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Message-ID: <20041222103145.95154.qmail@web52506.mail.yahoo.com>
Date: Wed, 22 Dec 2004 05:31:45 -0500 (EST)
From: Adam McKee <adam_m_mckee AT yahoo DOT ca>
Subject: Re: c++ code executes very slowly - sjlj EH to blame?
To: Bill Priest <priestwilliaml AT yahoo DOT com>, cygwin AT cygwin DOT com
In-Reply-To: <20041221120619.49379.qmail@web20825.mail.yahoo.com>
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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 AT yahoo DOT 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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