pbuild: mwrank.so needs to be build as a C++ extension

[sagetrac-mabshoff]

Some people have reported mwrank.so missing some symbols at startup when compiled with pbuild, but the old build system is fine.

Working:

g++ -pthread -shared build/temp.linux-x86_64-2.5/sage/libs/mwrank/mwrank.o 
build/temp.linux-x86_64-2.5/sage/libs/mwrank/wrap.o -L/scratch/mabshoff/
release-cycle/sage-3.0.1.final/local//lib -lcsage -lcurvesntl -lg0nntl 
-ljcntl -lrankntl -lntl -lgmp -lgmpxx -lstdc++ -lm -lpari -lstdc++ -lntl 
-o build/lib.linux-x86_64-2.5/sage/libs/mwrank/mwrank.so

Non-working:

gcc -O3 -g -fwrapv -shared -fno-strict-aliasing /mnt/drive_hda1/sagefiles/
sage-3.0.1.rc0/devel/sage/build/temp/sage/libs/mwrank/mwrank.o -L/home/wdj/
wdj/sagefiles/sage-3.0.1.rc0/local/lib  -lcsage  -lcurvesntl  -lg0nntl  
-ljcntl  -lrankntl  -lntl -lgmp  -lgmpxx  -lstdc++  -lm  -lpari  -lstdc++  
-lntl  -o /mnt/drive_hda1/sagefiles/sage-3.0.1.rc0/devel/sage-main/build/
sage/libs/mwrank/mwrank.so

mwrank.so is a C wrapper around a C++ extension, so on some systems the linker ends up either being stupid or clever depending on your perspective.

Cheers,

Michael

Component: pbuild

Issue created by migration from https://trac.sagemath.org/ticket/3101

[garyfurnish]

comment:1

Attachment: trac_extcode_3101.patch.gz

[sagetrac-mabshoff]

comment:2

Patch looks good to me.

Cheers,

Michael

[sagetrac-mabshoff]

comment:3

Merged in Sage 3.0.1.final