leif wrote:
The problem is not that a C compiler is used to compile weight0.c, but
that cf_gmp.h includes <bits/c++config.h> in the first place.
(Although bits/c++config.h is valid C code as well, it's not in the
[C++] include path if you compile a file as C code which includes it.)
But it seems ArchLinux's broken gcc/g++ behaviour triggers the problem.
Though it might still be a genuine Singular bug.
Pong, could you upload/attach your cf_gmp.h? (Should be located in
$SAGE_ROOT/spkg/build/singular-3-1-5.p7/src/factory/, but only after a
failed build or if you use 'sage -f -s ...', or alternatively set
SAGE_KEEP_BUILT_SPKGS=yes.)
I'll take a look at the full Singular build log you attached earlier.
The relevant lines seem to be these:
echo "#!/bin/sh" >gen_cf_gmp.sh
echo "GMP_H_T=\"`g++ -Wall -fno-implicit-templates -I. -I.. -I.
-I/home/pong/sage-5.9/local -I/home/pong/sage-5.9/local/include
-DHAVE_CONFIG_H -I/home/pong/sage-5.9/local/include
-I/home/pong/sage-5.9/local/include -O2 -g -fPIC -M
gen_cf_gmp.cc|grep gmp.h` \"" >>gen_cf_gmp.sh
cat gen_cf_gmp.template >>gen_cf_gmp.sh
/bin/sh gen_cf_gmp.sh
generating cf_gmp.h from /home/pong/sage-5.9/local/include/gmp.h
/usr/include/c++/4.8.0/iosfwd
(Note the iosfwd.)
-leif
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