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I've just upgraded one of my Gentoo systems from 32-bit to 64-bit. Now, I need to find any residual 32-bit binaries (mostly user-installed) so I can either re-compile them as 64-bit or install the 32-bit libraries they need. How do I do that?

A minor complication: this system is a fileserver and provides netboot services for ARM and 32-bit x86 systems, so there are both non-native binaries and binaries that are expected to be 32-bit, and I need to exclude the places where those are found from the search.

  • Do you want to search through all files or just files in some directories (like ones in your PATH) ? Have you tried the "file" command? it would tell you things like: ELF 64-bit or ELF 32-bit as well as machine type. If you use a wild card, you might use something like: "file -- *|grep 32-bit"...? – Astara Sep 3 '17 at 21:04
  • All files except the ones where 32-bit binaries are expected (ie. everything except a few specific subtrees). The upgrade process took care of pretty much everything in PATH. – Mark Sep 3 '17 at 21:40
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You can do

find / -type f -executable -exec file {} \; | grep 32-bit

to find all the 32-bit executables on your system. (You might not want to start at /)

Then just use sed to filter out the directories where you are expecting 32-bit binaries

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