Hi Jack,
Pauli, On x86_64-apple-darwin11, building scypy 0.9.0 against python2.7 using the clang compilers and gfortran from FSF gcc 4.6.1, I get the following testsuite results...
I'm a scipy novice, probably hanging out on the wrong list, but I know a little bit about most of the errors you're seeing. There are some differences in calling conventions between Apple's veclib and scipy's expectations which mean that various single-precision functions fail, see here: http://www.macresearch.org/lapackblas-fortran-106 This can be fixed by setting 'export FFLAGS=-ff2c' before running/compiling numpy and scipy (*). For me, this fixed all test_blas failures, using a recent git clone. As far as I can tell, it doesn't introduce other problems (i.e. most tests pass). I tried this with all the standard Lion C compilers, and a couple of different versions of gfortran, with similar results (though llvm has it's own problems (**), and you shouldn't use it). So this is not a question of choosing the right compiler. Ben (*) The results of my experiments are here: http://mail.scipy.org/pipermail/scipy-dev/2011-August/016396.html (**) For instance, ifft(fft(signal)) != signal when using scipy.fftpack