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aee4925507
Based on post-commit review discussion on 2bd84938470bf2e337801faafb8a67710f46429d with Richard Smith. Other uses of forcing HasEmptyPlaceHolder to false seem OK to me - they're all around pointer/reference types where the pointer/reference token will appear at the rightmost side of the left side of the type name, so they make nested types (eg: the "int" in "int *") behave as though there is a non-empty placeholder (because the "*" is essentially the placeholder as far as the "int" is concerned). This was originally committed in 277623f4d5a672d707390e2c3eaf30a9eb4b075c Reverted in f9ad1d1c775a8e264bebc15d75e0c6e5c20eefc7 due to breakages outside of clang - lldb seems to have some strange/strong dependence on "char [N]" versus "char[N]" when printing strings (not due to that name appearing in DWARF, but probably due to using clang to stringify type names) that'll need to be addressed, plus a few other odds and ends in other subprojects (clang-tools-extra, compiler-rt, etc).
60 lines
2.4 KiB
C++
60 lines
2.4 KiB
C++
// RUN: %clang_cc1 -std=gnu++17 -fsyntax-only -fms-compatibility -verify %s
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void f() {
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// GNU-style attributes are prohibited in this position.
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auto P = new int * __attribute__((vector_size(8))); // expected-error {{an attribute list cannot appear here}} \
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// expected-error {{invalid vector element type 'int *'}}
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// Ensure that MS type attribute keywords are still supported in this
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// position.
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auto P2 = new int * __sptr; // Ok
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}
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void g(int a[static [[]] 5]); // expected-error {{static array size is a C99 feature, not permitted in C++}}
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template<typename T> struct A {
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int x[sizeof(T)] __attribute((vector_size(8))); // expected-error {{invalid vector element type 'int[sizeof(T)]'}}
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};
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typedef int myvect[4] __attribute__((vector_size(16))); // expected-error {{invalid vector element type 'int[4]'}}
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void foo(myvect *in, myvect *out) { (*out)[0] = (*in)[0]; }
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namespace {
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class B {
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public:
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virtual void test() {}
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virtual void test2() {}
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virtual void test3() {}
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};
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class D : public B {
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public:
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void test() __attribute__((deprecated)) final {} // expected-warning {{GCC does not allow an attribute in this position on a function declaration}}
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void test2() [[]] override {} // Ok
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void test3() __attribute__((cf_unknown_transfer)) override {} // Ok, not known to GCC.
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};
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}
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template<typename T>
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union Tu { T b; } __attribute__((transparent_union)); // expected-warning {{'transparent_union' attribute ignored}}
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template<typename T>
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union Tu2 { int x; T b; } __attribute__((transparent_union)); // expected-warning {{'transparent_union' attribute ignored}}
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union Tu3 { int x; } __attribute((transparent_union)); // expected-warning {{'transparent_union' attribute ignored}}
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void tuTest1(Tu<int> u); // expected-note {{candidate function not viable: no known conversion from 'int' to 'Tu<int>' for 1st argument}}
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void tuTest2(Tu3 u); // expected-note {{candidate function not viable: no known conversion from 'int' to 'Tu3' for 1st argument}}
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void tu() {
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int x = 2;
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tuTest1(x); // expected-error {{no matching function for call to 'tuTest1'}}
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tuTest2(x); // expected-error {{no matching function for call to 'tuTest2'}}
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}
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[[gnu::__const__]] int f2() { return 12; }
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[[__gnu__::__const__]] int f3() { return 12; }
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[[using __gnu__ : __const__]] int f4() { return 12; }
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static_assert(__has_cpp_attribute(gnu::__const__));
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static_assert(__has_cpp_attribute(__gnu__::__const__));
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