[CMake] How force cmake debug/release

[Andy]

In cmake I have:
if (${CMAKE_BUILD_TYPE} STREQUAL Release)
  message(WARNING "Release")
endif()

if (${CMAKE_BUILD_TYPE} STREQUAL Debug)
  message(WARNING "Debug")
endif()

(how write something like elseif?)

If I call "cmake ." it write: "Warning:Debug"
Debug is default and I must call "cmake . -DCMAKE_BUILD_TYPE=Release"
for release?
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