[Bug lto/47225] [4.6.0 regression]: cross-compile fails while configuring libgcc with "xgcc: fatal error: -fuse-linker-plugin, but liblto_plugin.so not found"

["John.Tytgat at aaug dot net" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47225

--- Comment #2 from John Tytgat <John.Tytgat at aaug dot net> 2011-01-08 18:22:14 UTC ---
I'm giving the --disable-shared configure option for building cross-compiler as
I'm not interested in shared target libraries and it looks like this is passed
on to lto-plugin which is only relevant for the host.  This is configure call
for lto-plugin:

--8<--
  $ /home/joty/projects/gccsdk/gccsdk_svn7/gcc4/srcdir/gcc/lto-plugin/configure
--cache-file=./config.cache --with-system-zlib --with-newlib
--prefix=/home/joty/projects/gccsdk/riscos7/cross
--with-gmp=/home/joty/projects/gccsdk/gccsdk_svn7/gcc4/builddir/installed-libs-for-cross-gcc
--with-mpfr=/home/joty/projects/gccsdk/gccsdk_svn7/gcc4/builddir/installed-libs-for-cross-gcc
--with-mpc=/home/joty/projects/gccsdk/gccsdk_svn7/gcc4/builddir/installed-libs-for-cross-gcc
--with-system-zlib
--with-ppl=/home/joty/projects/gccsdk/gccsdk_svn7/gcc4/builddir/installed-libs-for-cross-gcc
--with-host-libstdcxx=-Wl,-lstdc++
--with-cloog=/home/joty/projects/gccsdk/gccsdk_svn7/gcc4/builddir/installed-libs-for-cross-gcc
--enable-lto
--with-libelf=/home/joty/projects/gccsdk/gccsdk_svn7/gcc4/builddir/installed-libs-for-cross-gcc
--disable-threads --disable-multilib --disable-shared --with-newlib
--enable-interwork --disable-nls --disable-libquadmath
--enable-checking=release --enable-languages=c,c++,lto
--program-transform-name=s&^&arm-unknown-eabi-& --disable-option-checking
--build=x86_64-unknown-linux-gnu --host=x86_64-unknown-linux-gnu
--target=arm-unknown-eabi
--srcdir=/home/joty/projects/gccsdk/gccsdk_svn7/gcc4/srcdir/gcc/lto-plugin
--8<--

and the buildoutput for the lto-plugin part:

--8<--
make[4]: Entering directory
`/home/joty/projects/gccsdk/gccsdk_svn7/gcc4/builddir/cross-gcc/lto-plugin'
/bin/bash ./libtool --tag=CC --tag=disable-static  --mode=compile gcc
-DHAVE_CONFIG_H -I.
-I/home/joty/projects/gccsdk/gccsdk_svn7/gcc4/srcdir/gcc/lto-plugin 
-I/home/joty/projects/gccsdk/gccsdk_svn7/gcc4/srcdir/gcc/lto-plugin/../include
-DHAVE_CONFIG_H  -Wall -Werror -O0 -g -c -o lto-plugin.lo
/home/joty/projects/gccsdk/gccsdk_svn7/gcc4/srcdir/gcc/lto-plugin/lto-plugin.c
libtool: compile:  gcc -DHAVE_CONFIG_H -I.
-I/home/joty/projects/gccsdk/gccsdk_svn7/gcc4/srcdir/gcc/lto-plugin
-I/home/joty/projects/gccsdk/gccsdk_svn7/gcc4/srcdir/gcc/lto-plugin/../include
-DHAVE_CONFIG_H -Wall -Werror -O0 -g -c
/home/joty/projects/gccsdk/gccsdk_svn7/gcc4/srcdir/gcc/lto-plugin/lto-plugin.c
-o lto-plugin.o
/bin/bash ./libtool --tag=CC --tag=disable-static  --mode=link gcc -Wall
-Werror -O0 -g  -bindir
/home/joty/projects/gccsdk/riscos7/cross/libexec/gcc/arm-unknown-eabi/4.6.0  
-o liblto_plugin.la -rpath
/home/joty/projects/gccsdk/riscos7/cross/libexec/gcc/arm-unknown-eabi/4.6.0
lto-plugin.lo ../libiberty/pic/libiberty.a 

*** Warning: Linking the shared library liblto_plugin.la against the
*** static library ../libiberty/pic/libiberty.a is not portable!
libtool: link: ar rc .libs/liblto_plugin.a ../libiberty/pic/libiberty.a 
lto-plugin.o
libtool: link: ranlib .libs/liblto_plugin.a
libtool: link: ( cd ".libs" && rm -f "liblto_plugin.la" && ln -s
"../liblto_plugin.la" "liblto_plugin.la" )
/bin/bash ./libtool --tag=disable-static  --mode=install /usr/bin/install -c 
liblto_plugin.la `pwd`/../gcc/
libtool: install: /usr/bin/install -c .libs/liblto_plugin.lai
/home/joty/projects/gccsdk/gccsdk_svn7/gcc4/builddir/cross-gcc/lto-plugin/../gcc/liblto_plugin.la
libtool: install: /usr/bin/install -c .libs/liblto_plugin.a
/home/joty/projects/gccsdk/gccsdk_svn7/gcc4/builddir/cross-gcc/lto-plugin/../gcc/liblto_plugin.a
libtool: install: chmod 644
/home/joty/projects/gccsdk/gccsdk_svn7/gcc4/builddir/cross-gcc/lto-plugin/../gcc/liblto_plugin.a
libtool: install: ranlib
/home/joty/projects/gccsdk/gccsdk_svn7/gcc4/builddir/cross-gcc/lto-plugin/../gcc/liblto_plugin.a
libtool: install: warning: remember to run `libtool --finish
/home/joty/projects/gccsdk/riscos7/cross/libexec/gcc/arm-unknown-eabi/4.6.0'
make  all-am
make[5]: Entering directory
`/home/joty/projects/gccsdk/gccsdk_svn7/gcc4/builddir/cross-gcc/lto-plugin'
make[5]: Leaving directory
`/home/joty/projects/gccsdk/gccsdk_svn7/gcc4/builddir/cross-gcc/lto-plugin'
make[4]: Leaving directory
`/home/joty/projects/gccsdk/gccsdk_svn7/gcc4/builddir/cross-gcc/lto-plugin'
--8<--

I.e. only static library of lto-plugin gets built.