Add a new warning to gcc, -Wvariable-decl, which causes it to warn for
auto declarations which size are not known at compile time.

This flag will eventually be added to the kernel makefiles so that

Add a new warning to gcc, -Wvariable-decl, which causes it to warn for
auto declarations which size are not known at compile time.

This flag will eventually be added to the kernel makefiles so that we
can rely on -Wstack-larger-than work.

ok deraadt@ mbalmer@ otto@ marco@

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gcc 3.3.5

Import gcc-3.3.2. Only the compiler. ada frontend removed for space
considerations.