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Re: LTO with cross compiler and static linking


On 03/19/2013 05:42 PM, Andrew Pinski wrote:
On Tue, Mar 19, 2013 at 9:28 AM, Sebastian Huber
<sebastian.huber@embedded-brains.de> wrote:
On 03/19/2013 04:50 PM, Andrew Pinski wrote:

On Tue, Mar 19, 2013 at 3:30 AM, Sebastian Huber
<sebastian.huber@embedded-brains.de>  wrote:

Hello,

I test currently the GCC 4.8 release candidate.  Some GCC LTO tests fail
for
me since the introduction of LTO in GCC.  I use Binutils 2.23.1 for
PowerPC
EABI (powerpc-rtems4.11 target) configured with:

/scratch/archive/binutils-2.23.1/configure --target=powerpc-rtems4.11
--prefix=/scratch/install-4.8.0-RC-20130316 --disable-werror
--enable-lto

For GCC I use:

/scratch/archive/gcc-4.8.0-RC-20130316/configure --disable-werror
--enable-threads=rtems --with-gnu-as --disable-multilib --enable-lto
--enable-newlib-mb --enable-newlib-iconv --with-gnu-ld --with-newlib
--verbose --with-system-zlib --disable-nls
--enable-version-specific-runtime-libs --enable-languages=c,c++
--target=powerpc-rtems4.11 --prefix=/scratch/install-4.8.0-RC-20130316


The easiest fix is inside the GCC testsuite itself.  In
testsuite/gcc.c-torture/execute/builtins/builtins.exp change:
if { [istarget *-*-eabi*]
       || [istarget *-*-elf] } {
     lappend additional_flags "-Wl,--allow-multiple-definition"
}
To:
if { [istarget *-*-eabi*]
       || [istarget *-*-elf]
       || [istarget *-*-rtems*]} {
     lappend additional_flags "-Wl,--allow-multiple-definition"
}


Ok, so you say that this multiple definition with LTO is intentional for
statically linked applications?

For this set of testcases yes.  They are explicitly having multiple
defined symbols.

Just for reference there is also a GCC PR for this topic:

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55994

--
Sebastian Huber, embedded brains GmbH

Address : Dornierstr. 4, D-82178 Puchheim, Germany
Phone   : +49 89 189 47 41-16
Fax     : +49 89 189 47 41-09
E-Mail  : sebastian.huber@embedded-brains.de
PGP     : Public key available on request.

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