问题描述
我安装cygwin与gcc 4.8.3（编译c ++）。一切都很好，直到我决定构建一个32位可执行文件：编译错误出现时，我编译代码 #include< cstdlib> 我使用 stdlib.h 而不是 cstdlib ）。
I installed cygwin with gcc 4.8.3 (to compile c++). All was well until I decided to build a 32-bit executable: a compilation error appeared when I compiled the code #include <cstdlib> (the error doesn't appear if I use stdlib.h instead of cstdlib).
经过一些挖掘，我找到了以下文件：
After some digging, I found the following file:
在该文件中， p>
In that file, I have:
/* Define if __int128 is supported on this host. */
#define _GLIBCXX_USE_INT128 1
如果我删除此代码，编译错误将消失。
If I remove this code, the compilation error disappears.
这是调整我的gcc配置的正确方法吗？ （我几乎可以肯定不是）
Is this the right way to tune my gcc configuration? (I am almost sure it isn't)
如果没有，我应该怎么办？
If not, how should I do it?
为了参考，这里是我在说的编译错误：
For reference, here is the compilation error I was talking about:
$ echo '#include <cstdlib>' | g++ -c -m32 -x c++ -
In file included from <stdin>:1:0:
/usr/lib/gcc/x86_64-pc-cygwin/4.8.3/include/c++/cstdlib:178:10: error: expected unqualified-id before ‘__int128’
inline __int128
^
推荐答案
从下载tarball。并遵循INSTALL指令。
Download the tarball from one of GCC mirror sites. And follow the INSTALL instructions. It's very straightforward, just did it again for 4.9.1.
对于你的问题，你在 a 32位机？无需黑客源代码。您是否正确运行 ./ configure ？您的机器是否支持128位 int ？ 可能是 ./ configure 的参数，以指定是或否。
For your problem, are you on a 32bit machine? There's no need to hack the source code. Have you run ./configure properly? Does your machine support 128bit int? There probably be a parameter to ./configure to state this yes or no.
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