Singular does not build on Ubuntu Oneiric

[dandrake]

Due to fussier linkers, Singular will not build on the current version of Ubuntu Oneiric (11.10). This was reported at https://groups.google.com/d/topic/sage-devel/aL8b9phz3Xc/discussion:

../kernel/libkernel.a(mod_raw.o): In function `dynl_open':
/home/foo/sage-4.7.2.alpha2/spkg/build/singular-3-1-1-4.p13/src/kernel/mod_raw.cc:217: undefined reference to `dlopen'
../kernel/libkernel.a(mod_raw.o): In function `dynl_sym':
/home/foo/sage-4.7.2.alpha2/spkg/build/singular-3-1-1-4.p13/src/kernel/mod_raw.cc:228: undefined reference to `dlsym'
../kernel/libkernel.a(mod_raw.o): In function `dynl_close':
/home/foo/sage-4.7.2.alpha2/spkg/build/singular-3-1-1-4.p13/src/kernel/mod_raw.cc:233: undefined reference to `dlclose'
../kernel/libkernel.a(mod_raw.o): In function `dynl_error':
/home/foo/sage-4.7.2.alpha2/spkg/build/singular-3-1-1-4.p13/src/kernel/mod_raw.cc:238: undefined reference to `dlerror'
collect2: ld returned 1 exit status
make[2]: *** [iparith.inc] Error 1
make[2]: Leaving directory `/home/foo/sage-4.7.2.alpha2/spkg/build/singular-3-1-1-4.p13/src/Singular'
make[1]: *** [install] Error 1
make[1]: Leaving directory `/home/foo/sage-4.7.2.alpha2/spkg/build/singular-3-1-1-4.p13/src'
make: *** [/home/foo/sage-4.7.2.alpha2/local/bin/Singular-3-1-1] Error 2
Unable to build Singular.

(Cf. also [comment:ticket:11674:27] ff.)

The fix is to flip the order of -ldl and -lkernel, or append a second -ldl in the linking steps.

This may already be fixed upstream (cf. #10903); if so, this ticket should be closed. If not, the Sage/Singular Days (SD34) would be the perfect time to fix it.

According to Hannes, this is now fixed in svn revision 14381, i.e., not yet in any stable upstream release, so we should incorporate at least that patch into some new Singular spkg.

Fixed spkg to be found at #10903.

Depends on #10903

Upstream: Workaround found; Bug reported upstream.

CC: @burcin

Component: packages: standard

Keywords: singular, linker, sd34 -ldl libkernel mod_raw.cc

Reviewer: Volker Braun

Issue created by migration from https://trac.sagemath.org/ticket/11769

[nexttime]

Changed keywords from singular, linker, sd34 to singular, linker, sd34 -ldl libkernel mod_raw.cc

[nexttime]

Upstream: Workaround found; Bug reported upstream.

[nexttime]

This may already be fixed upstream (cf. #10903); if so, this ticket should be closed. If not, the Sage/Singular Days (SD34) would be the perfect time to fix it.

It is not fixed in Singular 3-1-3-2 (current latest stable), nor in the current svn revision 14378.

Upstream report: http://www.singular.uni-kl.de:8002/trac/ticket/368

[nexttime]

comment:3

For the record: So far nothing happened on the upstream ticket.

[nexttime]

comment:5

Replying to @nexttime:

For the record: So far nothing happened on the upstream ticket.

According to upstream, they've now reluctantly fixed this, in svn revision 14381. (Haven't checked this yet.)

[nexttime]

comment:7

Making this a blocker, since IMHO at least a work-around should be in the final Sage 4.7.2, likely to be released [right] before the final Ubuntu 11.10 (Oneiric Ocelot).

If we don't get a new Singular spkg fixing this from SD34, we should provide an spkg just adding -ldl to LDFLAGS (on Linux only), or applying the upstream fix from the svn. (Haven't tried the latter yet; should IMHO work, despite the age of our current Singular version.)

[vbraun]

Dependencies: #10903

[vbraun]

comment:8

The new Singular-3-1-3-3 spkg from #10903 links with -lkernel in front of -ldl:

g++ -O2 -g -fPIC -I.. -I/home/vbraun/Sage/sage/local -pipe -I. -I.. -I/home/vbraun/Sage/sage/local -I/h
ome/vbraun/Sage/sage/local/include -I/home/vbraun/Sage/sage/local/include -I/home/vbraun/Sage/sage/loca
l/include   -fno-implicit-templates -I.. -I/home/vbraun/Sage/sage/local -DNDEBUG -DOM_NDEBUG -Dx86_64_L
inux -DHAVE_CONFIG_H \
  -o Singular \
  tesths.cc iparith.o mpsr_Tok.o claptmpl.o\
  grammar.o scanner.o attrib.o blackbox.o eigenval_ip.o extra.o fehelp.o feOpt.o ipassign.o ipconv.o ipid.o iplib.o ipprint.o ipshell.o newstruct.o lists.o sdb.o fglm.o interpolation.o silink.o ssiLink.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_ip.o calcSVD.o pipeLink.o Minor.o MinorProcessor.o MinorInterface.o bigintm.o pyobject_setup.o bbcone.o bbfan.o denom_list.o minpoly.o  slInit_Dynamic.o -rdynamic -L/home/vbraun/Sage/sage/local/kernel -L../kernel -lkernel -L/home/vbraun/Sage/sage/local/lib -L/home/vbraun/Sage/sage/local/lib   -ldl -lm -lsingfac -lsingcf -lntl -lgmp -lreadline -ltermcap -lm  -lnsl -lbsd  -lomalloc  ../kernel/mmalloc.o 

So this issue is solved by its dependency. I will set this ticket to positive review.

[vbraun]

Reviewer: Volker Braun