#20563: Cannot compile SnapPy for sage because sage's gcc is incompatible with
system's as
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Reporter: mgoerner | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-7.2
Component: porting | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/mgoerner/binutils2.24 | afbe56b320454d496e82bf62d1a8efda15aededc
Dependencies: | Stopgaps:
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Comment (by mgoerner):
Replying to [comment:12 jdemeyer]:
> Replying to [comment:11 vbraun]:
> > Not requiring xcode would be nice, though we might also depend on
system headers (don't know).
>
> That's the problem: to actually compile C code, you need a lot more than
just GCC. You need:
> - header files like `stdio.h`
> - standard libraries like `libc`
I think those come with the OS and don't require xcode.
> - an assembler
If you look at the binutils source code, it contains headers nominally
indicating that it supports Mac's native Mach-O files, but the configure
file explicitly disables building the GNU assembler for Mac OS X. I
removed that and compiled a GNU assembler for Mac, but the compilation
failed because gcc on Mac OS X is using some Mach-O feature that xcode's
as supports but not GNU's as.
xcode's as is from cctools http://opensource.apple.com//source/cctools/ or
llvm's own assembler (depending on your xcode version).
> - a linker
I think binutil's ld supports Mach-O even worse than binutil's as.
>
> all these are shipped with XCode but not with GCC. I don't know if it's
even possible to use a complete GNU toolchain on OS X.
The llvm project is developing its own linker, so clang/llvm will
hopefully be a complete cross-platform toolchain in a couple of years.
There is also llvm-gcc, a gcc compiling to llvm's IR so that the rest of
the llvm toolchain can be used.
I have my hopes that clang/llvm will hopefully one day replace the clunky
GNU toolchain.
--
Ticket URL: <http://trac.sagemath.org/ticket/20563#comment:13>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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