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A user reported an issue to me via email that Clang was accepting some code that GCC was rejecting. After investigation, it turned out to be a general problem of us failing to properly reject attributes written in the type position in C when they don't apply to types. The root cause was a terminology issue -- we sometimes use "CXX11Attr" to mean [[]] in C++11 mode and sometimes [[]] in general -- and this came back to bite us because in this particular case, it really meant [[]] in C++ mode. I fixed the issue by introducing a new function AttributeCommonInfo::isStandardAttributeSyntax() to represent [[]] in either C or C++ mode. This fix pointed out that we've had the issue in some of our existing tests, which have all been corrected. This resolves https://bugs.llvm.org/show_bug.cgi?id=50954.
16 lines
429 B
C
16 lines
429 B
C
// RUN: %clang_cc1 -fsyntax-only -Wunused -std=c2x -verify %s
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struct [[maybe_unused]] S1 { // ok
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int a [[maybe_unused]];
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};
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struct [[maybe_unused, maybe_unused]] S2 { // ok
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int a;
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};
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struct [[maybe_unused("Wrong")]] S3 { // expected-error {{'maybe_unused' cannot have an argument list}}
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int a;
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};
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void func(void) {
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int a[10] [[maybe_unused]]; // expected-error {{'maybe_unused' attribute cannot be applied to types}}
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}
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