Consider not upgrading to Xcode 9.0

[John H Palmieri]

I just upgraded an OS X box to Xcode 9.0, and now Sage doesn't build:

- with a fresh Sage 8.1.beta5 tarball, gcc doesn't build:

/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/functional:1398:2: error: no member named 'fancy_abort' in namespace 'std::__1'; did you mean simply 'fancy_abort'?
        _VSTD::abort();
        ^~~~~~~

I'll open a ticket and post the full gcc log.

- instead using trac 12426 (compile with clang instead of gcc), eclib doesn't build:

/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/cmath:572:12: error: call to function 'isnan' that is neither visible in the template definition nor found by argument-dependent lookup
    return isnan(__lcpp_x);

....

/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/cmath:592:12: error: call to function 'isinf' that is neither visible in the template definition nor found by argument-dependent lookup
    return isinf(__lcpp_x);

--
John

[Dima Pasechnik]

The eclib does not look like a big problem, some rather standard C++ template issue to be tweaked...

[John H Palmieri]

I put the log for that failure at #12426, and then François created an upstream ticket at

   https://github.com/JohnCremona/eclib/issues/28

in case you want to take a look.

[François Bissey]

We in fact have a patch on github for a similar problem that was spotted
before. It proved effective in this instance. So I will proceed with trying
to build the rest of sage.

François

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[François Bissey]

So I have a build of sage 8.1.beta5 on OS X with Xcode 9 using

* #12426 - building with clang - you need autotools installed or generate configure
somewhere that does and copy it in place.

* an external fortran compiler, given the problems with gcc it may
very well be that gfortran won’t build either - I need to further check that.

* an updated eclib https://github.com/JohnCremona/eclib/archive/v20170815.tar.gz
probably not necessary but defaulting to C++11 make logs much nicer since
it cuts down on the warnings. Beware this is not a sdist tarball.

* the patch at https://github.com/JohnCremona/eclib/issues/19#issuecomment-314952542
this is absolutely needed.

François

[John H Palmieri]

I successfully built with the current version (not the updated one) of eclib plus the patch you mentioned. I will also try to see if gfortran builds.

[John H Palmieri]

Trying to build gfortran yields the same error as reported at https://trac.sagemath.org/ticket/23898.

  John

[Dima Pasechnik]

I wonder if anyone tried lately using Intel's Fortran on OSX, I understand that with a university affiliation one can get it for free.

https://software.intel.com/en-us/parallel-studio-xe/choose-download/educator-mac-c

[François Bissey]

Trying non gfortran fortran compiler is on my ToDo list. Not necessarily
intel though. You can get community PG compilers for free as well.
Not tried pgcc yet though.

François

[François Bissey]

gfortran 7.2.0 builds out of the box. Don’t know about full blown gcc.

François