libsanitizer merge from upstream r175042

[Jakub Jelinek]

On Fri, Feb 15, 2013 at 12:47:30PM +0400, Konstantin Serebryany wrote:
> This is ungood.
> First, clang doesn't like it at all:
> prelink1.cc:18:18: error: init_priority attribute requires integer
> constant between 101 and 65535 inclusive
> A __attribute__((init_priority (1))) a;

For gcc it is just a warning, not error, so you can actually use it if you
know what you are doing.

Anyway, if gold doesn't have any way, you can always do the equivalent
of shell
which prelink 2>/dev/null && prelink -r 0x3600000000 libfoo.so
somewhere in the CMakeLists.txt.  That command doesn't affect system
libraries, can be run as normal user, and just transforms a library
from the default link state to -Wl,-Ttext-segment=0x3600000000
state (including debug info etc.).  You'd need to apt-get install prelink
or whatever command is for that on Ubuntu on the test boxes.

OT, unrelated thing, in include/asan_interface.h there is one
#if __has_feature(address_sanitizer)
which for GCC should better be:
#if (defined __has_feature && __has_feature(address_sanitizer)) \
    || defined(__SANITIZE_ADDRESS__)
(and similarly in asan_internal.h).

	Jakub