'CC = clang++' fails to compile, seg fault with g++

[2ahunter]

With the latest makefile, I changed CC = clang-3.8 and it fails to compile.
It compiles fine with CC=g++, as suggested in the README, however I get segmentation faults when I test cmix:

aaron@aaron-HP-EliteBook-840-G1:~/cmpe202/cmix$ ./cmix -n README readme_cmp Segmentation fault (core dumped)

Any ideas?

[byronknoll]

Hi, cmix should work with recent versions of both g++ and clang. What version of g++ are you using? Here are some ideas:

• use a more recent version of g++ or clang
• try compiling with "-O3" instead of "-Ofast -march=native"

[2ahunter]

Thanks--I have g++ 5.4, I think it's the installed version with Ubuntu 16. clang-3.8. I'll try the '-O3' option first, then update the compilers.

[2ahunter]

upgraded to g++ -7 and compiled with both original makefile and with -O3. both show a segmentation fault. I'll try with clang next.

[2ahunter]

Nope, still get segmentation fault.

[byronknoll]

Hmm this might be difficult to debug. How much RAM does your computer have? Which OS are you using? If you run cmix without any arguments does it also segfault? When I see a segfault on my own computer I usually use gdb to debug, but that will be difficult if you don't already know how to use gdb.

[tommythorn]

Well, it would be fairly useful to simply prefix the invocation with gdb --args, typing run at the (gdb) prompt, and upon the segfault run bt which will give a backtrace.

[byronknoll]

I am closing this issue since it hasn't been updated. Feel free to re-open if there are new updates.