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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Inspirels Ada on cortex tutorial linker issue
Date: Sat, 23 Jul 2016 17:32:06 +0100
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Date: 2016-07-23T17:32:06+01:00
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Devin <devin.inspiredby@gmail.com> writes:

> On Saturday, July 23, 2016 at 9:34:10 AM UTC+2, Devin wrote:
>> On Saturday, July 23, 2016 at 2:57:22 AM UTC-4, Simon Wright wrote:
>> > Devin writes:
>> > 
>> > > I am trying to get my environment setup, and I am using an Orange pi
>> > > pc running armbian as the OS.  It is an arm based single board
>> > > computer, so I should be able to use the compiler and linker tools
>> > > natively, at least that is what I am understanding from the chapter of
>> > > the tutorial.
>> > >
>> > > I am able to compile the program from the "First Program" chapter of
>> > > the tutorial without errors, but when I attempt to link the program I
>> > > get an error reading:
>> > >
>> > > program.o:(.ARM.exidx+0x0): undefined reference to
>> > > '__aeabi_unwind_cpp_pr0'

> Here is the output in my program.s:
>
> 	.cpu cortex-m0
> 	.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, 2
> 	.eabi_attribute 30, 6
> 	.eabi_attribute 34, 0
> 	.code	16
> 	.file	"program.adb"
> 	.global	program_E
> 	.data
> 	.align	1
> 	.type	program_E, %object
> 	.size	program_E, 2
> program_E:
> 	.space	2
> 	.text
> 	.align	2
> 	.global	run
> 	.code	16
> 	.thumb_func
> 	.type	run, %function
> run:
> 	.fnstart
> .LFB2:
> 	push	{r7, lr}
> 	.save {r7, lr}
> 	.setfp r7, sp, #0
> 	add	r7, sp, #0
> .L3:
> 	mov	r8, r8
> 	b	.L3
> 	.fnend
> 	.size	run, .-run
> 	.ident	"GCC: (Debian 4.9.2-1) 4.9.2"
> 	.section	.note.GNU-stack,"",%progbits

Strange. There's nothing in there to reference
__aeabi_unwind_cpp_pr0. Does "nm program.o" show a reference?

Umm, I suppose you did actually recompile the program to produce an
object file and it's not some old program.o left lying around?