Hi,

With GC-8.0.2, I get:

--------------

if test -n ""; then \
          g++ -Wall -DHAVE_CONFIG_H -D_FILE_OFFSET_BITS=64 -DUSEGC  -pthread -DF FTWPP_SINGLE_THREAD  -I/opt/texlive/2018/include/gc -I/usr/include/gc -I/usr/inc lude/tirpc -std=c++11 -g -O3 -fno-var-tracking -o asy camperror.o path.o drawpat h.o drawlabel.o picture.o psfile.o texfile.o util.o settings.o guide.o flatguide .o knot.o drawfill.o path3.o drawpath3.o drawsurface.o beziercurve.o bezierpatch .o pen.o pipestream.o types.o builtin.o gsl.o runtime.o runbacktrace.o runpictur e.o runlabel.o runhistory.o runarray.o runfile.o runsystem.o runpair.o runtriple .o runpath.o runpath3d.o runstring.o runmath.o env.o genv.o stm.o dec.o errormsg .o callable.o name.o symbol.o entry.o exp.o newexp.o stack.o camp.tab.o lex.yy.o  access.o virtualfieldaccess.o absyn.o record.o interact.o fileio.o fftw++asy.o simpson.o coder.o coenv.o impdatum.o locate.o parser.o program.o application.o v arinit.o fundec.o refaccess.o envcompleter.o process.o constructor.o array.o Del aunay.o predicates.o PRCbitStream.o oPRCFile.o PRCdouble.o writePRC.o glrender.o  tr.o arcball.o algebra3.o quaternion.o main.o revision.o asy.o -lOSMesa -lgl ut -lGLU -lGL -lfftw3 -ltirpc -lreadline -lrt -lsigsegv -lz -lm -L/opt/texlive/2
018/lib -lgc  -ltermcap    -s -static; \
else \
  ln -sf GUI/xasy.py xasy; \
  g++ -Wall -DHAVE_CONFIG_H -D_FILE_OFFSET_BITS=64 -DUSEGC -pthread -DFFTWPP_SI NGLE_THREAD  -I/opt/texlive/2018/include/gc -I/usr/include/gc -I/usr/include/tirpc -std=c++11 -g -O3 -fno-var-tracking -o asy camperror.o path.o drawpath.o drawlabel.o picture.o psfile.o texfile.o util.o settings.o guide.o flatguide.o knot.o drawfill.o path3.o drawpath3.o drawsurface.o beziercurve.o bezierpatch.o pen.o pipestream.o types.o builtin.o gsl.o runtime.o runbacktrace.o runpicture.o runlabel.o runhistory.o runarray.o runfile.o runsystem.o runpair.o runtriple.o runpath.o runpath3d.o runstring.o runmath.o env.o genv.o stm.o dec.o errormsg.o callable.o name.o symbol.o entry.o exp.o newexp.o stack.o camp.tab.o lex.yy.o access.o virtualfieldaccess.o absyn.o record.o interact.o fileio.o fftw++asy.o simpson.o coder.o coenv.o impdatum.o locate.o parser.o program.o application.o varinit.o fundec.o refaccess.o envcompleter.o process.o constructor.o array.o Delaunay.o predicates.o PRCbitStream.o oPRCFile.o PRCdouble.o writePRC.o glrender.o tr.o arcball.o algebra3.o quaternion.o main.o revision.o   -lOSMesa -lglut -lGLU -lGL -lfftw3 -ltirpc -lreadline -lrt -lsigsegv -lz -lm -L/opt/texlive/2018/lib -lgc -lncurses    ; \
fi

/usr/bin/ld: picture.o: in function `operator new(unsigned long, GCPlacement, void (*)(void*, void*), void*)':
/usr/include/gc/gc_cpp.h:545: undefined reference to `GC_throw_bad_alloc()'
/usr/bin/ld: settings.o: in function `operator new(unsigned long, GCPlacement, void (*)(void*, void*), void*)':
/usr/include/gc/gc_cpp.h:545: undefined reference to `GC_throw_bad_alloc()'
/usr/bin/ld: /usr/include/gc/gc_cpp.h:545: undefined reference to `GC_throw_bad_alloc()'
/usr/bin/ld: settings.o: in function `gc::operator new(unsigned long)':
/usr/include/gc/gc_cpp.h:410: undefined reference to `GC_throw_bad_alloc()'
/usr/bin/ld: /usr/include/gc/gc_cpp.h:410: undefined reference to `GC_throw_bad_alloc()' /usr/bin/ld: settings.o:/usr/include/gc/gc_cpp.h:410: more undefined references to `GC_throw_bad_alloc()' follow
collect2: error: ld returned 1 exit status
make[1]: *** [Makefile:114: asy] Error 1

---------------

There is a commit:

https://github.com/vectorgraphics/asymptote/commit/38a59370dc5ac720c29e1424614a10f7384b943f

This can be done with a sed:

sed -i '$a\
#ifdef USEGC\
GC_API void GC_CALL GC_throw_bad_alloc() {\
  std::bad_alloc();\
}\
#endif' main.cc

I'll commit that if nobody objects

Pierre


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