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To summarize
sizeof(void) is not allowed in c++
1 is returned in c

4

max@kearny ~/tmp $ cat test.cc
#include <iostream>

using namespace std;

int main() {
cout << sizeof(void) << endl;
return 0;
}
max@kearny ~/tmp $ g++ -o test test.cc
test.cc: In function ‘int main()’:
test.cc:6: error: invalid application of ‘sizeof’ to a void type
max@kearny ~/tmp $

sizeof() is not defined for void type

When I compiled it on GCC, I got it sizeof(void) as 1 ...

Even I got 1 as ouput.

sizeof(void) is 'Illigal sizeof operand' on Windows

And, Dec 19, 2010 comments of Annonyms are correct on Unix

ERROR:not an allowed type

on borland c compiler

I think there is no point of having sizeof defined for void.

main()
{
printf("%d",sizeof(void));
}
o/p is 1.

void means "type" information for any variable is un-known. and result of calling sizeof() operator for unknown types is un-defined. No matter what compiler returns ( error or 1 ) it should return in error. ( hopefully compile time).