Re: nasty link problem with Gfortran and G++ (C++) ???

Lynn McGuire <lynnmcguire5@gmail.com> schrieb:

I found and fixed the problem with my code along with one of my
programmers.  I was not properly handling the size_t hidden argument
length value that GFortran adds to the character string arguments in my
C++ code.  Things are going better now.

Good to hear that.

Another thing that works well for gcc is to link everything with
the -flto option.

An example:

$ cat main.f90
program memain
  character *1 c
  call foo(c)
  print *,c
end
$ cat foo.c
void foo_(char *c)
{
  *c = 'A';
}
$ gfortran -flto  main.f90 foo.c
main.f90:3:13: warning: type of 'foo' does not match original declaration [-Wlto-type-mismatch]
    3 |   call foo(c)
      |             ^
foo.c:1:6: note: type mismatch in parameter 2
    1 | void foo_(char *c)
      |      ^
foo.c:1:6: note: type 'void' should match type 'long int'
foo.c:1:6: note: 'foo_' was previously declared here