Don't read CMAKE_BUILD_TYPE if it is not there (#811)

Weird, but seems consistent with the rest of cmake here.

Don't read CMAKE_BUILD_TYPE if it is not there (#811)
33d44046 · Roman Lebedev · Dominic Hamon · 7d856b03 · 33d44046
Commit 33d44046 authored May 08, 2019 by Roman Lebedev Committed by Dominic Hamon May 07, 2019
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CMakeLists.txt src/CMakeLists.txt +3 -1

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--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -34,7 +34,9 @@ if(LIBRT)
  target_link_libraries(benchmark ${LIBRT})
 endif()

-string(TOUPPER ${CMAKE_BUILD_TYPE} CMAKE_BUILD_TYPE_UPPER)
+if(CMAKE_BUILD_TYPE)
+  string(TOUPPER ${CMAKE_BUILD_TYPE} CMAKE_BUILD_TYPE_UPPER)
+endif()
 if(NOT CMAKE_THREAD_LIBS_INIT AND "${CMAKE_CXX_FLAGS} ${CMAKE_CXX_FLAGS_${CMAKE_BUILD_TYPE_UPPER}}" MATCHES ".*-fsanitize=[^ ]*address.*")
  message(WARNING "CMake's FindThreads.cmake did not fail, but CMAKE_THREAD_LIBS_INIT ended up being empty. This was fixed in https://github.com/Kitware/CMake/commit/d53317130e84898c5328c237186dbd995aaf1c12 Let's guess that -pthread is sufficient.")
  target_link_libraries(benchmark -pthread)