[Getdp] compiling pewe with fortran compiler

[blubee blubeeme]

Hello

I am trying to compile gmsh with flang:
https://github.com/flang-compiler/flang

I am failing with these errors:
F90-S-0038-Symbol, complex, has not been explicitly declared (besselh.f90)
F90-S-0038-Symbol, besjn, has not been explicitly declared (besselh.f90)
F90-S-0038-Symbol, besyn, has not been explicitly declared (besselh.f90)
  0 inform,   0 warnings,   3 severes, 0 fatal for besselh
F90-S-0038-Symbol, besjn, has not been explicitly declared (besselh.f90)
  0 inform,   0 warnings,   1 severes, 0 fatal for besselj_p
F90-S-0038-Symbol, besjn, has not been explicitly declared (besselh.f90)
  0 inform,   0 warnings,   1 severes, 0 fatal for besselj_pp

because they seem to be gnu specific fortran functions:
https://gcc.gnu.org/onlinedocs/gcc-4.1.2/gfortran/BESJN.html

Would it be possible to implement these functions in another way?

Best,
Owen
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