Re: [igraph] Building universal python-igraph on OSX 10.11

[Tamas Nepusz]

> Hello. I tried to build a universal version of python-igraph on OS X El 
> Capitan; it seems that building the C core triggers a clang bug:
Yes, it's likely that this is the same bug:

https://llvm.org/bugs/show_bug.cgi?id=27059

You could try downgrading to an older version of clang if that is an
option for you.

> I’m using brew because pip does not install the C core…
It should try to install the C core if it does not find the C core
already, so maybe you could get around this by removing any installed
version of the C core first. (If "pkg-config --cflags igraph" does not
print anything, you should be okay).

> It looks like building with gcc instead of clang should make it work; 
> unfortunately the —use-gcc option does not seem to have any effect (it still 
> uses clang). Does anybody have a hint ?
Just a hint, but on my machine, gcc is symlinked to clang:

> /usr/bin/gcc -v
Configured with:
--prefix=/Applications/Xcode.app/Contents/Developer/usr
--with-gxx-include-dir=/usr/include/c++/4.2.1
Apple LLVM version 6.0 (clang-600.0.51) (based on LLVM 3.5svn)
Target: x86_64-apple-darwin13.4.0
Thread model: posix

So it could be the case that you don't have a "real" gcc on your
machine. Try installing a homebrewed gcc.

Best,
T.