Re: Inspirels Ada on cortex tutorial linker issue

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

On Saturday, July 23, 2016 at 12:32:09 PM UTC-4, Simon Wright wrote:
> Devin 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?

Yes, after looking at the assembly, I recompiled using:
$ gcc -c -mcpu=cortex-m0 -mthumb -mfloat-abi=soft program.adb

From the looks of it, the exception handling is added at compile time when making the program.o file?  Would I be able to edit system.ads to turn off exception handling?