Debug build on p8 is broken

/home/buildbot/maria-slave/power8-vlp01-bintar-debug/build/sql/item_cmpfunc.cc: In member function 'virtual String* Item_func_if::str_op(String*)':

/home/buildbot/maria-slave/power8-vlp01-bintar-debug/build/sql/item_cmpfunc.cc:2695:33: error: suggest parentheses around assignment used as truth value [-Werror=parentheses]

   if (null_value=arg->null_value)

                                 ^

/home/buildbot/maria-slave/power8-vlp01-bintar-debug/build/sql/item_cmpfunc.cc: In member function 'virtual my_decimal* Item_func_if::decimal_op(my_decimal*)':

/home/buildbot/maria-slave/power8-vlp01-bintar-debug/build/sql/item_cmpfunc.cc:2707:34: error: suggest parentheses around assignment used as truth value [-Werror=parentheses]

   if (null_value= arg->null_value)

                                  ^

[ 80%] Built target ma_pagecache_consist_64k-t

Scanning dependencies of target ma_pagecache_consist_64kWR-t

[ 80%] Building C object storage/maria/unittest/CMakeFiles/ma_pagecache_consist_64kWR-t.dir/ma_pagecache_consist.c.o

cc1plus: all warnings being treated as errors

make[2]: *** [sql/CMakeFiles/sql.dir/item_cmpfunc.cc.o] Error 1

make[1]: *** [sql/CMakeFiles/sql.dir/all] Error 2

make[1]: *** Waiting for unfinished jobs....

[ 80%] Building C object storage/maria/unittest/CMakeFiles/ma_pagecache_consist_64kWR-t.dir/test_file.c.o

Linking CXX executable ma_pagecache_consist_64kWR-t

[ 80%] Built target ma_pagecache_consist_64kHC-t

[ 80%] Built target ma_pagecache_consist_64kRD-t

[ 80%] Built target ma_pagecache_consist_64kWR-t

make: *** [all] Error 2

Changed by	Oleksandr Byelkin <sanja@mariadb.com>

Changed at	Fri 04 Sep 2015 16:56:58

Repository	https://github.com/MariaDB/server

Branch	5.5

Revision	102a85f9f30cdf8c3baa3893c68932617240bfa6

Comments

MDEV-8663: IF Statement returns multiple values erroneously (or Assertion `!null_value' failed in Item::send(Protocol*, String*))

Postreview addons by Bar

Fix: keeping contract: NULL value mean NULL pointer in val_str and val_deciman.