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patches/glibc/2.5.1/180-alpha-cfi.patch
author "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
Sun Jun 13 23:45:29 2010 +0200 (2010-06-13)
changeset 1982 63cee3d5ab85
parent 744 4bf8448536d5
permissions -rw-r--r--
libc/newlib: build in the 'start files' pass

A few facts:
- building the C library requires a proper core compiler
- core compiler is issued from one of the core passes
- the C library is required to build libstdc++
- newlib is only built for baremetal
- in bare metal, the final compiler is issued from one of the core passes

So we need to build the C library between core pass 1 and core pass 2.
The only place is eithe libc_headers() or libc_start_files(). The most
pertinent seems to be libc_start_files().

So we build newlib from libc_start_files(), and leave libc() empty. 
     1 --- libc/nptl/sysdeps/unix/sysv/linux/alpha/sysdep-cancel.h    2006/10/29 21:48:06     1.6

     2 +++ libc/nptl/sysdeps/unix/sysv/linux/alpha/sysdep-cancel.h    2007/03/13 21:28:03     1.7

     3 @@ -55,6 +55,7 @@

     4  	bne	a3, SYSCALL_ERROR_LABEL;			\

     5  __LABEL($pseudo_ret)						\

     6  	.subsection 2;						\

     7 +	cfi_startproc;						\

     8  __LABEL($pseudo_cancel)						\

     9  	subq	sp, 64, sp;					\

    10  	cfi_def_cfa_offset(64);					\

    11 @@ -90,12 +91,13 @@

    12  	cfi_def_cfa_offset(0);					\

    13  __LABEL($syscall_error)						\

    14  	SYSCALL_ERROR_HANDLER;					\

    15 +	cfi_endproc;						\

    16  	.previous

    17  

    18  # undef PSEUDO_END

    19  # define PSEUDO_END(sym)					\

    20 -	.subsection 2;						\

    21  	cfi_endproc;						\

    22 +	.subsection 2;						\

    23  	.size sym, .-sym

    24  

    25  # define SAVE_ARGS_0	/* Nothing.  */
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