arc/orc generate invalid openMP code

[pmetras]

OpenMP code can't be compiled with --gc:arc or --gc:orc.

Example

{.passC: "-fopenmp".}
{.passL: "-fopenmp".}
{.pragma: omp, header:"omp.h".}
proc omp_get_num_threads*(): cint {.omp.}
proc omp_get_max_threads*(): cint {.omp.}
proc omp_get_thread_num*(): cint {.omp.}

proc main =
  var n: int = 0
  for i in 0 || omp_get_max_threads():
    inc(n, omp_get_thread_num())

  echo "n=" & $n
  echo "max_threads=" & $omp_get_max_threads()

main()

Current Output

$ nim c -d:openmp --stackTrace:off --gc:arc toto
Hint: used config file '.../.choosenim/toolchains/nim-1.4.0/config/nim.cfg' [Conf]
Hint: used config file '.../.choosenim/toolchains/nim-1.4.0/config/config.nims' [Conf]
....CC: stdlib_system.nim
CC: toto.nim
.../.cache/nim/toto_d/@mtoto.nim.c: In function ‘main__6Zr46bVUB8DQ9cxJjNkHcSw’:
.../.cache/nim/toto_d/@mtoto.nim.c:145:85: error: invalid branch to/from OpenMP structured block
  145 |   if (nimAddInt(n, ((NI) (T4_)), &TM__7CcE0BWqWMN0aXUZigTrnw_2)) { raiseOverflow(); goto LA1_;
      |                                                                                     ^~~~

Error: execution of an external compiler program 'gcc -c  -w -fmax-errors=3 -fopenmp   -I.../.choosenim/toolchains/nim-1.4.0/lib -I.../Development/fastparse -o .../.cache/nim/toto_d/@mtoto.nim.c.o .../.cache/nim/toto_d/@mtoto.nim.c' failed with exit code: 1

Expected Output

That the program compiles, like when using default GC.

$ nim -v
Nim Compiler Version 1.4.0 [Linux: amd64]
Compiled at 2020-10-16
Copyright (c) 2006-2020 by Andreas Rumpf

git hash: bdcd87afca238a0a7b2c70971827cf9172817b12
active boot switches: -d:release

[alaviss]

Seems to be an --exceptions:goto issue. Can you try adding --exceptions:setjmp?

[pmetras]

I confirm that compilation with --exceptions:setjump --gc:arc is successful.

$ nim c --exceptions:setjmp --gc.arc toto
Hint: used config file '.../.choosenim/toolchains/nim-1.4.0/config/nim.cfg' [Conf]
Hint: used config file '.../.choosenim/toolchains/nim-1.4.0/config/config.nims' [Conf]
....CC: stdlib_io.nim
CC: stdlib_system.nim
CC: toto.nim

Hint:  [Link]
Hint: 22174 lines; 8.403s; 25.574MiB peakmem; Debug build; proj: .../Development/fastparse/toto; out: .../Development/fastparse/toto [SuccessX]