/c/ro-c/cmake-build-debug/CMakeFiles/3.12.0/CompilerIdCXX/a.out 0x7ff20985c830
??:0
roroco@roroco ~/Dropbox/c/ro-c $ addr2line -e /home/roroco/Dropbox/c/ro-c/cmake-build-debug/CMakeFiles/3.12.0/CompilerIdCXX/a.out 0x400b29
??:0
事实证明
/home/roroco/Dropbox/c/ro-c/cmake-build-debug/CMakeFiles/3.12.0/CompilerIdCXX/a.out
不是您构建的可执行文件(它对应于 CMake 完成的编译器测试)。
相反,您可以尝试以下操作:
addr2line -e /home/roroco/Dropbox/c/ro-c/cmake-build-debug/ex/test_backtrace_with_line_number
其中test_backtrace_with_line_number
对应于您构建的可执行文件。 它应该是与CMakeLists.txt
的add_executable
命令关联的名称
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