--enable-auto-import的目的警告 [英] Purpose of --enable-auto-import Warning

问题描述

我试图编译以下程序：

#include <iostream>
int main(){
    std::cout << "Hello, world!";
    return 0;
}

当我编译它，我收到这个消息：

When I compile it, I get this message:

C:\programs>g++ test.cpp
Info: resolving std::cout  by linking to __imp___ZSt4cout (auto-import)
c:/mingw/bin/../lib/gcc/mingw32/4.5.0/../../../../mingw32/bin/ld.exe: warning: a
uto-importing has been activated without --enable-auto-import specified on the c
ommand line.
This should work unless it involves constant data structures referencing symbols
 from auto-imported DLLs.

构建成功，可执行文件按预期运行，但此警告仍然令我恼火。我期望一个成功的建设完全沉默。

The build succeeds and the executable runs as expected, but this warning still irritates me. I expect a successful build to be completely silent. This message gives the false impression that there's something wrong with my code.

我可以使用 g ++ -Xlinker --enable-auto- import test.cpp ，但是这是不可取的，因为它需要编译一个程序需要输入的字符数量的三倍。

I can silence this error with g++ -Xlinker --enable-auto-import test.cpp, but this is undesirable, as it triples the number of characters I need to type to compile a program.

问题：

• 为什么最简单的程序会出现此警告？我不会在编译Hello World时看到隐藏的警告。


• 是否可以在不将标志传递给链接器的情况下静默此警告？在 c：\mingw 中隐藏的配置文件中的一个选项，也许？或者在安装期间可能错过了自动启用自动导入复选框？

• Why does this warning appear for the simplest of programs? i don't expect cryptic warnings when I compile Hello World.
• Is it possible to silence this warning without passing the flag to the linker every time? An option in a config file hidden somewhere in c:\mingw, perhaps? Or maybe I missed an "automatically enable auto-import" checkbox during installation?

可能相关规格

Possibly Relevant Specs

• GCC版本4.5.0


• ld.exe版本2.20.51.20100613


• Windows XP Service Pack 3

推荐答案

像它可能与没有定义dllimport属性的mingw32 dll相关。

I did some reading and it looks like it might be related to the mingw32 dll not having dllimport attributes defined.

也许有补丁或你可以自己重建mingw32并添加它们？

Perhaps there is a patch or you can rebuild mingw32 yourself and add them?

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