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Bug#966184: xfractint: FTBFS with GCC 10: multiple definition of ... due to -fno-common

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Source: xfractint
Version: 20.4.10-2
Severity: serious
Tags: ftbfs sid bullseye
Justification: fails to build from source (but built successfully in the past)
User: debian-gcc@lists.debian.org
Usertags: ftbfs-gcc-10

Hi,

xfractint started to FTBFS when GCC 10 was made the default compiler:

/usr/bin/gcc -o xfractint -I./headers -DXFRACT  -DNOBSTRING   -g -DBIG_ANSI_C -DLINUX -fno-builtin -O2 ./common/3d.o ./common/ant.o ./common/bigflt.o  ./common/biginit.o ./common/bignum.o ./common/bignumc.o ./common/calcfrac.o ./common/cmdfiles.o ./common/decoder.o ./common/editpal.o ./common/encoder.o ./common/evolve.o ./common/f16.o ./common/fracsubr.o ./common/fractalb.o ./common/fractalp.o ./common/fractals.o ./common/fractint.o ./common/framain2.o ./common/frasetup.o ./common/gifview.o ./common/hcmplx.o ./common/help.o ./common/history.o ./common/intro.o ./common/jb.o ./common/jiim.o ./common/line3d.o ./common/loadfdos.o ./common/loadfile.o ./common/loadmap.o ./common/lorenz.o ./common/lsys.o ./common/lsysf.o ./common/memory.o ./common/miscfrac.o ./common/miscovl.o ./common/miscres.o ./common/mpmath_c.o ./common/parser.o ./common/parserfp.o ./common/plot3d.o ./common/printer.o ./common/prompts1.o ./common/prompts2.o ./common/realdos.o ./common/rotate.o ./common/slideshw.o ./common/soi.o ./common/soi1.o ./common/stereo.o ./common/targa.o ./common/testpt.o ./common/tgaview.o ./common/zoom.o ./unix/calcmand.o ./unix/calmanfp.o ./unix/diskvidu.o ./unix/fpu087.o ./unix/fracsuba.o ./unix/general.o ./unix/unix.o ./unix/xfcurses.o ./unix/unixscr.o ./unix/video.o -L/usr/X11R6/lib -lX11 -lm
/usr/bin/ld: ./common/fractals.o:/build/xfractint-20.4.10/common/fractals.c:3434: multiple definition of `b_const'; ./common/fractalb.o:/build/xfractint-20.4.10/common/fractalb.c:24: first defined here
/usr/bin/ld: ./unix/video.o:/build/xfractint-20.4.10/unix/video.c:14: multiple definition of `curwin'; ./unix/xfcurses.o:/build/xfractint-20.4.10/unix/xfcurses.c:78: first defined here
/usr/bin/ld: ./unix/video.o:/build/xfractint-20.4.10/unix/video.c:47: multiple definition of `boxcolor'; ./common/zoom.o:/build/xfractint-20.4.10/common/zoom.c:38: first defined here
collect2: error: ld returned 1 exit status
make[1]: *** [Makefile:302: xfractint] Error 1

More information about the corresponding GCC change can be found here:
https://gcc.gnu.org/gcc-10/porting_to.html
"Default to -fno-common"


Andreas

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Bug#966184: xfractint: FTBFS with GCC 10: multiple definition of ... due to -fno-common Andreas Beckmann <anbe@debian.org> - 2020-07-24 14:10 +0200

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