We know from recent discussions over sage-env and the hassles that
http://trac.sagemath.org/sage_trac/ticket/7818
caused, that setting CFLAGS, CXXFLAGS etc globally will cause a build failure in
Sage. It would therefore seem sensible that we exit with an error message if
someone sets CFLAGS when building Sage.
However, the downside of doing this is that if they later run Sage, with CFLAGS
set, Sage will exit with an error message.
sage-env could easily be modified to check if CFLAGS is set, so catching cases
where someone has set CFLAGS globally. Should this be done or not?
Dave
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