https://sourceware.org/bugzilla/show_bug.cgi?id=23244
--- Comment #2 from Sebastian Huber <sebastian.hu...@embedded-brains.de> ---
Thanks for your analysis.
Calling a weakly undefined function is undefined behaviour. Would it be
possible to replace the call to zero with a call to the current PC (infinite
loop) or a nop?
On the ARM architecture it looks like a nop is created:
.type _start, %function
_start:
@ args = 0, pretend = 0, frame = 0
@ frame_needed = 0, uses_anonymous_args = 0
push {r3, lr}
movw r3, #:lower16:f
movt r3, #:upper16:f
cbz r3, .L1
bl f
bl f
.L1:
pop {r3, pc}
.size _start, .-_start
.weak f
Final executable code (Thumb-2):
Disassembly of section .text:
90000000 <_start>:
90000000: b508 push {r3, lr}
90000002: f240 0300 movw r3, #0
90000006: f2c0 0300 movt r3, #0
9000000a: b11b cbz r3, 90000014 <_start+0x14>
9000000c: f3af 8000 nop.w
90000010: f3af 8000 nop.w
90000014: bd08 pop {r3, pc}
90000016: bf00 nop
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