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patches/glibc/2.6.1/130-i686-assembler.patch
author "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
Sun Sep 12 23:51:25 2010 +0200 (2010-09-12)
changeset 2123 ff2181adbd28
parent 744 4bf8448536d5
permissions -rw-r--r--
cc/gcc: disable complibs if not selected

Force gcc to not link with some companion libraries when
there are not needed (because selected-out).

There is no option to tell gcc *not* to build the Graphite and/or
LTO stuff. They *will* be built if gcc finds the suitable companion
libraries. If we do not provide them, but the host has them, then
gcc *will* find them, and link with them.

Consider the following:
- host has suitable PPL and CLooG (eg. Debian Squeeze)
- user wants to build gcc>=4.4
- user de-selects GRAPHITE
- gcc will find the hosts PPL and CLooG, and will use them
- the user moves the toolchain to an older host that does
not have them (eg. Debian Lenny)
- the toolchain fails, when it was properly setup not to

So, explicitly tell gcc *not* to use unneeded companion libs.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr> 
     1 2007-02-15  Khem Raj  <kraj@xxxxxxxxxx>

     2 

     3        * sysdeps/unix/sysv/linux/i386/sysdep.h: Re-define __i686.

     4        * nptl/sysdeps/pthread/pt-initfini.c: Ditto.

     5 

     6 

     7 

     8 Index: glibc-2.4/sysdeps/unix/sysv/linux/i386/sysdep.h

     9 ===================================================================

    10 --- glibc-2.4/sysdeps/unix/sysv/linux/i386/sysdep.h	(revision 1469)

    11 +++ glibc-2.4/sysdeps/unix/sysv/linux/i386/sysdep.h	(working copy)

    12 @@ -29,6 +29,10 @@

    13  #include <dl-sysdep.h>

    14  #include <tls.h>

    15  

    16 +#if defined __i686 && defined __ASSEMBLER__

    17 +#undef __i686

    18 +#define __i686 __i686

    19 +#endif

    20  

    21  /* For Linux we can use the system call table in the header file

    22  	/usr/include/asm/unistd.h

    23 Index: glibc-2.4/nptl/sysdeps/pthread/pt-initfini.c

    24 ===================================================================

    25 --- glibc-2.4/nptl/sysdeps/pthread/pt-initfini.c	(revision 1469)

    26 +++ glibc-2.4/nptl/sysdeps/pthread/pt-initfini.c	(working copy)

    27 @@ -45,6 +45,11 @@

    28  /* Embed an #include to pull in the alignment and .end directives. */

    29  asm ("\n#include \"defs.h\"");

    30  

    31 +asm ("\n#if defined __i686 && defined __ASSEMBLER__");

    32 +asm ("\n#undef __i686");

    33 +asm ("\n#define __i686 __i686");

    34 +asm ("\n#endif");

    35 +

    36  /* The initial common code ends here. */

    37  asm ("\n/*@HEADER_ENDS*/");

    38
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