From: Solomon Peachy via rockbox-dev <rockbox-dev_at_cool.haxx.se>
Date: Sun, 5 Jul 2020 13:48:32 -0400

Another update, this time with good news!

I'm writing this listening to music with a demo plugin running
simultaneously on a mini2g (PP502x) built using gcc 4.9.4 (see g#2305)

There turned out to be two major (and independent) problems:

 * arm corelock asm code was relying on constructs that, according to
   GCC docs, "cannot be depended upon to work reliably and are not
   supported".
 * An odd quirk in the linker script caused overlapping sections with
   binutils 2.21 or newer. (This overlap included things like various
   mutexes. Cue much badness..)

I've already committed fixes for these, and the pile of more minor
issues I've found along the way. No regressions noted using the old
tooling.

Now there are still many build warnings in code that wasn't previously
touched by the mips, native, and hosted 4.9.4-based builds. Many (if
not most) are triggered by using -Wextra and and a change of default
optimization from -O to -Os.

So. I'm not comfortable committing this toolchain bump without wider
testing of gcc494 builds on sh, m68k and various other native arm
targets (especially other portalplayer-based units!)

Any volunteers?

 - Solomon

-- 
Solomon Peachy			      pizza at shaftnet dot org (email&xmpp)
                                      _at_pizza:shaftnet dot org   (matrix)
High Springs, FL                      speachy (freenode)

Received on 2020-07-05