#10252: ecm does not compile on some 32-bit Linux systems
------------------------+---------------------------------------------------
Reporter: jdemeyer | Owner: tbd
Type: defect | Status: needs_info
Priority: major | Milestone: sage-4.6.1
Component: packages | Keywords: ecm spkg-install
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Changes (by leif):
* status: new => needs_info
Comment:
So we at least still have the problem of adding `-m64` if `SAGE64=yes`
(i.e., if we want a 64-bit build on systems that default to 32-bit
builds):
{{{
#!sh
...
# Note that GMP-ECM is written in C (and assembler) - no C++ sources.
if [ "$SAGE64" = yes ]; then
echo "Building a 64-bit version of GMP-ECM"
if [ -z "$CFLAG64" ]; then
CFLAG64=-m64
fi
CFLAGS="$CFLAGS $CFLAG64 -fPIC"
LDFLAGS="$CFLAG64"; export LDFLAGS
else
CFLAGS="$CFLAGS -fPIC"
fi
# We add debug symbols by default;
if [ "$SAGE_DEBUG" = yes ]; then
# Disable optimization:
CFLAGS="$CFLAGS -g -O0"
else
# Enable optimization, may be overridden by user settings:
CFLAGS="-g -O3 $CFLAGS"
fi
export CFLAGS # usually redundant, but safe(r)
...
}}}
Of course I could add "our" (or worse, also ''any user-specified'')
`CFLAGS` to `CC`, i.e. the C compiler command, and `unset CFLAGS` to make
ECM's effective, but I wouldn't like that. (And some settings then would
get overridden by ECM's `CFLAGS` anyway.)
----
An IMHO better solution is to also add `-march=native` to `CFLAGS`, since
this enables SSE (to be precise, allows SSE2 instructions) if supported by
the processor (when `configure` defines `HAVE_SSE2`), ignoring
`SAGE_FAT_BINARY` at least for the moment (unless ECM's `configure` has an
option like `--disable-sse` or similar; I haven't really checked that yet,
perhaps just `--enable-sse2=no` on ''32-bit'' x86).
[[BR]]
I'm not sure what happens if we configure with `CFLAGS` set and `--enable-
gmp-cflags=no` (which seems to be more appropriate when using ECM with
MPIR).
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10252#comment:14>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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