27a972a699
(This relands 59337263ab and makes sure comma operator
diagnostics are suppressed in a SFINAE context.)
While at it, add the diagnosis message "left operand of comma operator has no effect" (used by GCC) for comma operator.
This also makes Clang diagnose in the constant evaluation context which aligns with GCC/MSVC behavior. (https://godbolt.org/z/7zxb8Tx96)
Reviewed By: aaron.ballman
Differential Revision: https://reviews.llvm.org/D103938
18 lines
860 B
C
18 lines
860 B
C
// RUN: %clang_cc1 %s -verify -fsyntax-only -pedantic
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// Check that we don't crash trying to emit warnings in a potentially-evaluated
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// sizeof or typeof. (This test needs to be in a separate file because we use
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// a different codepath when we have already emitted an error.)
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int PotentiallyEvaluatedSizeofWarn(int n) {
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return (int)sizeof *(0 << 32,(int(*)[n])0); // expected-warning {{left operand of comma operator has no effect}} expected-warning {{shift count >= width of type}}
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}
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void PotentiallyEvaluatedTypeofWarn(int n) {
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__typeof(*(0 << 32,(int(*)[n])0)) x; // expected-warning {{left operand of comma operator has no effect}} expected-warning {{shift count >= width of type}}
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(void)x;
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}
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void PotentiallyEvaluatedArrayBoundWarn(int n) {
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(void)*(int(*)[(0 << 32,n)])0; // expected-warning {{left operand of comma operator has no effect}}
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}
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