cherry-picked fixes by emlai, fix compilation again#54

Merged

icculus merged 7 commits intoicculus:masterfrom DanielGibson:fix-warnings-rebase

May 29, 2016

+120-141

Commits on May 29, 2016

Fix ASSERT(<string_literal>)

emlai
authored and
DanielGibson
committed
Use ASSERTALWAYS(msg) instead of ASSERT(false && msg)

emlai
authored and
DanielGibson
committed
Change remaining "if (this!=NULL)" to "ASSERT(this!=NULL)"

emlai
authored and
DanielGibson
committed
Remove unneeded -Wno-sign-compare

emlai
authored and
DanielGibson
committed
Fix warning -Wchar-subscripts

emlai
authored and
DanielGibson
committed
Fix warning -Wtautological-undefined-compare

emlai
authored and
DanielGibson
committed
Fix compilation from changes for GCC 6.1.1
DanielGibson
committed