[PPL-devel] Configure error when building on Core 2 Duo CPU

[Frank Murphy]

Hi,

   I had a problem trying to build PPL with Homebrew on Mac OS X with a 
Core 2 Duo CPU. I filed a bug with Homebrew here (along with all the 
output from configure):

https://github.com/mxcl/homebrew/issues/17917

   The problem is that the `uname -m` command on this CPU returns the 
string "i386", but the cc compiler from Xcode 4.6 on Mac OS X doesn't 
accept the argument "-march=i386". Configure tries to do this:

configure:6759: cc -c  -g -O3 -fomit-frame-pointer -march=i386 
conftest.c >&5
error: unknown target CPU 'i386'
configure:6759: $? = 1

   The result is confusing because configure ends up complaining about 
not finding the GMP library version 4.1.3 or above.

   I was able to work around this problem for me by adding 
"--enable-arch=core2" to the ./configure line, but that's not an ideal 
solution.

Thanks for looking at this,
Frank