undefined reference to `__muloti4' (crystal 0.31.1-1)

[gummybears]

$ uname -a
Linux laptop 4.4.0-21-generic #37-Ubuntu SMP Mon Apr 18 18:33:37 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

$ crystal version
Crystal 0.31.1 [0e2e1d067] (2019-09-30)

LLVM: 8.0.0
Default target: x86_64-unknown-linux-gnu

$ crystal build src/repl/main.cr -o a.out --debug
I-nt128.o: In function `**':
/usr/share/crystal/src/int.cr:272: undefined reference to `__muloti4'
/usr/share/crystal/src/int.cr:274: undefined reference to `__muloti4'
I-nterpreter5858V-M-.o: In function `do_negate':
/home/gummybears/crystal/interp/src/vm/do.cr:39: undefined reference to `__muloti4'
I-nterpreter5858V-M-.o: In function `operation':
/home/gummybears/crystal/interp/src/vm/value.cr:77: undefined reference to `__muloti4'
I-nterpreter5858V-M-.o: In function `do_imultiply':
/home/gummybears/crystal/interp/src/vm/do.cr:645: undefined reference to `__muloti4'
I-nterpreter5858V-M-.o:/home/gummybears/crystal/interp/src/vm/do.cr:716: more undefined references to `__muloti4' follow
collect2: error: ld returned 1 exit status
Error: execution of command failed with code: 1: `cc "${@}" -o '/home/gummybears/crystal/interp/a.out'  -rdynamic  -lreadline -lz -lxml2 -lpcre -lm /usr/bin/../lib/crystal/lib/libgc.a -lpthread /usr/share/crystal/src/ext/libcrystal.a -levent -lrt -ldl -L/usr/bin/../lib/crystal/lib -L/usr/lib -L/usr/local/lib`

[gummybears]

I think this is the cause http://lists.llvm.org/pipermail/llvm-bugs/2013-June/028981.html
as I am doing i128 multiplications

[bcardiff]

@gummybears, I left a comment at #7514 (comment) . If you want int128 bits right now you might need to to compile and link compiler-rt.

[gummybears]

@bcardiff,
I don't need the int128 bits multiplication/division/addition/subtraction right now, I am already using it,
no problems with Crystal 0.30.1

Crystal 0.30.1 [5e6a1b672] (2019-08-12)
LLVM: 4.0.0
Default target: x86_64-unknown-linux-gnu

[bcardiff]

@gummybears but the stacktrace shows you are. Overflow is now enabled by default and that changes some operations. Use -Ddisable_overflow to double-check this. This flag is temporal though. More info at #8170

[gummybears]

Things are getting confusing now. I am working with Crystal 0.30.1 and I am using int128 which works fine.

However today I thought to do an upgrade from Crystal 0.30.1 to 0.31.1 and see what happens with my code and test specs. So I decided to run my test specs but alas I am getting a link error which I am reporting here.

[bcardiff]

muloti4 is used to detect overflow in Int128. You should get the same error in 0.30.1 if -Dpreview_overflow is used.

[gummybears]

Sorry for the delay, I had to read the links you were referring to. I did a test per your suggestion with the -Dpreview_overflow flag and indeed I am seeing the same error message with 0.30.1.
I am not going to use compiler-rt but think I will use i64 instead.
Thanks for the help