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patches/gcc/4.3.5/110-trampolinewarn.patch
author "Benoît THÉBAUDEAU" <benoit.thebaudeau@advansee.com>
Wed Jun 08 15:47:43 2011 +0200 (2011-06-08)
changeset 2508 9e2761e59a75
parent 1461 35b30f8fb307
permissions -rw-r--r--
debug/cross-gdb: check host dependencies

Cross-gdb depends on expat and python. If either is missing, cross-gdb will
build successfully, but lacking some features.

Especially, if expat is missing, cross-gdb will be unable to parse the target
description, which may lead to runtime malfunctions and the following GDB
warning:
"Can not parse XML target description; XML support was disabled at compile time"

Hence, expat should be considered mandatory.

On the other hand, the features missing without python are not critical, so
python should not be considered mandatory.

This patch does the following:
- At configure time, warn the user if either expat or python is missing.
- In menuconfig, disable the static build options regarding cross-gdb if no
static version of expat is available, and disable cross-gdb if expat is
missing.

Signed-off-by: "Benoît THÉBAUDEAU" <benoit.thebaudeau@advansee.com>
[yann.morin.1998@anciens.enib.fr: add comment for impossible static cross-gdb]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr> 
     1 Original patch from: ../4.3.2/110-trampolinewarn.patch

     2 

     3 -= BEGIN original header =-

     4 Original patch from gentoo: gentoo/src/patchsets/gcc/4.3.1/gentoo/00_all_gcc-trampolinewarn.patch

     5 	This trivial patch causes gcc to emit a warning whenever

     6 	it generates a trampoline.  These are otherwise hard to

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

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

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

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

    11 

    12 -= END original header =-

    13 

    14 diff -durN gcc-4.3.3.orig/gcc/builtins.c gcc-4.3.3/gcc/builtins.c

    15 --- gcc-4.3.3.orig/gcc/builtins.c	2008-08-19 18:37:13.000000000 +0200

    16 +++ gcc-4.3.3/gcc/builtins.c	2009-01-27 22:19:12.000000000 +0100

    17 @@ -5662,6 +5662,9 @@

    18    trampolines_created = 1;

    19    INITIALIZE_TRAMPOLINE (r_tramp, r_func, r_chain);

    20  

    21 +  if (warn_trampolines)

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

    23 +

    24    return const0_rtx;

    25  }

    26  

    27 diff -durN gcc-4.3.3.orig/gcc/common.opt gcc-4.3.3/gcc/common.opt

    28 --- gcc-4.3.3.orig/gcc/common.opt	2008-01-22 15:11:44.000000000 +0100

    29 +++ gcc-4.3.3/gcc/common.opt	2009-01-27 22:19:12.000000000 +0100

    30 @@ -182,6 +182,10 @@

    31  Common Var(warn_system_headers) Warning

    32  Do not suppress warnings from system headers

    33  

    34 +Wtrampolines

    35 +Common Var(warn_trampolines) Init(1)

    36 +Warn whenever a trampoline is generated

    37 +

    38  Wuninitialized

    39  Common Var(warn_uninitialized) Warning

    40  Warn about uninitialized automatic variables
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