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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
26 lines
1.1 KiB
C++
26 lines
1.1 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -verify=expected,precxx17 %std_cxx98-14 %s
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// RUN: %clang_cc1 -fsyntax-only -verify=expected,cxx17 %std_cxx17- %s
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template<typename T,
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int I,
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template<typename> class TT>
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class A; // precxx17-note 3 {{template is declared here}} \
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cxx17-note 2 {{template is declared here}} \
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cxx17-note {{candidate template ignored: couldn't infer template argument 'T'}} \
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cxx17-note {{candidate function template not viable: requires 1 argument, but 0 were provided}}
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template<typename> class X;
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A<int, 0, X> * a1;
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A<float, 1, X, double> *a2; // expected-error{{too many template arguments for class template 'A'}}
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A<float, 1> *a3; // expected-error{{too few template arguments for class template 'A'}}
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A a4; // precxx17-error{{use of class template 'A' requires template arguments}} \
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cxx17-error{{no viable constructor or deduction guide for deduction of template arguments of 'A'}}
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namespace test0 {
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template <class t> class foo {};
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template <class t> class bar {
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bar(::test0::foo<tee> *ptr) {} // expected-error {{use of undeclared identifier 'tee'}}
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};
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}
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