Re: [LAU] [Jack-Devel] jack2 turned verbose - Linux-audio-user

1 Jun 2012

On Fri, Jun 1, 2012 at 4:21 PM, Nedko Arnaudov wrote:
...
  David Adler writes:
  On Fri, Jun 1, 2012 at 2:52 PM, Robin Gareus
wrote:

 It might have to do with Arch's compiler[-flags] and how jack2 uses
 unions .. or scoping: JackGlobals vs Engine-Parameters.. although I
 don't have an explanation.. all seems good. 
 Compiler flags (for 32bit) are, (from unaltered /etc/makepkg.conf):
 CXXFLAGS="-march=i686 -mtune=generic -O2 -pipe -fstack-protector
 --param=ssp-buffer-size=4 -D_FORTIFY_SOURCE=2" 
 Don't use -O2 nor -O1, use -O0
 I'm aware of at least one *compiler* bug that causes jackdbus to
 misbehave. Yes, i analyzed the generated assembly. Affected are both
 i32 and amd64 targets. Atm the only reports are from Arch users. The bad
 machine code is created for th control api implementation, in parts that
 use unions (jack parameter values). 
Symptoms disappear when using -fpermissive and/or -O0 (instead of -O2),
with no changes in the source files.
So is this then an upstream or a downstream issue?
Nedko, does your advice to use -O0 only concern Jack or everything?
I'm compiling lots of software here, usually -O2 usually doesn't seem
to cause problems.
best,
david