Robert Bradshaw wrote: > On Oct 6, 2009, at 3:12 AM, Dr. David Kirkby wrote:
>> Hence it's probably safer to have each spkg-install start with >> >> CFLAGS=$SAGE64_CFLAG >> >> and add others as needed. >> >> This would not be an issue if someone write >> >> ./configure CFLAGS="$CFLAGS -foobar" >> >> as the environment variable CFLAGS would not be corrupted. But I think >> in some cases it may be necessary to export CFLAGS, in which case >> relying on anything being there might be unwise. > > Is there not a way to invoke a bash script in such a way that it > can't change the invoking environment? I do not know of one. Perhaps there is. > Alternatively, we should just > set everything fresh between each spkg-install. I would have thought if CFLAGS was cleared in each package, then appended to when needed. i.e. # Clear CFLAGS CFLAGS="" # Add an option such as -m64 when building 64-bit code, # but will not hard-code -m64, as not all compilers use this. if [ $SAGE64="yes" ]; then CFLAGS="$CFLAGS $SAGE64_CFLAG" fi # Create position independent code only on OS X. For GNU compilers # this will mean adding -fPIC, but this can not be assumed. if [ `unsame` = "Darwin" ] ; then CFLAGS="$CFLAGS -$FPIC_FLAG" fi It's certainly possible that some packages might have their own ways of configuring for 64-bit, and those do *not* include the use of adding -m64. Some for example want the ABI set to 64, and will use that information to set their own flags. > These kinds of > options seem to be exactly what the CFLAGS environment variable is > for. It will also increase the likelyhood of upstream makefiles just > working, or getting fixed makefiles upstream. > > - Robert Dave --~--~---------~--~----~------------~-------~--~----~ To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
