Fix most Compiler warnings seen in buildbot.

Add suppressions for a few warnings that cannot be meaningfully fixed by
MariaDB developers.

Changes for XtraDB, PBXT, and YaSSL also submitted upstream.

Also add a `ccfilter` wrapper that can be used to filter out suppressed warnings in a
local build (to check that new warnings are not introduced).


client/mysqlbinlog.cc:
  Fix compiler warnings.
config/ac-macros/misc.m4:
  Fix wrong naming, autoconfig requires _cv_ in cached names.
extra/yassl/include/yassl_int.hpp:
  Fix compiler warnings.
extra/yassl/src/handshake.cpp:
  Fix compiler warnings.
extra/yassl/src/yassl_imp.cpp:
  Fix compiler warnings.
extra/yassl/src/yassl_int.cpp:
  Fix compiler warnings.
extra/yassl/taocrypt/include/modes.hpp:
  Fix compiler warnings.
extra/yassl/taocrypt/src/asn.cpp:
  Fix compiler warnings.
mysys/my_compress.c:
  Fix compiler warnings.
sql/mysqld.cc:
  Fix compiler warnings.
sql/strfunc.cc:
  Fix compiler warnings.
storage/pbxt/src/discover_xt.cc:
  Fix compiler warnings.
storage/xtradb/fil/fil0fil.c:
  Fix compiler warnings.
storage/xtradb/mtr/mtr0mtr.c:
  Fix compiler warnings.
storage/xtradb/srv/srv0srv.c:
  Fix compiler warnings.
storage/xtradb/srv/srv0start.c:
  Fix compiler warnings.
strings/decimal.c:
  Fix compiler warnings.
support-files/ccfilter:
  Add helper for suppressing compiler warnings in local developer source tree.
      
  Allows to check for not introducing new warnings into Buildbot without having to actually
  run the build through Buildbot.
support-files/compiler_warnings.supp:
  Suppress a few warnings that cannot be meaningfully fixed in source code.

1 files changed, 3 insertions, 2 deletions

diff --git a/mysys/my_compress.c b/mysys/my_compress.c
index 26626d70079..ade2742c4fc 100644
--- a/mysys/my_compress.c
+++ b/mysys/my_compress.c
@@ -81,12 +81,13 @@ my_bool my_compress(uchar *packet, size_t *len, size_t *complen)
   This fix is safe, since such memory is only used internally by zlib, so we
   will not hide any bugs in mysql this way.
 */
-void *my_az_allocator(void *dummy, unsigned int items, unsigned int size)
+void *my_az_allocator(void *dummy __attribute__((unused)), unsigned int items,
+                      unsigned int size)
 {
   return my_malloc((size_t)items*(size_t)size, IF_VALGRIND(MY_ZEROFILL, MYF(0)));
 }
 
-void my_az_free(void *dummy, void *address)
+void my_az_free(void *dummy __attribute__((unused)), void *address)
 {
   my_free(address, MYF(MY_ALLOW_ZERO_PTR));
 }