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After hanging long time with older Ubuntu (v.12) I'm updating to v.16 and am very confused with mentions of "gcc-multilib".

Is this actually Apple's "fat binaries" or "universal binaries" model ported to Linux?

That is, have native C libraries on Ubuntu become containers that pack several binaries for various architectures?

If so, we no longer have to specially install 32-bit runtime libs on a x64 system? The "default" package of gcc or g++ libraries contains all needed to run and build 32-bit apps?

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gcc-multilib is useful for cross-compiling, that is, compiling a program to run on a different processor architecture. For example, you would need gcc-multilib if you are running on 64-bit Ubuntu and want to compile a program to run on 32-bit Ubuntu (or on ARM etc. you get the idea).

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    So, it is not related to runtime libraries? Do we still need to go thru the hoops and install "libc-i386", "g++-i386" and so on 32-bit libs to run 32-bit programs on x64? And is "dpkg --add-architecture i386" related to multilib ? – ddbug Dec 1 '16 at 23:28
  • Yes. The usual hoops. dpkg --add-architecture simply tells dpkg that you really want to install packages for foreign architecture and it should stop complaining and requesting --force-architecture. – AlexP Dec 1 '16 at 23:35
  • Thank you AlexP. Is this multilib setup new for Ubuntu 16, or it existed earlier, say in v.14 or even 12? – ddbug Dec 1 '16 at 23:45
  • 12.04 at least. – AlexP Dec 1 '16 at 23:49

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