[gnutls-devel] GnuTLS | MSVC problem with gen-getopt.py (#1337)

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Gisle Vanem created an issue: https://gitlab.com/gnutls/gnutls/-/issues/1337



Two of generated .h-files in `./src` does not work with MSVC;
`certtool-options.h` and `psktool-options.h`:
```
psktool-options.h(55): error C2016: C requires that a struct or union have at least one member
```
I.e. for this code:
```c
  /* Option enablement status */
  struct
  {

  } enabled;
```

A fix for was to modify `gen-getopt.py` to insert some `int dummy;` statements for such empty lists:
```
--- a/src/gen-getopt.py 2022-03-15 14:39:36
+++ b/src/gen-getopt.py 2022-03-13 16:34:15
@@ -501,7 +501,7 @@
     global_name = f'{mangle(prog_name)}Options'
     list_struct_name = f'{mangle(prog_name)}_list'

-    for i, option in enumerate(options):
+    for option in options:
         long_opt = option['long-option']
         arg_type = option.get('arg-type')
         lower_opt = mangle(long_opt)
@@ -528,8 +528,6 @@
                     f'{global_name}.list.{lower_opt}.args\n'
                 ))
             else:
-                if i == 0:
-                   struct_members_list.write (f'{INDENT*2}int dummy;\n')
                 struct_members_arg.write(
                     f'{INDENT*2}const char *{lower_opt};\n'
                 )
@@ -546,8 +544,6 @@
                 f'#define ENABLED_OPT_{upper_opt} '
                 f'{global_name}.enabled.{lower_opt}\n'
             ))
-        elif i == 0:
-            struct_members_enabled.write (f'{INDENT*2}int dummy;\n')

         have_opts.write((
             f'#define HAVE_OPT_{upper_opt} '
``` 

But I'm not sure how a proper fix would look like.

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