Add option a new sim-hint  no-nptl-pthread-stackcache.

Activating this hint using --sim-hints=no-nptl-pthread-stackcache
means the glibc nptl stack cache will be disabled.

Disabling this stack/tls cache avoids helgrind false positive race conditions
errors when using __thread variables.

Note: disabling the stack cache is done by a kludge, dependent on
internal knowledge of glibc code, and using libpthread debug info.
So, this kludge might be broken with newer glibc version.
This has been tested on various platforms and various
glibc versions 2.11, 2.16 and 2.18

To check if the disabling works, you can do:
valgrind --tool=helgrind --sim-hints=no-nptl-pthread-stackcache -d -v ./helgrind/tests/tls_threads |& grep kludge

If you see the below 2 lines, then hopefully the stack cache has been disabled.
--12624-- deactivate nptl pthread stackcache via kludge: found symbol stack_cache_actsize at addr 0x3AF178
--12624:1:sched    pthread stack cache size disabling done via kludge




git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14313 a5019735-40e9-0310-863c-91ae7b9d1cf9
drd/tests/tls_threads: Add

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14314 a5019735-40e9-0310-863c-91ae7b9d1cf9
helgrind/tests: Update Subversion ignore list

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14315 a5019735-40e9-0310-863c-91ae7b9d1cf9
auxprogs: Update Subversion ignore list

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14316 a5019735-40e9-0310-863c-91ae7b9d1cf9
configure should check for warning flags supported to disable them (#338205).

Configure would check whether gcc supported -Wno... flags. But gcc always
does. It is happy to just not warn about anything. So flip all configure
checks to test for the warning and only when gcc accepts the warning flag
use -Wno-...

Introduces two helper functions to make it easier to add new flag checks.
AC_GCC_WARNING_COND and AC_GCC_WARNING_SUBST_NO.

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14319 a5019735-40e9-0310-863c-91ae7b9d1cf9
Kind of a follow-up to r14237.
pre_mem_read_sockaddr: in the case where the caller doesn't
specify any address family (that is, the family is AF_UNSPEC)
don't perform any further checks on the supplied |sa| address
block, since doing so merely gives rise to false uninitialised
value errors.



git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14320 a5019735-40e9-0310-863c-91ae7b9d1cf9
Remove unused functions CLG_(get_out_file) and CLG_(get_out_directory).
Looks like these were leftovers from early days -- perhaps r7235.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14321 a5019735-40e9-0310-863c-91ae7b9d1cf9
Update in NEWS the gcc release needed to better support Ada tasks termination


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14322 a5019735-40e9-0310-863c-91ae7b9d1cf9
Clean up confusion about VG_(args_the_exename) which was believed to
possibly be NULL in several places. Nowadays, VG_(ii_create_image) will
terminate the process if VG_(args_the_exename) is NULL.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14323 a5019735-40e9-0310-863c-91ae7b9d1cf9