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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
38 lines
1.7 KiB
C++
38 lines
1.7 KiB
C++
// RUN: %clang_cc1 %std_cxx98-14 -fsyntax-only -verify=expected,precxx17 -Wno-constant-conversion %s
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// RUN: %clang_cc1 %std_cxx98-14 -fsyntax-only -verify=expected,precxx17 -Wno-constant-conversion -Wno-deprecated -Wdeprecated-increment-bool %s
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// RUN: %clang_cc1 %std_cxx17- -fsyntax-only -verify=expected,cxx17 -Wno-constant-conversion -Wno-deprecated -Wdeprecated-increment-bool %s
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// Bool literals can be enum values.
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enum {
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ReadWrite = false,
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ReadOnly = true
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};
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// bool cannot be decremented, and gives a warning on increment
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void test(bool b)
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{
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++b; // precxx17-warning {{incrementing expression of type bool is deprecated}} \
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cxx17-error {{ISO C++17 does not allow incrementing expression of type bool}}
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b++; // precxx17-warning {{incrementing expression of type bool is deprecated}} \
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cxx17-error {{ISO C++17 does not allow incrementing expression of type bool}}
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--b; // expected-error {{cannot decrement expression of type bool}}
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b--; // expected-error {{cannot decrement expression of type bool}}
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bool *b1 = (int *)0; // expected-error{{cannot initialize}}
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}
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// static_assert_arg_is_bool(x) compiles only if x is a bool.
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template <typename T>
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void static_assert_arg_is_bool(T x) {
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bool* p = &x;
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}
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void test2() {
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int n = 2;
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static_assert_arg_is_bool(n && 4); // expected-warning {{use of logical '&&' with constant operand}} \
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// expected-note {{use '&' for a bitwise operation}} \
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// expected-note {{remove constant to silence this warning}}
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static_assert_arg_is_bool(n || 5); // expected-warning {{use of logical '||' with constant operand}} \
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// expected-note {{use '|' for a bitwise operation}}
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}
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