[tlbuild] Building asymptote statically against libstdc++

[Nelson H. F. Beebe]

Mojca, have you tried the -static-libstdc++ flag for g++?  It is
supported since gcc-4.9 (2013 and later).  That appears to be the
proper way to avoid dependence on the libstdc++.so file, and is
cleaner and shorter than switching between static and dynamic
libraries.

I'm writing up a new section on problems at the end of this Web page,

	http://www.math.utah.edu/pub/texlive/

and that point is already covered.

Here is the gcc info node section documenting the proposed option:

'-static-libstdc++'
     When the 'g++' program is used to link a C++ program, it normally
     automatically links against 'libstdc++'.  If 'libstdc++' is
     available as a shared library, and the '-static' option is not
     used, then this links against the shared version of 'libstdc++'.
     That is normally fine.  However, it is sometimes useful to freeze
     the version of 'libstdc++' used by the program without going all
     the way to a fully static link.  The '-static-libstdc++' option
     directs the 'g++' driver to link 'libstdc++' statically, without
     necessarily linking other libraries statically.

-------------------------------------------------------------------------------
- Nelson H. F. Beebe                    Tel: +1 801 581 5254                  -
- University of Utah                    FAX: +1 801 581 4148                  -
- Department of Mathematics, 110 LCB    Internet e-mail: beebe at math.utah.edu  -
- 155 S 1400 E RM 233                       beebe at acm.org  beebe at computer.org -
- Salt Lake City, UT 84112-0090, USA    URL: http://www.math.utah.edu/~beebe/ -
-------------------------------------------------------------------------------


-------------------------------------------------------------------------------
- Nelson H. F. Beebe                    Tel: +1 801 581 5254                  -
- University of Utah                    FAX: +1 801 581 4148                  -
- Department of Mathematics, 110 LCB    Internet e-mail: beebe at math.utah.edu  -
- 155 S 1400 E RM 233                       beebe at acm.org  beebe at computer.org -
- Salt Lake City, UT 84112-0090, USA    URL: http://www.math.utah.edu/~beebe/ -
-------------------------------------------------------------------------------