On 11/7/19 2:41 PM, Jozef Lawrynowicz wrote:
> Support for the MSP430 -minrt option has been removed from Newlib, since all
> the
> associated behaviour is now dynamic. Initialization code run before main is
> only
> included when needed.
>
> This patch removes the final traces of -minrt from GCC.
>
> -minrt used to modify the linking process in the following ways:
> * Removing .init and .fini sections, by using a reduced crt0 and excluding
> crtn.
> * Removing crtbegin and crtend (thereby not using crtstuff.c at all).
> + This meant that even if the program had constructors for global or
> static objects which must run before main, it would blindly remove them.
>
> These causes of code bloat have been addressed by:
> * switching to .{init,fini}_array instead of using .{init,fini} sections
> "Lean" code to run through constructors before main is only included if
> .init_array has contents.
> * removing bloat (frame_dummy, *tm_clones*, *do_global_dtors*) from the
> crtstuff.c with the changes in the previous patches
>
> Here are some examples of the total size of different "barebones" C programs
> to
> show that the size previously achieved by -minrt is now matched by default:
>
> program |old (with -minrt) |new (without -minrt)
> ---------------------------------------------------------------------
> Empty main |20 |20
> Looping main |14 |14
> Looping main with data |94 |94
> Looping main with bss |56 |56
>
>
> 0004-MSP430-Remove-minrt-option.patch
>
> From 6e561b45c118540f06d5828ec386d2dd79c13b62 Mon Sep 17 00:00:00 2001
> From: Jozef Lawrynowicz <joze...@mittosystems.com>
> Date: Wed, 6 Nov 2019 18:12:45 +0000
> Subject: [PATCH 4/4] MSP430: Remove -minrt option
>
> gcc/ChangeLog:
>
> 2019-11-07 Jozef Lawrynowicz <joze...@mittosystems.com>
>
> * config/msp430/msp430.h (STARTFILE_SPEC): Remove -minrt rules.
> Use "if, then, else" syntax for specs.
> (ENDFILE_SPEC): Likewise.
> * config/msp430/msp430.opt: Mark -minrt as deprecated.
> * doc/invoke.texi: Remove -minrt documentation.
This is fine. I leave the decision whether or not to install now or
wait for resolution on the other changes in this space as your decision.
jeff
