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+[diff.cpp]
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+# Annex C (informative) Compatibility [[diff]](./#diff)
+
+## C.7 C++ and C [[diff.iso]](diff.iso#diff.cpp)
+
+### C.7.8 [[cpp]](cpp "15 Preprocessing directives"): preprocessing directives [diff.cpp]
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/compatibility.tex#L3661)
+
+**Affected subclause:** [[cpp.predefined]](cpp.predefined)  
+
+
+**Change:** Whether __STDC__ is defined and if so, what its value is, areimplementation-defined[.](#1.sentence-1)
+
+  
+
+
+**Rationale:** C++ is not identical to C[.](#1.sentence-2)
+
+Mandating that __STDC__ be defined would require that translators make an incorrect claim[.](#1.sentence-3)
+
+  
+
+
+**Effect on original feature:** Change to semantics of well-defined feature[.](#1.sentence-4)
+
+  
+
+
+**Difficulty of converting:** Semantic transformation[.](#1.sentence-5)
+
+  
+
+
+**How widely used:** Programs and headers that reference __STDC__ are
+quite common[.](#1.sentence-6)