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CMake provides "CrayClang" as a compiler ID for the C and CXX Cray compilers based on Clang:
https://cmake.org/cmake/help/latest/variable/CMAKE_LANG_COMPILER_ID.html
SetupCompilerOptions uses matches for Clang to match both Clang and AppleClang:
blt/cmake/SetupCompilerOptions.cmake
Line 33 in 45494b6
This causes BLT to erroneously classify CrayClang C and CrayClang CXX as Clang mainline rather than CrayClang.
This results in situations like this:
-- The Fortran compiler identification is Cray 18.0.0
-- The C compiler identification is Clang 18.1.6
-- The CXX compiler identification is Clang 18.1.6
When specifying the cray clang compilers in cmake for CMAKE_C_COMPILER and CMAKE_CXX_COMPILER.
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