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// RUN: %clang_cc1 %s -Eonly -Werror=undef -verify
extern int x;
#if foo // expected-error {{'foo' is not defined, evaluates to 0}}
#endif
// expected-warning@+2 {{use of a '#elifdef' directive is a C23 extension}}
#ifdef foo
#elifdef foo
#endif
#if defined(foo)
#endif
// PR3938
// expected-warning@+3 {{use of a '#elifdef' directive is a C23 extension}}
#if 0
#ifdef D
#elifdef D
#else 1 // Should not warn due to C99 6.10p4
#endif
#endif
#if 0
#else 1 // expected-warning {{extra tokens}}
#endif
// PR6852
#if 'somesillylongthing' // expected-warning {{character constant too long for its type}} \
// expected-warning {{multi-character character constant}}
#endif
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