Jaap Spies wrote:
Dr. David Kirkby wrote:
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.
I think it is more sensible that the spkgs involved do an 'unset
CFLAGS', etc..
Laying the resposibilities were they belong.
A lot of spkgs will not built in 64 bit mode unless CFLAGS has a
sensible flag.
Jaap
I would normally agree with you, but think this could be risky.
Having had my fingers burnt once over setting CFLAGS globally, I would avoid
that at all costs. Which is why I wondered whether we should check they are not
set, to avoid any surprises later on.
As I proposed the other day, which William liked, we set
SAGE_COMMON_CFLAGS
to a sensible set of compiler flags, suitable for most packages. spkg-install
then use
CFLAGS="SAGE_COMMON_CFLAGS"
export CFLAGS
That way, CFLAGS is not set globally, but any package can get a sensible set if
they choose to.
This may not be the most convenient approach, but it is the most risk-free.
Dave
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