c++ code executes very slowly - sjlj EH to blame?

Wed Dec 22 10:31:00 GMT 2004

Hi Bill,
Here's what I did to build gcc-3.4.3 with dwarf2 EH:
First, get the gcc sources (duh) and Danny Smith's
patch to support dwarf2 EH on cygwin:
http://gcc.gnu.org/ml/gcc-patches/2004-11/msg01989.html
The patch is meant for gcc-4.0 but it worked for me on
3.4.3.
 % cd /
 % mkdir install
 % rm -rf install/gcc-3.4.3
 % mkdir install/gcc-3.4.3
 % cd /usr/src
 % bzip2 -cd ... # unpack gcc sources
 % cd gcc-3.4.3
 % patch -p1 < ../cygming-dwarf2-eh.patch
 % cd ..
 % rm -rf obj
 % mkdir obj
 % cd obj
 % ../gcc-3.4.3/configure \
 --verbose --prefix=/usr --exec-prefix=/usr \
 --sysconfdir=/etc --libdir=/usr/lib \
 --libexecdir=/usr/lib --mandir=/usr/share/man \
 --infodir=/usr/share/info \
 --enable-languages=c,c++ --enable-nls \
 --without-included-gettext --enable-libgcj \
 --with-system-zlib --enable-interpreter \
 --enable-threads=posix --disable-sjlj-exceptions \
 --disable-version-specific-runtime-libs \
 --disable-win32-registry
 % make bootstrap
 % make install
About the gcc configuration -- all I did was take the
configuration from the gcc-3.4.1/cygwin (gcc -v), and
replace --enable-sjlj-exceptions with
--disable-sjlj-exceptions.
A good idea is to make a tarball from your build -
that's easy, just do this after you do make install:
 % make DESTDIR=/install/gcc-3.4.3 install
Then make a tarball, and put it in a safe place for
re-use/distribution.
I hope this helps.
-Adam
 --- Bill Priest <priestwilliaml@yahoo.com> wrote: 
> >Thanks Danny for helping me build gcc/g++ with
> dwarf2
> >EH. Performance of my app is now on par with linux
> -
> >where before it was about 3x slower (not 6x as I
> >previously reported... sorry for the confusion).
>> Any chance you could provide patches to the standard
> cygwin build scripts or gcc source if required or at
> a minimum the write-up required to make it work. 
> I've
> recently hit C++ problems w/ cygwin where the
> exception handling didn't work like it does w/ Linux
> (STL_port). I'd like to be able to try the dwarf2
> EH
> to see if it fixes the problem.
>> TIA,
>> Bill

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