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VCS segfaults when compiling code with overridden system calls

See original GitHub issue

In the sim_exit testcase:

Parsing design file '/home/chiggs/code/github/cocotb/examples/sim_exit/tests/../hdl/close_module.v'
Top Level Modules:
       close_module
TimeScale is 1 ps / 1 ps
Starting vcs inline pass...
Got SIGSEGV

An unexpected termination has occurred in /tools/synopsys/vcs/I-2014.03-2/amd64/bin/vcs1 because of a fatal signal

Stmt $info at /home/chiggs/code/github/cocotb/examples/sim_exit/tests/../hdl/close_module.v, 58
Stmt  at /home/chiggs/code/github/cocotb/examples/sim_exit/tests/../hdl/close_module.v, 58
Stmt  at /home/chiggs/code/github/cocotb/examples/sim_exit/tests/../hdl/close_module.v, 55
Process  /home/chiggs/code/github/cocotb/examples/sim_exit/tests/../hdl/close_module.v, 55

During addModuleItems Module close_module declared at /home/chiggs/code/github/cocotb/examples/sim_exit/tests/../hdl/close_module.v, 33
 XModule close_module declared at /home/chiggs/code/github/cocotb/examples/sim_exit/tests/../hdl/close_module.v, 33
 Hsim mod number=1 

Command line: /tools/synopsys/vcs/I-2014.03-2/amd64/bin/vcs1 -Mcc=gcc -Mcplusplus=g++ -Masflags= "-Mcfl= -pipe -fPIC -O -I/tools/synopsys/vcs/I-2014.03-2/include " "-Mldflags= " -Mout=simv -Mamsrun= -Mvcsaceobjs= "-Mobjects= /tools/synopsys/vcs/I-2014.03-2/amd64/lib/libvirsim.so /tools/synopsys/vcs/I-2014.03-2/amd64/lib/liberrorinf.so /tools/synopsys/vcs/I-2014.03-2/amd64/lib/libsnpsmalloc.so " -Msaverestoreobj=/tools/synopsys/vcs/I-2014.03-2/amd64/lib/vcs_save_restore_new.o -Mcrt0= -Mcrtn= -Mcsrc= "-Msyslibs=-ldl -lm -lm " +acc+1 -P pli.tab +define+COCOTB_SIM=1 -Xcbug=0x1 -load libvpi.so -full64 -picarchive +cli+4 +vcsd +itf+/tools/synopsys/vcs/I-2014.03-2/amd64/lib/vcsd.tab +vpi -debug=3 +memcbk +vpi -sverilog +vpi -gen_obj /home/chiggs/code/github/cocotb/examples/sim_exit/tests/../hdl/close_module.v

--- Stack trace follows:
[Thread debugging using libthread_db enabled]
0x00000033ee2ac61e in waitpid () from /lib64/libc.so.6
#0  0x00000033ee2ac61e in waitpid () from /lib64/libc.so.6
#1  0x00000033ee23e609 in do_system () from /lib64/libc.so.6
#2  0x00000000040baac5 in tracker::StackAnnotator::getGdbOutput(char const*, char const*, char const*, char const*) ()
#3  0x00000000040bb08b in tracker::StackAnnotator::dumpStackByGdb(char const*, char const*) ()
#4  0x00000000040bc3b6 in tracker::StackAnnotator::dumpProcessStack(unsigned int, char const*, char const*) ()
#5  0x00000000040b17d8 in ?? ()
#6  0x0000000003d45887 in stackTraceHandler ()
#7  0x0000000003d4420e in SigHandler ()
#8  <signal handler called>
#9  0x00000000030e8600 in SetupMBDaiCapTsk ()
#10 0x0000000002cd0e9a in vcsAddModuleSysTask(Stmt const*, mb*) ()
#11 0x0000000002cdd963 in ?? ()
#12 0x0000000002cdbd80 in ?? ()
#13 0x0000000002cdb6d5 in ?? ()
#14 0x0000000002cde653 in ?? ()
#15 0x0000000002cdfd66 in vcsPutTokenModule(XModule const*) ()
#16 0x0000000002cedebc in vcsAddModuleItems(XModule*) ()
#17 0x0000000002cf3650 in ?? ()
#18 0x0000000002cf405b in vcsCreateModuleStruct(int) ()
#19 0x00000000012320b2 in doRadify_vir2vcsAll ()
#20 0x0000000002fc21dc in ?? ()
#21 0x0000000002fc84be in c_main ()
#22 0x0000000000e68411 in main ()
Completed context dump phase data location 'Stmt'* 'Stmt'* 'Stmt'* 'Process'* 'Module'* 'XModule'*
CPU time: .646 seconds to compile
make[1]: *** [sim_build/simv] Error 1
make[1]: Leaving directory `/home/chiggs/code/github/cocotb/examples/sim_exit/tests'
make: *** [sim] Error 2

Commenting out the system calls ($info, $fatal) etc. allow compilation to continue.