We are nesting functions now?

We are nesting functions now?

[Matt Young]

/* This seems to work */
int  main() {
        void fi() {
                void f2() {
                        printf("F2\n");
                        }
                void f3() {
                        printf("F3\n");
                        f2();
                        }
                printf("F1\n");
                }
        fi();
        f3();
        return 1;
}

Re: We are nesting functions now?

[kwall]

Feigning erudition, Matt Young wrote:
% /* This seems to work */
% int  main() {
%         void fi() {
%                 void f2() {
%                         printf("F2\n");
%                         }
%                 void f3() {
%                         printf("F3\n");
%                         f2();
%                         }
%                 printf("F1\n");
%                 }
%         fi();
%         f3();
%         return 1;
% }

Please define "seems to work". After #including stdio.h,

[~/src]$ cc -Wall nest.c
nest.c: In function `main':
nest.c:15: warning: implicit declaration of function `f3'
/tmp/cc4UlMpa.o: In function `main':
/tmp/cc4UlMpa.o(.text+0x82): undefined reference to `f3'
collect2: ld returned 1 exit status
[~/src]$ gcc -v
Reading specs from /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.2/specs
Configured with: ../gcc-3.2/configure --enable-threads --enable-shared --enable-static --disable-nls --enable-languages=c,c++,g77,objective-c
Thread model: posix
gcc version 3.2

Kurt
-- 
Steinbach's Guideline for Systems Programming:
	Never test for an error condition you don't know how to
handle.

Re: We are nesting functions now?

[Timothy J. Wood]

   If you move the call to f3 so that it is in the proper scope, this 
works:

% cc -Wall foo.c -o foo
% ./foo
F1
F3
F2
% cc -v
cc -v
Reading specs from /usr/libexec/gcc/darwin/ppc/3.1/specs
Thread model: posix
Apple Computer, Inc. GCC version 1173, based on gcc version 3.1 
20020420 (prerelease)


#include <stdio.h>
int  main() {
     void fi() {
         void f2() {
             printf("F2\n");
         }
         void f3() {
             printf("F3\n");
             f2();
         }
         printf("F1\n");
         f3();
     }
     fi();
     return 1;
}

-tim

Re: We are nesting functions now?

[Kris Warkentin]

It's a gcc extension.  Probably in there for Pascal support.

http://gcc.gnu.org/onlinedocs/gcc-3.2/gcc/Nested-Functions.html#Nested%20Fun
ctions

cheers,

Kris
----- Original Message -----
From: "Timothy J. Wood" <tjw@omnigroup.com>
To: <kwall@kurtwerks.com>
Cc: "GCC List" <gcc@gnu.org>
Sent: Thursday, December 12, 2002 1:00 AM
Subject: Re: We are nesting functions now?


>
>
>    If you move the call to f3 so that it is in the proper scope, this
> works:
>
> % cc -Wall foo.c -o foo
> % ./foo
> F1
> F3
> F2
> % cc -v
> cc -v
> Reading specs from /usr/libexec/gcc/darwin/ppc/3.1/specs
> Thread model: posix
> Apple Computer, Inc. GCC version 1173, based on gcc version 3.1
> 20020420 (prerelease)
>
>
> #include <stdio.h>
> int  main() {
>      void fi() {
>          void f2() {
>              printf("F2\n");
>          }
>          void f3() {
>              printf("F3\n");
>              f2();
>          }
>          printf("F1\n");
>          f3();
>      }
>      fi();
>      return 1;
> }
>
> -tim
>
>

Re: We are nesting functions now?

[Paul Brook]

On Thursday 12 December 2002 1:57 pm, Kris Warkentin wrote:
> It's a gcc extension.  Probably in there for Pascal support.

Also used by the fortran frontends.

>
> http://gcc.gnu.org/onlinedocs/gcc-3.2/gcc/Nested-Functions.html#Nested%20
>Functions

Paul Brook