[Haskell-cafe] Re: Support for lock-free/wait-free programming? / ANN: bits-atomic

On Sun, 29 Aug 2010 13:08:48 -0400, Gregory Collins wrote:

Gregory Collins writes: ...sigh... The "programs link fine without it" part is a partial lie. Anything that the C linker links (i.e. executables) works fine without an explicit -lgcc_s, but ghci and compilations using template haskell fail with an "unknown symbol `___bswapdi2'", or equivalent.

Looking for a workaround now.

After some more off-list discussion with Gregory (thanks for your help!) I split out the atomic operations to the bits-atomic package [1] which no longer depends on libgcc_s. GCC produces native code for atomic operations, so libgcc_s is not needed for these operations. Additionally, a test suite covering the most important operations is now included. I am still looking for a solution to drop the libgcc dependency for Data.Bits.Extras (which will remain in bits-extras) as well, but this is harder as the decision whether to use fall-back software implementations depends on the CPU capabilities. Cheers, Gabriel [1] http://hackage.haskell.org/package/bits-atomic-0.1.0