leaf functions are broken on SPARC

[Dan Nicolaescu]

GCC CVS does not generate leaf functions anymore on SPARC
(sparc-sun-solaris2.7):


void foo (void)
{
}


compiles to (with -O2):

        .file   "p.c"
        .section        ".text"
        .align 4
        .global foo
        .type   foo,#function
        .proc   020
foo:
        !#PROLOGUE# 0
        save    %sp, -112, %sp         <=== ???
        !#PROLOGUE# 1
        ret
        restore

This is a regression from 3.0.x
Is this a SPARC specific problem?