0801f41944
Since GCC 9, C++17 support is no longer experimental. It was too late to change the default C++ dialect to C++17 in GCC 10, but I think now it's time to pull the trigger (C++14 was made the default in GCC 6.1). We're still missing two C++17 library features, but that shouldn't stop us. See <https://gcc.gnu.org/onlinedocs/libstdc++/manual/status.html#status.iso.2017> and <https://gcc.gnu.org/projects/cxx-status.html#cxx17> for the C++17 status. I won't list all C++17 features here, but just a few heads-up: - trigraphs were removed (hardly anyone cares, unless your keyboard is missing the # key), - operator++(bool) was removed (so some tests now run in C++14 and down only), - the keyword register was removed (some legacy code might trip on this), - noexcept specification is now part of the type system and C++17 does not allow dynamic exception specifications anymore (the empty throw specification is still available, but it is deprecated), - the evaluation order rules are different in C++17, - static constexpr data members are now implicitly inline (which makes them definitions), - C++17 requires guaranteed copy elision, meaning that a copy/move constructor call might be elided completely. That means that if something relied on a constructor being instantiated via e.g. copying a function parameter, it might now fail. I'll post an update for cxx-status.html and add a new caveat to changes.html once this is in. gcc/ChangeLog: * doc/invoke.texi (C Dialect Options): Adjust -std default for C++. * doc/standards.texi (C Language): Correct the default dialect. (C++ Language): Update the default for C++ to gnu++17. gcc/c-family/ChangeLog: * c-opts.c (c_common_init_options): Default to gnu++17. gcc/testsuite/ChangeLog: * c-c++-common/torture/vector-subscript-3.c: In C++17, define away the keyword register. * g++.dg/cpp1z/attributes-enum-1a.C: Only run pre-C++17. * g++.dg/cpp1z/fold7a.C: Likewise. * g++.dg/cpp1z/nontype3a.C: Likewise. * g++.dg/cpp1z/utf8-2a.C: Likewise. * g++.dg/parse/error11.C: Update expected diagnostics for C++17. * g++.dg/torture/pr34850.C: Add -Wno-attribute-warning. * g++.dg/torture/pr49394.C: In C++17, use noexcept(false). * g++.dg/torture/pr82154.C: Use -std=c++14. * lib/target-supports.exp: Set to C++17. * obj-c++.dg/try-catch-9.mm: Use -Wno-register. libgomp/ChangeLog: * testsuite/libgomp.c++/atomic-3.C: Use -std=gnu++14.
77 lines
1.1 KiB
C
77 lines
1.1 KiB
C
// { dg-do run }
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// C++17 forbids ++ on bool.
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// { dg-options "-Wno-deprecated -std=gnu++14" }
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extern "C" void abort (void);
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bool v, x1, x2, x3, x4, x5, x6;
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void
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foo ()
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{
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#pragma omp atomic capture
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v = ++x1;
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if (!v)
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abort ();
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#pragma omp atomic capture
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v = x2++;
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if (v)
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abort ();
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#pragma omp atomic read
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v = x3;
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if (!v)
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abort ();
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#pragma omp atomic read
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v = x4;
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if (!v)
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abort ();
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#pragma omp atomic capture
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{ v = x5; x5 |= 1; }
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if (v)
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abort ();
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#pragma omp atomic capture
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{ x6 |= 1; v = x6; }
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if (!v)
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abort ();
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}
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void
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bar ()
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{
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#pragma omp atomic write
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x1 = false;
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#pragma omp atomic write
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x2 = false;
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#pragma omp atomic capture
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{ ++x1; v = x1; }
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if (!v)
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abort ();
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#pragma omp atomic capture
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{ v = x2; x2++; }
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if (v)
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abort ();
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#pragma omp atomic write
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x1 = false;
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#pragma omp atomic write
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x2 = false;
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#pragma omp atomic capture
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{ x1++; v = x1; }
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if (!v)
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abort ();
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#pragma omp atomic capture
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{ v = x2; ++x2; }
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if (v)
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abort ();
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}
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int
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main ()
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{
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#pragma omp atomic write
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x3 = true;
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#pragma omp atomic write
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x4 = true;
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foo ();
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bar ();
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return 0;
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}
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