[llvm-commits] [llvm-gcc-4.2] r67516 - in /llvm-gcc-4.2/trunk/gcc/config: i386/linux.h i386/linux64.h rs6000/sysv4.h

[Duncan Sands]

Hi Nick,

> > Revert commit 67369: older versions of ld do not
> > support the --hash-style option, for example
> >   GNU ld version 2.17 Debian GNU/Linux
> > which is in use on a couple of nightly testers.
> 
> Hi Duncan. What does GCC do here? Detect it at configure time?

it seems gcc mainline does not do this.  I grepped for "hash-style",
but there was nothing interesting.

Ciao,

Duncan.

> The difference is seen with:
> 
>    int main() { return 0; }
> 
> compiled by the llvm-g++ driver vs. the FSF g++ driver. When built 
> without --hash-style "valgrind --tool=callgrind" reports 2,206,956 
> instructions vs. 1,334,028 with this patch. The extra instructions are 
> due to the dynamic linker doing extra work to load the program.
> 
> Nick
> 
> > Modified:
> >     llvm-gcc-4.2/trunk/gcc/config/i386/linux.h
> >     llvm-gcc-4.2/trunk/gcc/config/i386/linux64.h
> >     llvm-gcc-4.2/trunk/gcc/config/rs6000/sysv4.h
> > 
> > Modified: llvm-gcc-4.2/trunk/gcc/config/i386/linux.h
> > URL: http://llvm.org/viewvc/llvm-project/llvm-gcc-4.2/trunk/gcc/config/i386/linux.h?rev=67516&r1=67515&r2=67516&view=diff
> > 
> > ==============================================================================
> > --- llvm-gcc-4.2/trunk/gcc/config/i386/linux.h (original)
> > +++ llvm-gcc-4.2/trunk/gcc/config/i386/linux.h Mon Mar 23 05:54:30 2009
> > @@ -109,8 +109,7 @@
> >    { "dynamic_linker", LINUX_DYNAMIC_LINKER }
> >  
> >  #undef	LINK_SPEC
> > -/* LLVM LOCAL set linker hash_style */
> > -#define LINK_SPEC "-m %(link_emulation) --hash-style=both %{shared:-shared} \
> > +#define LINK_SPEC "-m %(link_emulation) %{shared:-shared} \
> >    %{!shared: \
> >      %{!ibcs: \
> >        %{!static: \
> > 
> > Modified: llvm-gcc-4.2/trunk/gcc/config/i386/linux64.h
> > URL: http://llvm.org/viewvc/llvm-project/llvm-gcc-4.2/trunk/gcc/config/i386/linux64.h?rev=67516&r1=67515&r2=67516&view=diff
> > 
> > ==============================================================================
> > --- llvm-gcc-4.2/trunk/gcc/config/i386/linux64.h (original)
> > +++ llvm-gcc-4.2/trunk/gcc/config/i386/linux64.h Mon Mar 23 05:54:30 2009
> > @@ -53,8 +53,7 @@
> >  #define GLIBC_DYNAMIC_LINKER64 "/lib64/ld-linux-x86-64.so.2"
> >  
> >  #undef	LINK_SPEC
> > -/* LLVM LOCAL set linker hash_style */
> > -#define LINK_SPEC "%{!m32:-m elf_x86_64} %{m32:-m elf_i386} --hash-style=both \
> > +#define LINK_SPEC "%{!m32:-m elf_x86_64} %{m32:-m elf_i386} \
> >    %{shared:-shared} \
> >    %{!shared: \
> >      %{!static: \
> > 
> > Modified: llvm-gcc-4.2/trunk/gcc/config/rs6000/sysv4.h
> > URL: http://llvm.org/viewvc/llvm-project/llvm-gcc-4.2/trunk/gcc/config/rs6000/sysv4.h?rev=67516&r1=67515&r2=67516&view=diff
> > 
> > ==============================================================================
> > --- llvm-gcc-4.2/trunk/gcc/config/rs6000/sysv4.h (original)
> > +++ llvm-gcc-4.2/trunk/gcc/config/rs6000/sysv4.h Mon Mar 23 05:54:30 2009
> > @@ -910,9 +910,8 @@
> >  #define LINUX_DYNAMIC_LINKER \
> >    CHOOSE_DYNAMIC_LINKER (GLIBC_DYNAMIC_LINKER, UCLIBC_DYNAMIC_LINKER)
> >  
> > -/* LLVM LOCAL set linker hash_style */
> > -#define LINK_OS_LINUX_SPEC "-m elf32ppclinux --hash-style=both %{!shared: \
> > -  %{!static: %{rdynamic:-export-dynamic} \
> > +#define LINK_OS_LINUX_SPEC "-m elf32ppclinux %{!shared: %{!static: \
> > +  %{rdynamic:-export-dynamic} \
> >    %{!dynamic-linker:-dynamic-linker " LINUX_DYNAMIC_LINKER "}}}"
> >  
> >  #if defined(HAVE_LD_EH_FRAME_HDR)
> > 
> > 
> > _______________________________________________
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> > llvm-commits at cs.uiuc.edu
> > http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits
> > 
> 
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