[arm-gnu] [BUGREPORT] Invalid assembler generated

[Rafaël Carré <rafael.carre@xxxxxxxxx>]

Hello,

Compiler is gcc version 4.4.1 (Sourcery G++ Lite 2010q1-188)

Please consider this testcase (reduced from rockbox snake.c),
at -O level a label is referenced but not present from the assembler


% cat test.i
static int head = 0;

void _start (void) {
    char x, y;

    for (x = head; x < 2; x++) {
        y = x;
        switch (head) {
        case 0:
            y = 0;
        default:
            head = ++y;
        }
    }
}
% /usr/local/arm-2010q1/bin/arm-none-eabi-gcc -O test.i
/tmp/ccGWjXRm.o: In function `_start':
test.i:(.text+0x1c): undefined reference to `.L3'
collect2: ld returned 1 exit status
% /usr/local/arm-2010q1/bin/arm-none-eabi-gcc test.i   
% 

FSF gcc 4.4.4 arm-elf-eabi works fine.

I'm pasting the assembler output below:

	.cpu arm7tdmi
	.fpu softvfp
	.eabi_attribute 20, 1
	.eabi_attribute 21, 1
	.eabi_attribute 23, 3
	.eabi_attribute 24, 1
	.eabi_attribute 25, 1
	.eabi_attribute 26, 1
	.eabi_attribute 30, 1
	.eabi_attribute 18, 4
	.file	"snake-small.i"
	.text
	.align	2
	.global	_start
	.type	_start, %function
_start:
	@ Function supports interworking.
	@ args = 0, pretend = 0, frame = 0
	@ frame_needed = 0, uses_anonymous_args = 0
	@ link register save eliminated.
	ldr	r3, .L10
	ldr	r3, [r3, #0]
	mov	r2, r3
	cmp	r3, #1
	bxhi	lr
	mov	r1, #1
.L8:
	cmp	r3, #0
	bne	.L3
.L4:
	mov	r3, r1
	add	r2, r2, #1
	cmp	r2, #2
	bne	.L8
	ldr	r2, .L10
	str	r1, [r2, #0]
	bx	lr
.L11:
	.align	2
.L10:
	.word	.LANCHOR0
	.size	_start, .-_start
	.bss
	.align	2
	.set	.LANCHOR0,. + 0
	.type	head, %object
	.size	head, 4
head:
	.space	4
	.ident	"GCC: (Sourcery G++ Lite 2010q1-188) 4.4.1"


-- 
✍ Rafaël Carré ☺

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