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).
50 lines
2.9 KiB
C
50 lines
2.9 KiB
C
// RUN: %clang_cc1 -std=c11 -fsyntax-only -verify %s
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// RUN: %clang_cc1 -std=c99 -pedantic -fsyntax-only -verify=expected,ext %s
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void g(void);
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void foo(int n) {
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(void) _Generic(0, // ext-warning {{'_Generic' is a C11 extension}}
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struct A: 0, // expected-error {{type 'struct A' in generic association incomplete}}
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void(): 0, // expected-error {{type 'void ()' in generic association not an object type}}
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int[n]: 0); // expected-error {{type 'int[n]' in generic association is a variably modified type}}
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(void) _Generic(0, // ext-warning {{'_Generic' is a C11 extension}}
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void (*)(): 0, // expected-note {{compatible type 'void (*)()' specified here}}
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void (*)(void): 0); // expected-error {{type 'void (*)(void)' in generic association compatible with previously specified type 'void (*)()'}}
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(void) _Generic((void (*)()) 0, // expected-error {{controlling expression type 'void (*)()' compatible with 2 generic association types}} \
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// ext-warning {{'_Generic' is a C11 extension}}
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void (*)(int): 0, // expected-note {{compatible type 'void (*)(int)' specified here}}
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void (*)(void): 0); // expected-note {{compatible type 'void (*)(void)' specified here}}
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(void) _Generic(0, // expected-error {{controlling expression type 'int' not compatible with any generic association type}} \
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// ext-warning {{'_Generic' is a C11 extension}}
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char: 0, short: 0, long: 0);
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int a1[_Generic(0, int: 1, short: 2, float: 3, default: 4) == 1 ? 1 : -1]; // ext-warning {{'_Generic' is a C11 extension}}
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int a2[_Generic(0, default: 1, short: 2, float: 3, int: 4) == 4 ? 1 : -1]; // ext-warning {{'_Generic' is a C11 extension}}
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int a3[_Generic(0L, int: 1, short: 2, float: 3, default: 4) == 4 ? 1 : -1]; // ext-warning {{'_Generic' is a C11 extension}}
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int a4[_Generic(0L, default: 1, short: 2, float: 3, int: 4) == 1 ? 1 : -1]; // ext-warning {{'_Generic' is a C11 extension}}
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int a5[_Generic(0, int: 1, short: 2, float: 3) == 1 ? 1 : -1]; // ext-warning {{'_Generic' is a C11 extension}}
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int a6[_Generic(0, short: 1, float: 2, int: 3) == 3 ? 1 : -1]; // ext-warning {{'_Generic' is a C11 extension}}
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int a7[_Generic("test", char *: 1, default: 2) == 1 ? 1 : -1]; // ext-warning {{'_Generic' is a C11 extension}}
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int a8[_Generic(g, void (*)(void): 1, default: 2) == 1 ? 1 : -1]; // ext-warning {{'_Generic' is a C11 extension}}
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const int i = 12;
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int a9[_Generic(i, int: 1, default: 2) == 1 ? 1 : -1]; // ext-warning {{'_Generic' is a C11 extension}}
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// This is expected to not trigger any diagnostics because the controlling
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// expression is not evaluated.
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(void)_Generic(*(int *)0, int: 1); // ext-warning {{'_Generic' is a C11 extension}}
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}
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int __attribute__((overloadable)) test (int);
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double __attribute__((overloadable)) test (double);
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char testc(char);
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void PR30201(void) {
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_Generic(4, char:testc, default:test)(4); // ext-warning {{'_Generic' is a C11 extension}}
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}
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