[OpenMP][libomp][CMake] set and use uppercase_CMAKE_BUILD_TYPE

[jlpeyton]

Summary

Have standalone builds define uppercase_CMAKE_BUILD_TYPE and use it.
llvm/CMakeLists.txt defines uppercase_CMAKE_BUILD_TYPE for regular LLVM
builds with OpenMP enabled.

[Nawrin]

LGTM

openmp/runtime/CMakeLists.txt

 if(${OPENMP_STANDALONE_BUILD})
   # If adding a new architecture, take a look at cmake/LibompGetArchitecture.cmake
   libomp_get_architecture(LIBOMP_DETECTED_ARCH)
   set(LIBOMP_ARCH ${LIBOMP_DETECTED_ARCH} CACHE STRING
     "The architecture to build for (x86_64/i386/arm/ppc64/ppc64le/aarch64/mic/mips/mips64/riscv64).")
   # Should assertions be enabled?  They are on by default.
   set(LIBOMP_ENABLE_ASSERTIONS TRUE CACHE BOOL
     "enable assertions?")
+  string(TOUPPER "${CMAKE_BUILD_TYPE}" uppercase_CMAKE_BUILD_TYPE)
 else() # Part of LLVM build
   # Determine the native architecture from LLVM.
   string(TOLOWER "${LLVM_TARGET_ARCH}" LIBOMP_NATIVE_ARCH)
   if( LIBOMP_NATIVE_ARCH STREQUAL "host" )
     string(REGEX MATCH "^[^-]*" LIBOMP_NATIVE_ARCH ${LLVM_HOST_TRIPLE})
   endif ()
   if(LIBOMP_NATIVE_ARCH MATCHES "i[2-6]86")
     set(LIBOMP_ARCH i386)
elseif("${LIBOMP_ARCH}" STREQUAL "riscv64") # RISCV64 architecture
     set(RISCV64 TRUE)
 endif()
 
 # Set some flags based on build_type
 set(RELEASE_BUILD FALSE)
 set(DEBUG_BUILD FALSE)
 set(RELWITHDEBINFO_BUILD FALSE)
 set(MINSIZEREL_BUILD FALSE)
-string(TOLOWER "${CMAKE_BUILD_TYPE}" libomp_build_type_lowercase)
-if("${libomp_build_type_lowercase}" STREQUAL "release")
+if("${uppercase_CMAKE_BUILD_TYPE}" STREQUAL "RELEASE")
   set(RELEASE_BUILD TRUE)
-elseif("${libomp_build_type_lowercase}" STREQUAL "debug")
+elseif("${uppercase_CMAKE_BUILD_TYPE}" STREQUAL "DEBUG")
   set(DEBUG_BUILD TRUE)
-elseif("${libomp_build_type_lowercase}" STREQUAL "relwithdebinfo")
+elseif("${uppercase_CMAKE_BUILD_TYPE}" STREQUAL "RELWITHDEBINFO")
   set(RELWITHDEBINFO_BUILD TRUE)
-elseif("${libomp_build_type_lowercase}" STREQUAL "minsizerel")
+elseif("${uppercase_CMAKE_BUILD_TYPE}" STREQUAL "MINSIZEREL")
   set(MINSIZEREL_BUILD TRUE)
 endif()
 
 # Include itt notify interface?
 set(LIBOMP_USE_ITT_NOTIFY TRUE CACHE BOOL
   "Enable ITT notify?")
 
 # normal, profile, stubs library.