或者我有两个文件,每个文件都有一个全局初始化。一个取决于另一个。跨C++翻译单元初始化
简化的例子:
file1.h:
#include <string>
extern const std::string PREFIX;
file1.cpp:
#include "file1.h"
const std::string PREFIX = "prefix,";
file2.cpp:
#include "file1.h"
std::string MSG = PREFIX + "body";
int main(){}
我编译它们的方式:
/usr/local/bin/g++-4.6.2 -c -Wall -g -o file1.o file1.cpp
/usr/local/bin/g++-4.6.2 -c -Wall -g -o file2.o file2.cpp
/usr/local/bin/g++-4.6.2 -Wall -g -o example file1.o file2.o
当我运行这个,它segfaults。 GDB跟踪:
Starting program: example
Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7b7ae0b in std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::string const&)()
from /usr/local/lib/gcc/x86_64-unknown-linux-gnu/4.6.2/libstdc++.so.6
(gdb) bt
#0 0x00007ffff7b7ae0b in std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::string const&)()
from /usr/local/lib/gcc/x86_64-unknown-linux-gnu/4.6.2/libstdc++.so.6
#1 0x00000000004009b5 in std::operator+<char, std::char_traits<char>, std::allocator<char> > (__lhs=Traceback (most recent call last):
File "/usr/local/lib/gcc/x86_64-unknown-linux-gnu/4.6.2/../../../../share/gcc-4.6.2/python/libstdcxx/v6/printers.py", line 587, in to_string
return ptr.lazy_string (length = len)
RuntimeError: Cannot access memory at address 0xffffffffffffffe8
, __rhs=0x400af0 "body") at /usr/local/lib/gcc/x86_64-unknown-linux-gnu/4.6.2/include/c++/bits/basic_string.h:2346
#2 0x000000000040095f in __static_initialization_and_destruction_0 (__initialize_p=1, __priority=65535) at file2.cpp:3
#3 0x000000000040098b in _GLOBAL__sub_I_MSG() at file2.cpp:6
#4 0x0000000000400ab6 in __do_global_ctors_aux()
#5 0x00000000004006e3 in _init()
#6 0x00007ffff7ffa5a0 in ??()
#7 0x0000000000400a45 in __libc_csu_init()
#8 0x00007ffff72dcbe0 in __libc_start_main() from /lib/libc.so.6
#9 0x00000000004007c9 in _start()
反正有没有做什么,我试图做的(记住,这是一个过于简单的例子)?或者,我是否受编译器/链接器选择的初始化顺序的支配?