Re: Inspirels Ada on cortex tutorial linker issue

[Devin <devin.inspiredby@gmail.com>]

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'
> > 
> > That's to do with exception handling. It seems that your armbian
> > compiler has inserted exception handling code that's not inserted by the
> > raspbian compiler. I'd expect some trace of this in the program.s file
> > described in the tutorial.
> > 
> > When I compile (using -S to generate program.s) with an arm-eabi
> > cross-compiler on this Mac, I get something that's almost the same as
> > the tutorial. When I compile with the native compiler, aside from the
> > obvious difference that it's x86_64 code, there is exception handling
> > code in there.
> > 
> > It's possible that this is because of different configuration options in
> > system.ads. Before we go too far down that route, can anyone report on
> > experience using raspbian/armbian?
> 
> Thanks for the info.  After looking closer, there are definitely differences in the output of my program.s file, so I think you may be on to something there.

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