Counting all warnings,
there are 22 warnings in stage3 of this bootstrap.

Number of warnings per file:
   6 gcc/config/rs6000/altivec.md
   6 /usr/share/bison.simple
   5 gcc/gcc.c
   2 gcc/objc/lang-specs.h
   2 gcc/java/jcf-io.c
   1 gcc/java/jvspec.c

Number of warning types:
   4 operand 3 missing mode?
   4 old-style function definition
   2 operand 1 missing mode?
   2 comparison between signed and unsigned
   1 string length '844' is greater than the length '509' ISO C89 compilers are required to support
   1 string length '819' is greater than the length '509' ISO C89 compilers are required to support
   1 string length '783' is greater than the length '509' ISO C89 compilers are required to support
   1 string length '608' is greater than the length '509' ISO C89 compilers are required to support
   1 string length '603' is greater than the length '509' ISO C89 compilers are required to support
   1 string length '587' is greater than the length '509' ISO C89 compilers are required to support
   1 string length '2865' is greater than the length '509' ISO C89 compilers are required to support
   1 string length '1148' is greater than the length '509' ISO C89 compilers are required to support
   1 ISO C forbids passing argument 3 of 'scandir' between function pointer and 'void *'
   1 ISO C forbids conversion of function pointer to object pointer type