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+CFLAGS
+------
+
+Default compilation flags to be used when compiling ``C`` files. Will only be
+used by CMake on the first configuration to determine ``CC`` default compilation
+flags, after which the value for ``CFLAGS`` is stored in the cache
+as :variable:`CMAKE_C_FLAGS <CMAKE_<LANG>_FLAGS>`. For any configuration run
+(including the first), the environment variable will be ignored if the
+:variable:`CMAKE_C_FLAGS <CMAKE_<LANG>_FLAGS>` variable is defined.