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

On 1/14/2025 12:42 PM, Thomas Koenig wrote:

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

>
I will try it.