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patches/gcc/4.3.2/110-trampolinewarn.patch
author "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
Sun Jul 17 22:43:07 2011 +0200 (2011-07-17)
changeset 2893 a8a65758664f
parent 747 d3e603e7c17c
permissions -rw-r--r--
cc/gcc: do not use the core pass-2 to build the baremetal compiler

In case we build a baremetal compiler, use the standard passes:
- core_cc is used to build the C library;
- as such, it is meant to run on build, not host;
- the final compiler is meant to run on host;

As the current final compiler step can not build a baremetal compiler,
call the core backend from the final step.

NB: Currently, newlib is built during the start_files pass, so we have
to have a core compiler by then... Once we can build the baremetal
compiler from the final cc step, then we can move the newlib build to
the proper step, and then get rid of the core pass-1 static compiler...

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr> 
     1 Original patch from gentoo: gentoo/src/patchsets/gcc/4.3.1/gentoo/00_all_gcc-trampolinewarn.patch

     2 	This trivial patch causes gcc to emit a warning whenever

     3 	it generates a trampoline.  These are otherwise hard to

     4 	locate.  It is rigged to default ON - to have it default

     5 	to OFF remove the text 'Init(1)' from the common.opt

     6 	patch, leaving just 'Common Var(warn_trampolines)'.

     7 	Kevin F. Quinn <kevquinn@gentoo.org> 17 Jan 2006

     8 

     9 diff -durN gcc-4.3.1.orig/gcc/builtins.c gcc-4.3.1/gcc/builtins.c

    10 --- gcc-4.3.1.orig/gcc/builtins.c	2008-04-23 00:36:27.000000000 +0200

    11 +++ gcc-4.3.1/gcc/builtins.c	2008-06-10 14:56:54.000000000 +0200

    12 @@ -5662,6 +5662,9 @@

    13    trampolines_created = 1;

    14    INITIALIZE_TRAMPOLINE (r_tramp, r_func, r_chain);

    15  

    16 +  if (warn_trampolines)

    17 +    warning (OPT_Wtrampolines, "generating trampoline in object (requires executable stack)");

    18 +

    19    return const0_rtx;

    20  }

    21  

    22 diff -durN gcc-4.3.1.orig/gcc/common.opt gcc-4.3.1/gcc/common.opt

    23 --- gcc-4.3.1.orig/gcc/common.opt	2008-01-22 15:11:44.000000000 +0100

    24 +++ gcc-4.3.1/gcc/common.opt	2008-06-10 14:56:54.000000000 +0200

    25 @@ -182,6 +182,10 @@

    26  Common Var(warn_system_headers) Warning

    27  Do not suppress warnings from system headers

    28  

    29 +Wtrampolines

    30 +Common Var(warn_trampolines) Init(1)

    31 +Warn whenever a trampoline is generated

    32 +

    33  Wuninitialized

    34  Common Var(warn_uninitialized) Warning

    35  Warn about uninitialized automatic variables
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