aout support is still required for a few things (mainly for compiling
some boot blocks), but is broken in gcc3 for at least compile-time
assignments to long longs and shifts of long longs by a non-constant
amount:
%%%
$ cat z.c
long long x = 0;
int y;
foo()
{
x = x << y;
}
$ cc -O -S -aout z.c
$ cat z.s
.file "z.c"
.globl _x
.data
.p2align 3
.type _x,@object
.size _x,8
_x:
.quad 0
.text
.p2align 2,0x90
.globl _foo
.type _foo,@function
_foo:
pushl %ebp
movl %esp, %ebp
movb _y, %cl
movl _x, %eax
movl _x+4, %edx
shldl %eax, %edx
sall %cl, %eax
testl $32, %ecx
je L2
movl %eax, %edx
movl $0, %eax
L2:
movl %eax, _x
movl %edx, _x+4
leave
ret
Lfe1:
.size _foo,Lfe1-_foo
.comm _y,4
.ident "GCC: (GNU) 3.1 [FreeBSD] 20020509 (prerelease)"
%%%
The above assembler output has two syntax errors:
- ".quad 0". .quad is not supported by the old aout assembler.
- "shldl %eax, %edx". The old aout assembler only accepts the correct
syntax of "shldl %cl,%eax,%edx". Note that gcc doesn't elide the
similarly implicit %cl register for the sall instruction.
Bruce
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