llvm-project/clang/test/Preprocessor/extension-warning.c

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// RUN: clang -fsyntax-only -verify -pedantic %s
// The preprocessor shouldn't warn about extensions within macro bodies that
// aren't expanded.
#define __block __attribute__((__blocks__(byref)))
// This warning is entirely valid.
__block int x; // expected-warning{{extension used}}
void whatever() {}