[gentoo-science] sage-singular

[Steven Trogdon <strogdon@d.umn.edu>]

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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/singular-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.

Steve

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