Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3704
build -a X64 -t CLANG38 -b RELEASE -p OvmfPkg/OvmfPkgX64.dsc
results in
UDK/MdeModulePkg/Library/UefiBootManagerLib/BmBoot.c:1284:31:
error: variable 'Status' set but not used
[-Werror,-Wunused-but-set-variable]
Signed-off-by: Mikhail Krichanov <krichanov@ispras.ru>