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83ea47acd7
GCC from 11 onwards defaults to -std=gnu++17 for C++ source files. We want to do the same (https://discourse.llvm.org/t/c-objc-switch-to-gnu-17-as-the-default-dialect/64360). Split RUN lines, adjust `-verify`, or add `__cplusplus < 201703L` or `-Wno-dynamic-exception-spec`, so that tests will pass regardless of gnu++14/gnu++17 default. We have a desire to mark a test compatible with multiple language standards. There are ongoing discussions how to add markers in the long term: * https://discourse.llvm.org/t/iterating-lit-run-lines/62596 * https://discourse.llvm.org/t/lit-run-a-run-line-multiple-times-with-different-replacements/64932 As a workaround in the short term, add lit substitutions `%std_cxx98-`, `%std_cxx11-14`, etc. They can be used for tests which work across multiple language standards. If a range has `n` standards, run lit multiple times, with `LIT_CLANG_STD_GROUP=0`, `LIT_CLANG_STD_GROUP=1`, etc to cover all `n` standards. Reviewed By: #clang-language-wg, aaron.ballman Differential Revision: https://reviews.llvm.org/D131464
24 lines
1.3 KiB
C++
24 lines
1.3 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -verify=expected,precxx17,precxx20 %std_cxx98-14 %s
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// RUN: %clang_cc1 -fsyntax-only -verify=expected,cxx17,precxx20 -std=c++17 %s
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// RUN: %clang_cc1 -fsyntax-only -verify=expected,cxx20 %std_cxx20- %s
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template<typename T, T Value> struct Constant; // precxx17-note{{template parameter is declared here}} \
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// FIXME: bad location precxx20-error{{a non-type template parameter cannot have type 'float'}}
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Constant<int, 5> *c1;
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int x;
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float f(int, double);
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Constant<int&, x> *c2;
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Constant<int*, &x> *c3;
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Constant<float (*)(int, double), f> *c4;
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Constant<float (*)(int, double), &f> *c5;
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Constant<float (*)(int, int), f> *c6; // precxx17-error {{non-type template argument of type 'float (int, double)' cannot be converted to a value of type 'float (*)(int, int)'}} \
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cxx17-error {{value of type 'float (int, double)' is not implicitly convertible to 'float (*)(int, int)'}} \
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cxx20-error {{value of type 'float (int, double)' is not implicitly convertible to 'float (*)(int, int)'}}
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Constant<float, 0> *c7; // precxx20-note {{while substituting}} \
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cxx20-error {{conversion from 'int' to 'float' is not allowed in a converted constant expression}}
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