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patches/glibc/ports-2.10.1/120-i386-x86_64-revert-clone-cfi.patch
author Johannes Stezenbach <js@sig21.net>
Thu Jul 29 19:47:16 2010 +0200 (2010-07-29)
changeset 2045 fdaa6c7f6dea
permissions -rw-r--r--
cc/gcc: add option to compile against static libstdc++, for gcc-4.4 and newer

Idea and know-how taken from CodeSourcery build script.

Normal build:
$ ldd arm-unknown-linux-uclibcgnueabi-gcc
linux-gate.so.1 => (0xb77f3000)
libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0xb76e8000)
libc.so.6 => /lib/i686/cmov/libc.so.6 (0xb75a1000)
libm.so.6 => /lib/i686/cmov/libm.so.6 (0xb757a000)
/lib/ld-linux.so.2 (0xb77f4000)
libgcc_s.so.1 => /lib/libgcc_s.so.1 (0xb755c000)

CC_STATIC_LIBSTDCXX=y:
$ ldd arm-unknown-linux-uclibcgnueabi-gcc
linux-gate.so.1 => (0xb7843000)
libc.so.6 => /lib/i686/cmov/libc.so.6 (0xb76e6000)
/lib/ld-linux.so.2 (0xb7844000)

I made CC_STATIC_LIBSTDCXX default=y since I think
it is always desirable.

Signed-off-by: Johannes Stezenbach <js@sig21.net> 
     1 revert cfi additions to clone on i386/x86_64 to workaround problems in

     2 gcc's unwinder code.  this is not a bug in glibc, it triggers problems

     3 elsewhere.  this cfi code does not gain us a whole lot anyways.

     4 

     5 http://gcc.gnu.org/ml/gcc/2006-12/msg00293.html

     6 

     7 Index: sysdeps/unix/sysv/linux/i386/clone.S

     8 ===================================================================

     9 RCS file: /cvs/glibc/libc/sysdeps/unix/sysv/linux/i386/clone.S,v

    10 retrieving revision 1.27

    11 retrieving revision 1.26

    12 diff -u -p -r1.27 -r1.26

    13 

    14 diff -durN glibc-2.10.1.orig/sysdeps/unix/sysv/linux/i386/clone.S glibc-2.10.1/sysdeps/unix/sysv/linux/i386/clone.S

    15 --- glibc-2.10.1.orig/sysdeps/unix/sysv/linux/i386/clone.S	2006-12-04 00:12:36.000000000 +0100

    16 +++ glibc-2.10.1/sysdeps/unix/sysv/linux/i386/clone.S	2009-11-13 00:49:45.000000000 +0100

    17 @@ -120,9 +120,6 @@

    18  	ret

    19  

    20  L(thread_start):

    21 -	cfi_startproc;

    22 -	/* Clearing frame pointer is insufficient, use CFI.  */

    23 -	cfi_undefined (eip);

    24  	/* Note: %esi is zero.  */

    25  	movl	%esi,%ebp	/* terminate the stack frame */

    26  #ifdef RESET_PID

    27 @@ -155,7 +152,6 @@

    28  	jmp	L(haspid)

    29  	.previous

    30  #endif

    31 -	cfi_endproc;

    32  

    33  	cfi_startproc

    34  PSEUDO_END (BP_SYM (__clone))

    35 diff -durN glibc-2.10.1.orig/sysdeps/unix/sysv/linux/x86_64/clone.S glibc-2.10.1/sysdeps/unix/sysv/linux/x86_64/clone.S

    36 --- glibc-2.10.1.orig/sysdeps/unix/sysv/linux/x86_64/clone.S	2006-12-04 00:12:36.000000000 +0100

    37 +++ glibc-2.10.1/sysdeps/unix/sysv/linux/x86_64/clone.S	2009-11-13 00:49:45.000000000 +0100

    38 @@ -89,9 +89,6 @@

    39  	ret

    40  

    41  L(thread_start):

    42 -	cfi_startproc;

    43 -	/* Clearing frame pointer is insufficient, use CFI.  */

    44 -	cfi_undefined (rip);

    45  	/* Clear the frame pointer.  The ABI suggests this be done, to mark

    46  	   the outermost frame obviously.  */

    47  	xorl	%ebp, %ebp

    48 @@ -116,7 +113,6 @@

    49  	/* Call exit with return value from function call. */

    50  	movq	%rax, %rdi

    51  	call	HIDDEN_JUMPTARGET (_exit)

    52 -	cfi_endproc;

    53  

    54  	cfi_startproc;

    55  PSEUDO_END (BP_SYM (__clone))
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