Cross-compilation to GNU/Hurd broken on core-updates

[ludo@gnu.org (Ludovic Courtès)]

Hello Manolis and all!

On ‘core-updates’, the cross-compiler for i586-pc-gnu fails to build:

  https://hydra.gnu.org/build/2099030

The relevant part is:

--8<---------------cut here---------------start------------->8---
checking whether i586-pc-gnu-gcc supports -Wall... yes
checking for socket libraries... checking for connect... /gnu/store/s1r43qhlmcf1fhnrsjgsnc40862070cl-bash-minimal-4.4.12/bin/bash ../../gcc-5.4.0/gcc/../move-if-change tmp-constants.h insn-constants.h
echo timestamp > s-constants
build/genenums ../../gcc-5.4.0/gcc/common.md ../../gcc-5.4.0/gcc/config/i386/i386.md \
   > tmp-enums.c
/gnu/store/s1r43qhlmcf1fhnrsjgsnc40862070cl-bash-minimal-4.4.12/bin/bash ../../gcc-5.4.0/gcc/../move-if-change tmp-enums.c insn-enums.c
yes
checking for gethostbyname... echo timestamp > s-enums
g++ -c -DIN_GCC     -DGENERATOR_FILE -I. -Ibuild -I../../gcc-5.4.0/gcc -I../../gcc-5.4.0/gcc/build -I../../gcc-5.4.0/gcc/../include  -I../../gcc-5.4.0/gcc/../libcpp/include  \
	-o build/min-insn-modes.o min-insn-modes.c
yes

checking for exported symbols... /tmp/guix-build-gcc-5.4.0.drv-0/gcc-5.4.0/libcc1/configure: line 14531: -T: command not found
yes
checking for -rdynamic... /gnu/store/s1r43qhlmcf1fhnrsjgsnc40862070cl-bash-minimal-4.4.12/bin/bash ../../gcc-5.4.0/gcc/../move-if-change tmp-gtype.state gtype.state
g++ -c -DIN_GCC     -DGENERATOR_FILE -I. -Ibuild -I../../gcc-5.4.0/gcc -I../../gcc-5.4.0/gcc/build -I../../gcc-5.4.0/gcc/../include  -I../../gcc-5.4.0/gcc/../libcpp/include  \
	-o build/gencheck.o ../../gcc-5.4.0/gcc/gencheck.c
build/gengtype  \
                    -r gtype.state
/tmp/guix-build-gcc-5.4.0.drv-0/gcc-5.4.0/libcc1/configure: line 14541: -T: command not found
no
checking for library containing dlopen... echo timestamp > s-gtype
if [ xinfo = xinfo ]; then \
	makeinfo --split-size=5000000 --split-size=5000000 --no-split -I . -I ../../gcc-5.4.0/gcc/doc \
		-I ../../gcc-5.4.0/gcc/doc/include -o doc/gccint.info ../../gcc-5.4.0/gcc/doc/gccint.texi; \
fi
g++ -DIN_GCC     -DGENERATOR_FILE  -o build/gencheck \
    build/gencheck.o ../build-x86_64-unknown-linux-gnu/libiberty/libiberty.a
-ldl
checking for -fPIC -shared... yes
configure: error: 
   Building GCC with plugin support requires a host that supports
   -fPIC, -shared, -ldl and -rdynamic.
make[1]: *** [Makefile:9376: configure-libcc1] Error 1
--8<---------------cut here---------------end--------------->8---

I’m not sure if anything changed in this area compared to ‘master’.

Ideas?

Thanks,
Ludo’.