When we are building MPIR as dependency for GCC, build MPIR without the C++ interface. After GCC is installed, MPIR is built again. The second time we do build the C++ interface. This would allow for building Sage on systems without a C++ compiler.
spkg: http://boxen.math.washington.edu/home/jdemeyer/spkg/mpir-2.1.3.p10.spkg
Superseded by #11616.
Depends on #11616
CC: @nexttime
Component: packages: standard
Reviewer: Jeroen Demeyer
Issue created by migration from https://trac.sagemath.org/ticket/12782