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-rw-r--r--Modules/CMakeDetermineCCompiler.cmake1
1 files changed, 1 insertions, 0 deletions
diff --git a/Modules/CMakeDetermineCCompiler.cmake b/Modules/CMakeDetermineCCompiler.cmake
index fcbda20fbd..4e56ce1cfb 100644
--- a/Modules/CMakeDetermineCCompiler.cmake
+++ b/Modules/CMakeDetermineCCompiler.cmake
@@ -110,6 +110,7 @@ if(NOT CMAKE_C_COMPILER_ID_RUN)
include(${CMAKE_ROOT}/Modules/CMakeDetermineCompilerId.cmake)
CMAKE_DETERMINE_COMPILER_ID(C CFLAGS CMakeCCompilerId.c)
+ CMAKE_DIAGNOSE_UNSUPPORTED_CLANG(C CC)
# Set old compiler and platform id variables.
if(CMAKE_C_COMPILER_ID STREQUAL "GNU")