[bug #23681] Function declarators with empty parentheses should not be used

["Ludovic Courtès" <INVALID.NOREPLY@gnu.org>]

URL:
  <http://savannah.gnu.org/bugs/?23681>

                 Summary: Function declarators with empty parentheses should
not be used
                 Project: Guile
            Submitted by: civodul
            Submitted on: Monday 06/23/2008 at 11:45
                Category: None
                Severity: 4 - Important
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any

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Details:

Hello,

In Guile 1.8 and earlier, `scm_c_define_gsubr ()', `gh_new_procedure ()' and
related functions take a function pointer as an argument, where the function
type uses empty parentheses (which means that the function can have any
prototype, provided the return type matches).

Function declarators with empty parentheses are not available in C++ [0] and
are an obsolescent feature as of C99 (Section 6.11.6); it also break when
GCC's `-Wstrict-prototypes' option is used [1].  

Therefore, Guile's API should eventually (e.g., in the next major release) be
changed to use a different function pointer type.  Hopefully, the change can
be made almost transparent for applications that use `guile-snarf'.

Thanks,
Ludovic.

[0] http://article.gmane.org/gmane.lisp.guile.user/6613
[1] http://thread.gmane.org/gmane.comp.encryption.gpg.gnutls.devel/2118




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