Bug with functions as parameters?

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2 total messages Started by Gene Spafford Wed, 05 Oct 1988 18:13

#1752

Author: Gene Spafford
Date: Wed, 05 Oct 1988 18:13

44 lines
1372 bytes

Index: 
    gcc 1.28 on a Sun 3/50, 3/60, 3/280 all running 3.4 SunOS

Source to reproduce problem:
	#include <stdio.h>

	int bar ()
	{
	   printf("hi!\n");
	}

	void foo (x)
	int x ();
	{
	  x();
	}

	int main()

	{
	   foo(bar);
	}

As I understand both K&R C and the new draft, this program should
not compile because the declaration of "int x ()" should conflict
with the parameter "x" provided as an argument.

Sun "cc" correctly flags this as an error, but gcc does not.

(The correct declaration should be "int (*x) ();" )

Script:
	Script started on Wed Oct  5 13:06:05 1988
	uther(96)> cc bogus.c
	"bogus.c", line 9: x declared as parameter to non-function
	"bogus.c", line 9: warning: a function is declared as an argument
	uther(97)> gcc -traditional bogus.c
	uther(98)> gcc -ansi bogus.c
	uther(99)> gcc -pedantic bogus.c
	uther(100)> ./a.out
	hi!
	uther(101)> ^D

	script done on Wed Oct  5 13:06:53 1988

Re: Bug with functions as parameters?

#1753

Author: Dave Hanson
Date: Wed, 05 Oct 1988 22:22

22 lines
1293 bytes

In article <8810051813.AA01101@uther.cs.purdue.edu> spaf@PURDUE.EDU (Gene Spafford) writes:
>Index: 
>    gcc 1.28 on a Sun 3/50, 3/60, 3/280 all running 3.4 SunOS
>
>Source to reproduce problem:

	int bar () { printf("hi!\n"); }
	void foo (x) int x (); { x(); }
	int main() { foo(bar);}

	As I understand both K&R C and the new draft, this program should
	not compile because the declaration of "int x ()" should conflict
	with the parameter "x" provided as an argument.

not quite. foo is defined in `old-style' and hence there's no argument
checking done for calls to foo like the foo(bar).

also, the type of argument x is automatically converted from
`int function' to  `pointer to int function' as stipulated at the
top of p. 218 in K&R2.

hence, there are no errors.

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