Re: [Haskell-beginners] cmath Install troubles

On 4/18/12, Brandon Allbery wrote:

On Wed, Apr 18, 2012 at 16:18, Tom Murphy wrote:

...

2 important facts: - A test C program, using one of the "undefined" functions (isnan) compiles with GCC and runs - I went in by hand and temporarily replaced each version of math.h on my computer with a version that has the necessary functions defined. Cabal-install still failed with the same error.

This makes it seem like cabal doesn't have access to _any_ math.h file, but if this were the case, wouldn't I get many more undefined-function errors than I do?

Unless you are using an older ghc with -fvia-C, [...] I have 7.0.4.

[...]

is not used or useful. The modern -fasm codegen doesn't know what to do with C-level declarations. If your is using macros to define gamma as something else, you will need to find that something else or use a wrapper library.

Hmm, that's true... I don't really understand how .hsc files are compiled, but isn't the "#include " in cmath done in the very standard FFI style?

I note that OS X doesn't have a gamma(). There are lgamma() and tgamma() and variations thereon. (and no related macros in , confirming that it is not related.)

What do you mean by OS X not having them? On my system (10.6), gamma() is defined (at least in math.h (well, at least the ones in /usr/include/architecture/i386/ and /Developer/SDKs/MacOSX10.6.sdk/usr/include/architecture/i386/)) Thanks for your help. Tom