[LLVMdev] LLVM's Link Time Optimizer integrated into GNU ld

[Chandler Carruth]

Hello again,

I've put together a new patch. This is cleaned up some from the previous one
with feedback from some GCC/toolchain people to get the formatting correct.
I also removed some of the debugging output that was previously included,
and removed the configure and Makefile.in changes. Instead please follow the
below instructions for building.

http://code.chandlerc.net/binutils/binutils.trim.2007.01.06.patch

cd ${BINUTILS_SRC_ROOT}/ld
automake -ic
autoconf
cd ${BINUTILS_OBJ_ROOT}
${BINUTILS_SRC_ROOT}/configure --prefix=${BINUTILS_INSTALL_PATH}
--with-llvm=${LLVM_INSTALL_PATH}
make
make install

I hope this helps people who are interested in reviewing the patch as well
as applying it, and cleans up the output for people applying the patch.

-Chandler Carruth

On 1/7/07, Chandler Carruth <chandlerc at gmail.com> wrote:
>
> Hello,
>
> I have a very early version of GNU's ld, part of GNU binutils, with LLVM's
> Link Time Optimization integrated with it. This allows the linker to link
> LLVM bytecode and native objects together into a single executable. It is
> still very early in development, and I'll be working on doing more robust
> testing on it in the upcoming weeks, but it at least handles simple cases.
> If you are interested in trying it out, and providing feedback on how it
> performs, especially on some other platforms (mine is amd64-linux), I would
> be very interested.
>
> If you are interested in trying this, please pick up the patches to LLVM
> from bugs #1055 and #1073, as they are necessary to build LLVM's LTO
> suitable to link into binutils. The should be in LLVM's CVS soon, but aren't
> yet.
>
> Then use the following monolithic patch from the binutils CVS. It is
> monolithic only because binutils includes the verbatim, and automatically
> generated configure and Makefile.in scripts. The changes are actually
> quite small, and should (hopefully) apply cleanly, even as the CVS moves --
> the files changed for this process are among the least frequently changing
> in binutils development.
> http://code.chandlerc.net/binutils/binutils-tot.2007.01.06.patch
>
> *or*
>
> Grab a branch of this bzr repository of binutils. I will try and sync it
> to CVS every week or so, but it shouldn't be an issue for most people. It
> will allow actually tinkering with the implementation in a nice DRCS manner.
>
> http://code.chandlerc.net/binutils/bzr
>
> Finally, configure and build binutils similar to the following
>
> cd ${BINUTILS_OBJ_ROOT}
> ${BINUTILS_SRC_ROOT}/configure --prefix=${BINUTILS_INSTALL_PATH}
> --with-llvm=${LLVM_INSTALL_PATH}
> make
> make install
>
> where LLVM_INSTALL_PATH is equivalent to the prefix provided LLVM when it
> was configured and built. If 'llvm-config' is in your path, then simply
> specifying '--with-llvm' may be sufficient, but i haven't tested that
> behavior.
>
>
> Please, comments, suggestions, questions, and bugs are all welcome, and
> hopefully this will grow to be a very usable tool.
> -Chandler Carruth
>
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