many -Wincompatible-pointer-types on clang with gdb-7.9

[Pedro Alves]

On 02/27/2015 06:55 PM, Jack Howarth wrote:
> On gdb-7.9, we are seeing a large number of warnings from
> -Wincompatible-pointer-types with clang...
> 
> ./guile/guile.c:474:25: warning: incompatible pointer types
> initializing 'scm_t_subr' (aka 'void (*)()') with an expression of
> type 'SCM (SCM, SCM)'
>       [-Wincompatible-pointer-types]
>   { "execute", 1, 0, 1, gdbscm_execute_gdb_command,
>                         ^~~~~~~~~~~~~~~~~~~~~~~~~~
> ./guile/guile.c:487:32: warning: incompatible pointer types
> initializing 'scm_t_subr' (aka 'void (*)()') with an expression of
> type 'SCM (void)'
>       [-Wincompatible-pointer-types]
>   { "data-directory", 0, 0, 0, gdbscm_data_directory,
>                                ^~~~~~~~~~~~~~~~~~~~~
> ./guile/guile.c:491:38: warning: incompatible pointer types
> initializing 'scm_t_subr' (aka 'void (*)()') with an expression of
> type 'SCM (void)'
>       [-Wincompatible-pointer-types]
>   { "guile-data-directory", 0, 0, 0, gdbscm_guile_data_directory,
>                                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> These all are associated with the guile/scm-*.c files.
>            Jack
> 

Curious.  I see that on C++ mode too.

I've attached my current patch to address this.  I think you'll
just need to do something like this on top:

 #else

 /* In C, just do an implicit conversion.  */
 -#define as_a_scm_t_subr(func) func
 +#define as_a_scm_t_subr(func) (scm_t_subr) func

 #endif


Did guile change the type of scm_t_subr again?
Here it says 'void (*)()' :

> initializing 'scm_t_subr' (aka 'void (*)()') with an expression of
> type 'SCM (SCM, SCM)'

On my copy (guile 2.0, Fedora 20), in
/usr/include/guile/2.0/libguile/__scm.h, I see:

#ifdef BUILDING_LIBGUILE
typedef SCM (* scm_t_subr) ();
#else
typedef void *scm_t_subr;
#endif

Thanks,
Pedro Alves

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