Re: [linux-audio-dev] [ANN] swh plugins release

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Subject: Re: [linux-audio-dev] [ANN] swh plugins release
From: Joern Nettingsmeier (nettings_AT_folkwang-hochschule.de)
Date: Wed Dec 03 2003 - 11:42:40 EET

Steve Harris wrote:
> On Wed, Dec 03, 2003 at 09:41:30AM +0100, Joern Nettingsmeier wrote:
>
>>builds fine, except for those warnings:
>>
>>ladspa-util.h: In function `f_trunc':
>>ladspa-util.h:110: warning: dereferencing type-punned pointer will break
>>strict-aliasing rules
>
>
> Very true, but I dont think I asked to compiler to use strict aliasing,
> can you send an example gcc line make spits out? I've checked a fix into
> CVS that should stop alising for most people anyway.

gcc -DHAVE_CONFIG_H -I. -I. -I. -g -O2 -Wall -O6
-fomit-frame-pointer -fstrength-reduce -funroll-loops
-fmove-all-movables -ffast-math -fPIC -DPIC -mcpu=i686 -march=i686 -c
imp_1199.so.c
In file included from imp_1199.xml:37:
ladspa-util.h: In function `f_trunc':
ladspa-util.h:110: warning: dereferencing type-punned pointer will break
strict-aliasing rules

> Anyone know why some gcc's check for aliasing?
>
>
>>however, when i use --enable-sse, gcc falls apart:
>
>
> Oops. Yes, that a known problem, but I think the README file is a bit
> misleading - its supposed to be hinting that you should build FFTW with
> --enable-sse, not the plugins. gcc's automatic SSE support is not very
> good (which is all it enables IIRC), and used to produce worse code.

so i can safely use --enable-sse with fftw, when it produces an internal
compiler error with swh-plugins???

> If your gcc is new enough it might ne better, i'd be happy to hear if it
> is. I'l change the README.

# gcc -v
Reading specs from /usr/lib/gcc-lib/i586-suse-linux/3.3.1/specs
Configured with: ../configure --enable-threads=posix --prefix=/usr
--with-local-prefix=/usr/local --infodir=/usr/share/info
--mandir=/usr/share/man --libdir=/usr/lib
--enable-languages=c,c++,f77,objc,java,ada --disable-checking
--enable-libgcj --with-gxx-include-dir=/usr/include/g++
--with-slibdir=/lib --with-system-zlib --enable-shared
--enable-__cxa_atexit i586-suse-linux
Thread model: posix
gcc version 3.3.1 (SuSE Linux) 

-- 
To someone whose only tool is a hammer, each problem looks like a nail.
	- Edsger W. Dijkstra, EWD838

Jörn Nettingsmeier
Kurfürstenstr 49, 45138 Essen, Germany
http://spunk.dnsalias.org (my server)
http://www.linuxaudiodev.org (Linux Audio Developers)

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