[Synfig-devl] [ synfig-Bugs-1509627 ] Rendering broken when compiling with g++ 4.1.1/4.2

SourceForge Headquarters 225 Broadway Suite 1600 San Diego, CA 92101 +1 (858) 454-5900

Bugs item #1509627, was opened at 2006-06-21 01:06
Message generated for change (Settings changed) made by dooglus
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=757416&aid=1509627&group_id=144022

Please note that this message will contain a full copy of the comment thread,
including the initial issue submission, for this request,
not just the latest update.
Category: None
Group: None
Status: Open
Resolution: None
Priority: 3
Private: No
Submitted By: FishB8 (fishb8)
>Assigned to: Nobody/Anonymous (nobody)
Summary: Rendering broken when compiling with g++ 4.1.1/4.2

Initial Comment:
I just recently had to rebuild my whole system after
moving from gcc3.4 to gcc4.1.

Anyway, in the process I also updated libpng to the
latest: 1.2.10  During the rebuild of synfig some of
the icons were not created correctly and I suspect this
was due to the libpng update, although I can't be certain.

All the png icons/images were created however, some of
them are invisible and others are black.

If somebody else can build against libpng 1.2.10
without problems then we can confirm the problem is
elsewhere. Until then, that seems like the most likey
suspect since several other programs have had problems
with the newer libpng. (Apparently there were some
small API changes)

----------------------------------------------------------------------

Comment By: dooglus (dooglus)
Date: 2007-09-27 12:45

Message:
Logged In: YES 
user_id=1546005
Originator: NO

I wouldn't say this was fixed.  It is still possible to specify the
optimization level when running ./configure, and doing so will still result
in a non-functional program.

Can't we find out what's going wrong exactly and fix it or work around it?

----------------------------------------------------------------------

Comment By: Robert B. Quattlebaum, Jr. (darco)
Date: 2006-08-30 22:42

Message:
Logged In: YES 
user_id=206661

>From what I can tell, this appears to actually be an issue when synfig is
built 
with optimization. When I built synfig-core on FC5 (GCC41), I got the 
behavior you described above. However, configuring with the option "--
enable-optimization=1" (the default optimization level is 2), the problem

seems to go away.

The problem has NOTHING to do with the rendering, and everything to do 
with the loading of the composition! ie: The problem is that for some
reason, 
the vector parsing function in loadcanvas.cpp is completely broken when 
compiled with -O2. 

I have changed the default optimization level on synfig-core on subversion
to 
be 1 instead of 2 until this issue is resolved.

----------------------------------------------------------------------

Comment By: Paul Wise (pabs3)
Date: 2006-07-11 20:49

Message:
Logged In: YES 
user_id=35028

Still doesn't work with g++ 4.1.1 (SVN 20060708). g++ 4.2 (SVN trunk
20060709) also does not work.

----------------------------------------------------------------------

Comment By: FishB8 (fishb8)
Date: 2006-06-23 17:47

Message:
Logged In: YES 
user_id=1231015

I was previously using libpng 1.2.9.

Some apps (for instance ImageMagick) would fail with the new
png libs, so I figured it would be first suspect. There were
no gcc warnings, but I wasn't sure if I would see any since
gcc itself is not generating the images.

Order of changes was:
-Recompile core system (including libpng) with gcc4.1
-Recompile Synfig

Not all the png images get screwed up, just about half of them.

I will try building with 4.0 to see if that fixes it.

Thanks for looking into it.

----------------------------------------------------------------------

Comment By: Paul Wise (pabs3)
Date: 2006-06-23 04:43

Message:
Logged In: YES 
user_id=35028

AHA!

I know what the problem is. synfig rendering is completely broken when
compiled with GCC 4.1.1. Please compile with 4.0 for now, until we figure
out what the problem is.

----------------------------------------------------------------------

Comment By: Paul Wise (pabs3)
Date: 2006-06-22 11:24

Message:
Logged In: YES 
user_id=35028

In addition to glennp's questions - hi glenn, thanks for helping :D

Was this the order of events?

libpng update
synfig recompile
png errors noticed

Did you get any GCC warnings when building synfig with the new libpng? Can
you check the API changes and synfig's png module to see if the changes are
relevant to synfig?

glen: 1.2.8 works fine on my debian sid system.

----------------------------------------------------------------------

Comment By: Glenn Randers-Pehrson (glennrp)
Date: 2006-06-21 15:21

Message:
Logged In: YES 
user_id=7859

Can you provide a sample bad PNG?
What libpng version were you using previously?

Glenn

----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=757416&aid=1509627&group_id=144022