Description of problem:
gcc compiler show false warning on correct code
actually this source compiled by g++ compiler from same toolchain with same command line keys don't display this warning.

Version-Release number of selected component (if applicable):
gcc (GCC) 4.6.1 20110908 (Red Hat 4.6.1-9)

How reproducible:
Compile source, attached to this bug with '-Wall' key.

Steps to Reproduce:
1. Compile source attached to this bug as listed below:
  
Actual results:
$ c99 -Wall test.c 
test.c: In function ‘main’:
test.c:8:5: warning: passing argument 1 of ‘foo’ from incompatible pointer type [enabled by default]
test.c:3:6: note: expected ‘const char * const*’ but argument is of type ‘char **’
$

Expected results:
$ c99 -Wall test.c 
$

Additional info:
$ c++ -Wall test.c 
$