gdb and binutils branch master updated. a82bef932ec11cc16f205427f8a056c3c0ea517d

[tmsriram at sourceware dot org]

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https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=a82bef932ec11cc16f205427f8a056c3c0ea517d

commit a82bef932ec11cc16f205427f8a056c3c0ea517d
Author: Sriraman Tallam <tmsriram@google.com>
Date:   Tue May 13 10:51:48 2014 -0700

    With -pie and x86, the linker complains if it sees a PC-relative relocation
    to access a global as it expects a GOTPCREL relocation.  This is really not
    necessary as the linker could use a copy relocation to get around it.  This
    patch enables copy relocations with pie.
    
    Context:
    This is useful because currently the GCC compiler with option -fpie makes
    every extern global access go through the GOT. That is because the compiler
    cannot tell if a global will end up being defined in the executable or not
    and is conservative. This ends up hurting performance when the binary is linked
    as mostly static where most of the globals do end up being defined in the
    executable.  By allowing copy relocs with fPIE, the compiler need not generate
    a GOTPCREL(GOT access) for any global access.  It can safely assume that all
    globals will be defined in the executable and generate a PC-relative access
    instead.  Gold can then create a copy reloc for only the undefined globals.
    
    	gold/
    	* symtab.h (may_need_copy_reloc): Remove check for position independent
    	code.
    	* x86_64.cc (Target_x86_64<size>::Scan::global): Add check for no
    	position independence before pc absolute may_need_copy_reloc call.
    	Add check for executable output befor pc relative may_need_copy_reloc
    	call.
    	* i386.cc: Ditto.
    	* arm.cc: Ditto.
    	* sparc.cc: Ditto.
    	* tilegx.cc: Ditto.
    	* powerpc.cc: Add check for no position independence before
    	may_need_copy_reloc calls.
    	* testsuite/pie_copyrelocs_test.cc: New file.
    	* testsuite/pie_copyrelocs_shared_test.cc: New file.
    	* Makefile.am (pie_copyrelocs_test): New test.
    	* Makefile.in: Regenerate.

-----------------------------------------------------------------------

Summary of changes:
 gold/ChangeLog             |   19 +++++++++++++++++++
 gold/arm.cc                |    6 ++++--
 gold/i386.cc               |    6 ++++--
 gold/powerpc.cc            |    6 ++++--
 gold/sparc.cc              |    6 ++++--
 gold/symtab.h              |    3 +--
 gold/testsuite/Makefile.am |   10 ++++++++++
 gold/testsuite/Makefile.in |   42 ++++++++++++++++++++++++++++++++----------
 gold/tilegx.cc             |    6 ++++--
 gold/x86_64.cc             |    6 ++++--
 10 files changed, 86 insertions(+), 24 deletions(-)


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