Linking error on OpenBSD: __builtin_bswap32 not available about cryptohash-sha256 HOT 8 CLOSED

@maximpichler which compiler/version is used on OpenBSD?

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$ ghc --version
The Glorious Glasgow Haskell Compilation System, version 7.10.3

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@maximpichler sorry, I meant the c compiler. This is about the __builtin_bswap32 C compiler primitives missing even though the compiler seems to claim to be GCC-compatible...

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$ gcc --version
gcc (GCC) 4.2.1 20070719 

http://man.openbsd.org/OpenBSD-5.9/man1/gcc-local.1

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Yeah, so GCC 4.3 was when __builtin_bswap32 was added (and also when GCC moved to GPLv3), so we're a bit stuck there (I imagine that's part of the reason OpenBSD has not upgraded - aside from the fact they have their own forked modifications). Sigh.

from cryptohash-sha256.

That's strange... when searching for __builtin_bswap32 you rather find evidence that __builtin_bswap32 was added starting with GCC >= 4.2 rather than >= 4.3:

• https://www.sourceware.org/ml/libc-alpha/2012-04/msg00205.html
• https://cmake.org/Bug/view.php?id=13430

That being said, we can just tighten the version-check to check for >= 4.3 instead and call it a day :-)

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The manuals suggest otherwise: https://gcc.gnu.org/onlinedocs/gcc-4.2.4/gcc/Keyword-Index.html mentions __builtin_bswap32, wheras https://gcc.gnu.org/onlinedocs/gcc-4.3.0/gcc/Keyword-Index.html doesn't.

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Thanks for the swift fix and release!

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