[Bug c++/14563] octave built under Cygwin very slow

[paulthomas2 at wanadoo dot fr]

------- Additional Comments From paulthomas2 at wanadoo dot fr  2004-03-25 14:25 -------
Subject: Re:  octave built under Cygwin very slow

Danny and Wolfgang,

It seems that I was a bit too quick off the mark just now - thanks Ben!

So, the obvious question is how to do a build with sjlj disabled that is 
consistent with the way in which octave handles exceptions.  Does 
-disable-sjlj-exceptions do it without throwing up unrequited references 
during the linking?

Just to satisfy my curiosity and I would think, Ben's, just what is sjlj 
(baby-talk, please) and is this yet another thing that I should know and 
care about?

Paul T

Ben Diedrich wrote:

>Paul Thomas wrote:
>
>  
>
>>Danny,
>>
>>I am away from base right now and do not have access to any of the
>>installations - Ben Diedrich can supply you with the version number for
>>the "good" gcc; ie. that of the octave-forge binary distribution.  For
>>your information, Ben tells me  that the slow build, with profiling,
>>runs slightly more than three times more slowly than the fast build with
>>profiling.  Since the only significant difference in the profiles is the
>>presence in the slow build of sjlj calls,..... j'accuse!  Otherwise, the
>>problem must lie in something outside the scope of the profiling.
>>
>>If "W" does not automatically get this, could you ensure that it is
>>forwarded to him, please?
>>
>>Paul Thomas
>>
>>PS Thank you both for your rapid responses to this problem; it is
>>something that has been perplexing us a lot.
>>    
>>
>
>Here are the results of 'gcc -v' for the compiler that results in a fast octave. Note that it includes the
>option '--disable-sjlj-exceptions'.
>
>$ gcc -v
>Reading specs from /usr/lib/gcc-lib/i686-pc-cygwin/3.2/specs
>Configured with: /netrel/src/gcc-3.2-3/configure --enable-languages=c,c++,f77,java --enable-libgcj
>--enable-threads=posix --with-system-zlib --enable-nls --without-included-gettext --enable-interpreter
>--disable-sjlj-exceptions --disable-version-specific-runtime-libs --enable-shared --build=i686-pc-linux
>--host=i686-pc-cygwin --target=i686-pc-cygwin --enable-haifa --prefix=/usr --exec-prefix=/usr
>--sysconfdir=/etc --libdir=/usr/lib --includedir=/nonexistent/include --libexecdir=/usr/sbin
>Thread model: posix
>gcc version 3.2 20020927 (prerelease)
>
>Here are the results for the compiler that gives a slower octave. I noticed that this one has the option
>'--enable-sjlj-exceptions':
>
>$ gcc -v
>Reading specs from /usr/lib/gcc-lib/i686-pc-cygwin/3.3.1/specs
>Configured with: /GCC/gcc-3.3.1-3/configure --with-gcc --with-gnu-ld --with-gnu-as --prefix=/usr
>--exec-prefix=/usr --sysconfdir=/etc --libdir=/usr/lib --libexecdir=/usr/sbin --mandir=/usr/share/man
>--infodir=/usr/share/info --enable-languages=c,ada,c++,f77,pascal,java,objc --enable-libgcj
>--enable-threads=posix --with-system-zlib --enable-nls --without-included-gettext --enable-interpreter
>--enable-sjlj-exceptions --disable-version-specific-runtime-libs --enable-shared --disable-win32-registry
>--enable-java-gc=boehm --disable-hash-synchronization --verbose --target=i686-pc-cygwin
>--host=i686-pc-cygwin --build=i686-pc-cygwin
>Thread model: posix
>gcc version 3.3.1 (cygming special)
>
>Ben
>
>
>
>
>  
>




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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14563