bf7e2b81e7
Fixes #178098 --- This patch addressed the issue when `__has_cpp_attribute` is expanded with incomplete scoped attributes. The scoped name parsing can lex to `eof`/`eod` at3f5a5d45d1/clang/lib/Lex/PPMacroExpansion.cpp (L1877-L1881)and then proceed with3f5a5d45d1/clang/lib/Lex/PPMacroExpansion.cpp (L1425-L1430)since `eof`/`eod` is not guarded at3f5a5d45d1/clang/lib/Lex/PPMacroExpansion.cpp (L1367-L1372)this could lead to a preprocessor crash3f5a5d45d1/clang/lib/Lex/PPMacroExpansion.cpp (L1370)
34 lines
1.6 KiB
C++
34 lines
1.6 KiB
C++
// RUN: %clang_cc1 -triple i386-unknown-unknown -Eonly -verify %s
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// We warn users if they write an attribute like
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// [[__clang__::fallthrough]] because __clang__ is a macro that expands to 1.
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// Instead, we suggest users use [[_Clang::fallthrough]] in this situation.
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// However, because __has_cpp_attribute (and __has_c_attribute) require
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// expanding their argument tokens, __clang__ expands to 1 in the feature test
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// macro as well. We don't currently give users a kind warning in this case,
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// but we previously did not expand macros and so this would return 0. Now that
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// we properly expand macros, users will now get an error about using incorrect
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// syntax.
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__has_cpp_attribute(__clang__::fallthrough) // expected-error {{missing ')' after <numeric_constant>}} \
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// expected-note {{to match this '('}} \
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// expected-error {{builtin feature check macro requires a parenthesized identifier}}
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namespace GH178098 {
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// expected-error@+2 {{builtin feature check macro requires a parenthesized identifier}}
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// expected-error@+1 {{expected value in expression}}
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#if __has_cpp_attribute(clang::
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#endif
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// expected-error@+4 {{unterminated function-like macro invocation}}
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// expected-error@+3 {{missing ')' after 'clang'}}
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// expected-error@+2 {{expected value in expression}}
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// expected-note@+1 {{to match this '('}}
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#if __has_attribute(clang::
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#endif
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// expected-error@+3 {{builtin feature check macro requires a parenthesized identifier}}
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// expected-error@+2 {{unterminated function-like macro invocation}}
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__has_cpp_attribute(clang::
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}
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