C/C++ difference in function arguments

[Munagala V. S. Ramanath]

Hi,

The following program:
------------------------------------------------------------------------
#include <stdio.h>

void
f( double const a[2][2] )
{
    printf( "%f\n", a[0][1] ); fflush( stdout );
}

int
main( int argc, char *argv[] )
{
    double a[2][2] = {{1,2},{3,4}};
    f( a );
    return 0;
}
------------------------------------------------------------------------

produces what seems to me to be a bogus warning when compiled
as a C program with egcs-1.0:

ram@dust tests: /d2a/exper/bin/gcc -ansi -pedantic -O2 -Wall -c bug4.c
bug4.c: In function `main':
bug4.c:13: warning: passing arg 1 of `f' from incompatible pointer type

The same program produces no warnings when compiled as a C++ program:

ram@dust tests: /d2a/exper/bin/gcc -ansi -pedantic -O2 -Wall -c bug4.C
ram@dust tests:

The files are identical:

ram@dust tests: diff bug4.[cC]
ram@dust tests: 

Gcc-2.7.2 did not exhibit this dichotomy.

(Removing the 'const' in the definition of f() makes the problem go
away but I'd prefer to leave the const in.)

Ram