Nested functions lead to linker error

[fxcoudert]

Reduced from gcc.c-torture/execute/nestfunc-2.c, a number of other test cases with nested functions are failing in similar ways:

$ cat nestfunc-2.c 
int foo (int (* fp)(int)) { return fp (0); }

int main (void)
{
  int nested (int a) { return 0; }
  return foo (nested);
}
$ ./bin/gcc nestfunc-2.c -O0     
ld: unexpected bindingNone in '_main' from /var/folders/5b/7mrgq6j55b51p7ztj1r3gv400000gq/T//ccNfwyoJ.o for architecture arm64
collect2: error: ld returned 1 exit status

Assembly produced:

	.arch armv8-a
	.text
	.align	2
	.globl _foo
_foo:
LFB0:
	.cfi_startproc
	stp	x29, x30, [sp, -32]!
	.cfi_def_cfa_offset 32
	.cfi_offset 29, -32
	.cfi_offset 30, -24
	mov	x29, sp
	str	x0, [sp, 24]
	ldr	x1, [sp, 24]
	mov	w0, 0
	blr	x1
	ldp	x29, x30, [sp], 32
	.cfi_restore 30
	.cfi_restore 29
	.cfi_def_cfa_offset 0
	ret
	.cfi_endproc
LFE0:
	.align	2
_nested.0:
LFB2:
	.cfi_startproc
	sub	sp, sp, #16
	.cfi_def_cfa_offset 16
	str	w0, [sp, 12]
	str	x18, [sp]
	mov	w0, 0
	add	sp, sp, 16
	.cfi_def_cfa_offset 0
	ret
	.cfi_endproc
LFE2:
	.align	3
LTRAMP0:
	hint	34 // bti c
	ldr	x17, .+20
	ldr	x18, .+24
	br	x17
	dsb	sy
	isb
	.xword	0
	.xword	0
	.align	2
	.globl _main
_main:
LFB1:
	.cfi_startproc
	stp	x29, x30, [sp, -64]!
	.cfi_def_cfa_offset 64
	.cfi_offset 29, -64
	.cfi_offset 30, -56
	mov	x29, sp
	add	x0, sp, 64
	str	x0, [sp, 56]
	add	x0, sp, 16
	add	x5, sp, 16
	adrp	x1, LTRAMP0@GOTPAGE
	ldr	x2, [x1, LTRAMP0@GOTPAGEOFF];momd
	mov	x1, x0
	mov	x4, x2
	ldp	x2, x3, [x4]
	stp	x2, x3, [x1]
	ldr	x2, [x4, 16]
	str	x2, [x1, 16]
	adrp	x1, _nested.0@PAGE
	add	x1, x1, _nested.0@PAGEOFF;momd
	str	x1, [x0, 24]
	str	x5, [x0, 32]
	add	x1, x0, 40
	bl	___clear_cache
	add	x0, sp, 16
	bl	_foo
	ldp	x29, x30, [sp], 64
	.cfi_restore 30
	.cfi_restore 29
	.cfi_def_cfa_offset 0
	ret
	.cfi_endproc
LFE1:
	.ident	"GCC: (GNU) 11.0.0 20200829 (experimental)"
	.subsections_via_symbols

[fxcoudert]

This may be the same root issue as #11 but with different symptoms.

[iains]

indeed seems to be fixed by
9a40d27