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-rw-r--r--Modules/Compiler/XL-C.cmake2
1 files changed, 2 insertions, 0 deletions
diff --git a/Modules/Compiler/XL-C.cmake b/Modules/Compiler/XL-C.cmake
index 2077bdabdf..78c44d5d72 100644
--- a/Modules/Compiler/XL-C.cmake
+++ b/Modules/Compiler/XL-C.cmake
@@ -6,6 +6,8 @@ string(APPEND CMAKE_C_FLAGS_MINSIZEREL_INIT " -DNDEBUG")
# -qthreaded = Ensures that all optimizations will be thread-safe
string(APPEND CMAKE_C_FLAGS_INIT " -qthreaded")
+set(CMAKE_C_COMPILE_OPTIONS_EXPLICIT_LANGUAGE -qsourcetype=c)
+
if (CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 10.1)
set(CMAKE_C90_STANDARD_COMPILE_OPTION "-qlanglvl=stdc89")
set(CMAKE_C90_EXTENSION_COMPILE_OPTION "-qlanglvl=extc89")