On Fri, 16 Aug 2013, a...@gratin.org wrote:

I have a difficult bug.

Not really. This kind of thing crops up pretty regularly when trying to produce portable binaries.

We have a suspicion on the SSE4.2 instruction set, as it seems that this instruction set is not present on the machines on which it fails

For portability, you'll need to generate code for some least-common-denominator architecture.

Take a look at the -mtune and -march options in the GCC documentation, as well as the "-mmmx" family of options. Also, look at "configure --help" for glib (and other libraries you intend to distribute) for any --enable options that relate to architecture-specific instructions.

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