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[Bug lto/53337] New: [4.7.1 lto] produces warning: relocation refers to discarded section in linker (gold, binutil 2.22)

From: "vincenzo.innocente at cern dot ch" <gcc-bugzilla at gcc dot gnu dot org>
To: gcc-bugs at gcc dot gnu dot org
Date: Sun, 13 May 2012 16:42:02 +0000
Subject: [Bug lto/53337] New: [4.7.1 lto] produces warning: relocation refers to discarded section in linker (gold, binutil 2.22)
Auto-submitted: auto-generated

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53337

             Bug #: 53337
           Summary: [4.7.1 lto] produces warning: relocation refers to
                    discarded section in linker (gold, binutil 2.22)
    Classification: Unclassified
           Product: gcc
           Version: 4.7.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: lto
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: vincenzo.innocente@cern.ch


I get these kind of warnings (from gold) with 4.7.1, not with 4.8

c++ -v
Using built-in specs.
COLLECT_GCC=c++
COLLECT_LTO_WRAPPER=/build/ge/new-binutils/b/slc5_amd64_gcc470/external/gcc/4.7.0-cms/bin/../libexec/gcc/x86_64-unknown-linux-gnu/4.7.1/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../configure
--prefix=/build/ge/new-binutils/b/tmp/BUILDROOT/a72d117de7727d2dbd542a4ad4d72e45/opt/cmssw/slc5_amd64_gcc470/external/gcc/4.7.0-cms
--disable-multilib --disable-nls --enable-languages=c,c++,fortran
--enable-gold=yes --enable-lto
--with-gmp=/build/ge/new-binutils/b/tmp/BUILDROOT/a72d117de7727d2dbd542a4ad4d72e45/opt/cmssw/slc5_amd64_gcc470/external/gcc/4.7.0-cms
--with-mpfr=/build/ge/new-binutils/b/tmp/BUILDROOT/a72d117de7727d2dbd542a4ad4d72e45/opt/cmssw/slc5_amd64_gcc470/external/gcc/4.7.0-cms
--with-mpc=/build/ge/new-binutils/b/tmp/BUILDROOT/a72d117de7727d2dbd542a4ad4d72e45/opt/cmssw/slc5_amd64_gcc470/external/gcc/4.7.0-cms
--with-ppl=/build/ge/new-binutils/b/tmp/BUILDROOT/a72d117de7727d2dbd542a4ad4d72e45/opt/cmssw/slc5_amd64_gcc470/external/gcc/4.7.0-cms
--with-cloog=/build/ge/new-binutils/b/tmp/BUILDROOT/a72d117de7727d2dbd542a4ad4d72e45/opt/cmssw/slc5_amd64_gcc470/external/gcc/4.7.0-cms
--enable-cloog-backend=isl --enable-shared CC='gcc -fPIC' CXX='c++ -fPIC'
CPP=cpp CXXCPP='c++ -E'
Thread model: posix
gcc version 4.7.1 20120510 (prerelease) (GCC) 
ld -v
GNU gold (GNU Binutils 2.22) 1.11

when complied with -flto and -O2 this simple code

cat boostLto.cc 
#include "boost/thread/mutex.hpp"
namespace edm {
  namespace rootfix {
    boost::mutex* getGlobalMutex();
  }
}

boost::mutex* edm::rootfix::getGlobalMutex() { 
    static boost::mutex m_;
    return &m_;
}

produces

c++ -O2 -fPIC -shared -o bha.so boostLto.cc -Iboost/1.49.0/include

c++ -O2 -flto -fPIC -shared -o bha.so boostLto.cc -Iboost/1.49.0/include
/tmp/innocent/ccwLpwep.ltrans1.ltrans.o:ccwLpwep.ltrans1.o:function
_ZTVN5boost16exception_detail10clone_implINS0_19error_info_injectorISt12out_of_rangeEEEE.local.234:
warning: relocation refers to discarded section
/tmp/innocent/ccwLpwep.ltrans1.ltrans.o:ccwLpwep.ltrans1.o:function
_ZTVN5boost16exception_detail10clone_implINS0_19error_info_injectorISt12out_of_rangeEEEE.local.234:
warning: relocation refers to discarded section
/tmp/innocent/ccwLpwep.ltrans1.ltrans.o:ccwLpwep.ltrans1.o:function
_ZTVN5boost16exception_detail10clone_implINS0_19error_info_injectorISt12out_of_rangeEEEE.local.234:
warning: relocation refers to discarded section
/tmp/innocent/ccwLpwep.ltrans1.ltrans.o:ccwLpwep.ltrans1.o:function
_ZTVN5boost16exception_detail10clone_implINS0_19error_info_injectorISt12out_of_rangeEEEE.local.234:
warning: relocation refers to discarded section
/tmp/innocent/ccwLpwep.ltrans1.ltrans.o:ccwLpwep.ltrans1.o:function
_ZTVN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_9gregorian15bad_day_of_yearEEEEE.local.240:
warning: relocation refers to discarded section
/tmp/innocent/ccwLpwep.ltrans1.ltrans.o:ccwLpwep.ltrans1.o:function
_ZTVN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_9gregorian15bad_day_of_yearEEEEE.local.240:
warning: relocation refers to discarded section
/tmp/innocent/ccwLpwep.ltrans1.ltrans.o:ccwLpwep.ltrans1.o:function
_ZTVN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_9gregorian15bad_day_of_yearEEEEE.local.240:
warning: relocation refers to discarded section
/tmp/innocent/ccwLpwep.ltrans1.ltrans.o:ccwLpwep.ltrans1.o:function
_ZTVN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_9gregorian15bad_day_of_yearEEEEE.local.240:
warning: relocation refers to discarded section
/tmp/innocent/ccwLpwep.ltrans1.ltrans.o:ccwLpwep.ltrans1.o:function
_ZTVN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_9gregorian16bad_day_of_monthEEEEE.local.232:
warning: relocation refers to discarded section
/tmp/innocent/ccwLpwep.ltrans1.ltrans.o:ccwLpwep.ltrans1.o:function
_ZTVN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_9gregorian16bad_day_of_monthEEEEE.local.232:
warning: relocation refers to discarded section
/tmp/innocent/ccwLpwep.ltrans1.ltrans.o:ccwLpwep.ltrans1.o:function
_ZTVN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_9gregorian16bad_day_of_monthEEEEE.local.232:
warning: relocation refers to discarded section
/tmp/innocent/ccwLpwep.ltrans1.ltrans.o:ccwLpwep.ltrans1.o:function
_ZTVN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_9gregorian16bad_day_of_monthEEEEE.local.232:
warning: relocation refers to discarded section
/tmp/innocent/ccwLpwep.ltrans2.ltrans.o:ccwLpwep.ltrans2.o:function
_ZTVN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_12bad_weak_ptrEEEEE.local.230:
warning: relocation refers to discarded section
/tmp/innocent/ccwLpwep.ltrans2.ltrans.o:ccwLpwep.ltrans2.o:function
_ZTVN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_12bad_weak_ptrEEEEE.local.230:
warning: relocation refers to discarded section
/tmp/innocent/ccwLpwep.ltrans2.ltrans.o:ccwLpwep.ltrans2.o:function
_ZTVN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_12bad_weak_ptrEEEEE.local.230:
warning: relocation refers to discarded section
/tmp/innocent/ccwLpwep.ltrans2.ltrans.o:ccwLpwep.ltrans2.o:function
_ZTVN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_12bad_weak_ptrEEEEE.local.230:
warning: relocation refers to discarded section
/tmp/innocent/ccwLpwep.ltrans5.ltrans.o:ccwLpwep.ltrans5.o:function
_ZTVN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_9gregorian11bad_weekdayEEEEE.local.246:
warning: relocation refers to discarded section
/tmp/innocent/ccwLpwep.ltrans5.ltrans.o:ccwLpwep.ltrans5.o:function
_ZTVN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_9gregorian11bad_weekdayEEEEE.local.246:
warning: relocation refers to discarded section
/tmp/innocent/ccwLpwep.ltrans5.ltrans.o:ccwLpwep.ltrans5.o:function
_ZTVN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_9gregorian11bad_weekdayEEEEE.local.246:
warning: relocation refers to discarded section
/tmp/innocent/ccwLpwep.ltrans5.ltrans.o:ccwLpwep.ltrans5.o:function
_ZTVN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_9gregorian11bad_weekdayEEEEE.local.246:
warning: relocation refers to discarded section
/tmp/innocent/ccwLpwep.ltrans5.ltrans.o:ccwLpwep.ltrans5.o:function
_ZTVN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_21thread_resource_errorEEEEE.local.236:
warning: relocation refers to discarded section
/tmp/innocent/ccwLpwep.ltrans5.ltrans.o:ccwLpwep.ltrans5.o:function
_ZTVN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_21thread_resource_errorEEEEE.local.236:
warning: relocation refers to discarded section
/tmp/innocent/ccwLpwep.ltrans5.ltrans.o:ccwLpwep.ltrans5.o:function
_ZTVN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_21thread_resource_errorEEEEE.local.236:
warning: relocation refers to discarded section
/tmp/innocent/ccwLpwep.ltrans5.ltrans.o:ccwLpwep.ltrans5.o:function
_ZTVN5boost16exception_detail10clone_implINS0_19error_info_injectorINS_21thread_resource_errorEEEEE.local.236:
warning: relocation refers to discarded section

Follow-Ups:
- [Bug lto/53337] [4.7.1 lto] produces warning: relocation refers to discarded section in linker (gold, binutil 2.22)
  - From: vincenzo.innocente at cern dot ch
- [Bug lto/53337] 4.7.1 lto produces warning: relocation refers to discarded section in linker (gold, binutil 2.22)
  - From: hjl.tools at gmail dot com
- [Bug lto/53337] 4.7.1 lto produces warning: relocation refers to discarded section in linker (gold, binutil 2.22)
  - From: vincenzo.innocente at cern dot ch
- [Bug lto/53337] 4.7.1 lto produces warning: relocation refers to discarded section in linker (gold, binutil 2.22)
  - From: vincenzo.innocente at cern dot ch

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