Use Solaris 11 (download in case you do not have one, and install into your prefered virtualization environment). Use latest Sun Studio.

Try to compile 5.5 with it

export CC=cc
export CXX=CC
cmake .
make

get error messages similar to

"/home/wlad/bzr/5.5-threadpool/sql/gcalc_slicescan.h", line 191: Error: A declaration does not specify a tag or an identifier.
"/home/wlad/bzr/5.5-threadpool/sql/gcalc_slicescan.h", line 202: Error: A declaration does not specify a tag or an identifier.
"/home/wlad/bzr/5.5-threadpool/sql/gcalc_slicescan.h", line 208: Error: A declaration does not specify a tag or an identifier.
"/home/wlad/bzr/5.5-threadpool/sql/gcalc_slicescan.h", line 209: Warning: Types cannot be declared in anonymous union.
"/home/wlad/bzr/5.5-threadpool/sql/gcalc_slicescan.h", line 212: Error: left is not defined.
"/home/wlad/bzr/5.5-threadpool/sql/gcalc_slicescan.h", line 214: Error: top_node is not defined.
"/home/wlad/bzr/5.5-threadpool/sql/gcalc_slicescan.h", line 381: Error: shape is not a member of Gcalc_heap::Info.
"/home/wlad/bzr/5.5-threadpool/sql/item.h", line 3683: Warning: arg hides Item_insert_value::arg.
6 Error(s) and 2 Warning(s) detected.