Re: Build failure while experimenting with LTO

On Sun, Jun 26, 2016 at 6:50 PM, Davide Italiano <dccitaliano@gmail.com> wrote:
> On Sun, Jun 26, 2016 at 6:48 PM, Davide Italiano <dccitaliano@gmail.com> wrote:
> > Hi,
> > 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
> > CXX=~/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
> > /home/davide/lto_experiments/libreoffice/external/coinmp/ExternalPackage_coinmp.mk:31:
> > *** 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[1]: *** 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.
> >
> > Thanks!
> >
> > --
> > Davide
>
> Also, FWIW this is the revision I'm at:
>
> commit 63f15b36f7a196edb20ce7a0aba6f6b3d28dd652
> Author: Ashod Nakashian <ashod.nakashian@collabora.co.uk>
> Date:   Sun Jun 12 22:04:50 2016 -0400
>
> --
> Davide

I refreshed to:

commit 04136c95c5be30004e627f2866fe6ecea60a04f1
Author: Muhammet Kara <muhammet.kara@pardus.org.tr>
Date:   Fri Jun 17 15:24:19 2016 +0300

    Move accessibility relations to .ui files, Part 10: tdf#87026

$ ~/work/llvm/build-release/bin/clang --version
clang version 3.9.0 (trunk 273841) (llvm/trunk 273938)

$ ~/work/llvm/build-release/bin/clang++ --version
clang version 3.9.0 (trunk 273841) (llvm/trunk 273938)

clang is upstream clang + the patch for abi_attribute.

but the problem is still there :( BTW, I think this is related to
clang because I'm able to reproduce without LTO:

$ ./autogen.sh CC=~/work/llvm/build-release/bin/clang
CXX=~/work/llvm/build-release/bin/clang++ --enable-dbgutil
--without-java --without-help --without-myspell-dicts

[build EPK] fonts_carlito
[build EPK] fonts_dejavu
[build EPK] fonts_gentium
[build EPK] fonts_liberation
[build EPK] fonts_liberation_narrow
[build EPK] fonts_libertineg
[build EPK] fonts_opensans
[build EPK] fonts_ptserif
[build EPK] fonts_sourcecode
[build EPK] fonts_sourcesans
[build UPK] a8c2c5b8f09e7ede322d5c602ff6a4b6-mythes-1.2.4.tar.gz
[build MOD] poppler
/home/davide/lto_experiments/libreoffice/external/redland/ExternalPackage_raptor.mk:21:
*** file 
/home/davide/lto_experiments/libreoffice/workdir/UnpackedTarball/raptor/src/.libs/libraptor2-lo.so.0.0.0
does not exist in the tarball.  Stop.

Any ideas on how to debug this?

Thanks!

--
Davide