Build failure while experimenting with LTO
dccitaliano at gmail.com
Mon Jun 27 01:50:42 UTC 2016
On Sun, Jun 26, 2016 at 6:48 PM, Davide Italiano <dccitaliano at gmail.com> wrote:
> I'm experimenting a bit with LTO using clang and lld (the new LLVM linker).
> I'm able to build a decent fraction of libreoffice if I invoke
> autogen.sh like this:
> ./autogen.sh CC=~/work/llvm/build-release/bin/clang
> AR=~/work/llvm/build-release/bin/llvm-ar RANLIB=/usr/bin/true
> LDFLAGS="-fuse-ld=lld" CFLAGS="-flto" CXXFLAGS="-flto" --without-java
> --without-help --without-myspell-dicts --disable-liblangtag
> --with-system-curl --with-system-lcms2
> (please note that as long as I'm using the LLVM tools I don't need
> plugin(s) as binutils does).
> I set up my PATH so that ld symlinks to lld.
> $ ld --version
> LLD 3.9 (https://llvm.org/svn/llvm-project/lld/trunk 273771)
> After some librabries/executables are built/linked successfully I hit
> the following:
> [build DEP] LNK:Library/libbiblo.so
> [build LNK] Library/libbiblo.so
> *** file /home/davide/lto_experiments/libreoffice/workdir/UnpackedTarball/coinmp/Cbc/src/.libs/libCbc.so.3.8.8
> does not exist in the tarball. Stop.
> make: *** Waiting for unfinished jobs....
> Makefile:254: recipe for target 'build' failed
> make: *** [build] Error 2
> $ find . -name "libCbc.so*"
> So I decided to build libCbc by myself going in the correct directory
> and invoking make:
> $ cd ./workdir/UnpackedTarball/coinmp/Cbc/ && ./configure && make
> but still the build fails with the same error.
> Any ideas why the library is not built? Is this a bug in LLVM or in
> the build system?
> As a side note, I'm able to finish successfully a non-LTO build with clang+lld.
Also, FWIW this is the revision I'm at:
Author: Ashod Nakashian <ashod.nakashian at collabora.co.uk>
Date: Sun Jun 12 22:04:50 2016 -0400
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