Re: [gentoo-science] sage-singular

["François Bissey" <f.r.bissey@massey.ac.nz>]

> François,
> 
> Singular -- good. I do get -fPIC compile issues here on my amd64:
> 
> g++ -shared  -o libsingular.so \
>          libsingular-tesths.o iparith.o mpsr_Tok.o claptmpl.o \
>          grammar.o scanner.o attrib.o eigenval_ip.o extra.o fehelp.o
> feOpt.o ipassign.o ipconv.o ipid.o iplib.o ipprint.o ipshell.o lists.o
> sdb.o fglm.o interpolation.o silink.o subexpr.o janet.o wrapper.o
> libparse.o sing_win.o gms.o pcv.o maps_ip.o walk.o walk_ip.o cntrlc.o
> misc.o calcSVD.o  slInit_Dynamic.o -lkernel -L../kernel -L../factory
> -L../libfac
> -L/var/tmp/portage/sci-mathematics/sage-singular-3.1.0.4.20100214/work/sing
> ular-3-1-0-4-20100214/src/build/opt/sage/local/lib64 -lsingfac -lsingcf
> -lntl -lreadline -lgmp -lomalloc
> /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.4/../../../../x86_64-pc-linux-gnu/bin/
> ld: libsingular-tesths.o: relocation R_X86_64_32 against `a local symbol'
> can not be used when making a shared object; recompile with -fPIC
> 
> I've tinkered with this in the past and the following allowed building
> to proceed.
> 
>          sed -e "s:@CFLAGS@:@CFLAGS@ -fPIC:" -e
> "s:@CXXFLAGS@:@CXXFLAGS@ -fPIC:" \
>                  -i */Makefile.in || die "failed to fix CFLAGS in
> Makefile.in files"
>          sed -e "s:@CFLAGS@:@CFLAGS@ -fPIC:" -e
> "s:@CXXFLAGS@:@CXXFLAGS@ -fPIC:" \
>                  -i factory/GNUmakefile.in || die "failed to fix CFLAGS
> in GNUmakefile.in"
>          sed -e "s:{libdir} \${LIBSINGULAR_LIBS}:{libdir} -Wl,-soname
> \${LIBSINGULAR_LIBS}:" \
>                  -i Singular/Makefile.in || die "failed to fix LDFLAGS
> in Makefile.in"
> 
> but this may not be the best way to fix things. I did notice that Sage
> builds Singular with -fPIC for all architectures.
> 
Hi Steve,

indeed you would! -fPIC is mandatory on amd64 I think.
I was concerned that we shouldn't build the binaries or the static libraries
with -fPIC. That being said it looks like all those static libraries are 
useless.

Francois