我可以使用 Macports 编译通用代码吗？海湾合作委员会？
由于 Apple 不支持 GCC 4.6 或 GCC 4.7，我只是切换到 MacPorts 的 GCC 4.6/4.7 版本。但是，我在“通用”架构中构建代码时遇到了问题。
传统上，我会执行 g++ -arch i386 -arch x86_64 ... 来编译至少适用于 i386/x86_64 架构的二进制文件。我做了一些搜索，并意识到 -arch 选项仅受苹果编译器支持。所以当然它不适用于Macports。我能做的最好的事情就是使用 -m32/-m64 选项来指定我想要的架构。但是，这只会生成 i386 或 x86_64 格式的二进制文件。我真正想要的是在两种架构（通用）中获得一个二进制文件，就像原始 GCC 编译器所做的那样。
这是不受支持还是已知问题？我整晚都在谷歌上寻找答案，但没有得到任何有用的东西。所以我开始怀疑我是否是唯一一个遇到这个问题的人，并且我错过了一些使其发挥作用的真正重要的东西？如果有人能给我一些建议，我真的很感激。
顺便提一句。我已经安装了 gcc46 +universal 变体，但除了为每个体系结构编译单独的二进制文件之外，它没有产生任何真正通用的东西。
兴。
Since Apple do not support GCC 4.6 or GCC 4.7, I just switched to MacPorts' build of GCC 4.6/4.7. However, I had a problem to build my code in "Universal" architecture.
Traditionally, I'd do g++ -arch i386 -arch x86_64 ... to compile my binary for at least i386/x86_64 architecture. I did some search, and realised that -arch option is only supported by apple's compilers. So of course it didn't work with the Macports'. The best I could do is use -m32/-m64 options to specify an architecture I want. However, this will only produce a binary eitherr in i386 or x86_64 format. What I really want is get a binary file in both architecture (Universal) just as been done with the original GCC compilers.
Is this not supported or a known problem? I have tried the whole night looking for answers on Google, but I haven't get anything useful. So I just start doubt if I am the only one had this problem and I have missed something really important to get it work? Really appreciate if anyone can give me some suggestions.
BTW. I have installed gcc46 +universal variants, but it didn't produce anything really universal except compiling separate binaries for each architecture.
Xing.
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哦，我刚刚遇到了这个问题，并花了相当多的时间来解决它。事实证明，GCC 4.2.1 的苹果版本实际上只是一个包装器，它遵循一些标志（特别是 -arch 标志），然后使用 lipo 将对象文件重新组合成一个胖对象。我稍微修改了这个驱动程序，以便它可以包装 macports GCC，同时仍然遵循 -arch 标志并生成多 arch 对象文件（无论如何，对于 32 位和 64 位 intel）。
我刚刚发布了一篇关于如何执行此操作的相当广泛的文章：
http://thecoderslife.blogspot.com/2015/07/building-with-gcc-46-and-xcode-4.html
Oh, I just had this problem and spent a pretty extensive amount of time on it. It turns out that the apple version of GCC 4.2.1 is really just a wrapper that honors a few flags (notably the -arch flag) and then uses lipo to stick the object files back together into a fat object. I modified this driver a bit so that it would wrap macports GCC while still honoring the -arch flag and produce multi arch object files (for 32 bit and 64 bit intel anyway).
I just posted a fairly extensive write up on how to do this:
http://thecoderslife.blogspot.com/2015/07/building-with-gcc-46-and-xcode-4.html
您可以使用 lipo。
You can combine binaries with different architectures in to a single universal using lipo.