60 lines
3.5 KiB
C
60 lines
3.5 KiB
C
// RUN: %clang_cc1 -std=c2x -fsyntax-only -Wpre-c2x-compat -verify=compat %s
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// RUN: %clang_cc1 -std=c17 -fsyntax-only -pedantic -Wno-comment -verify=pedantic %s
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/* WG14 N2900: yes
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* Consistent, Warningless, and Intuitive Initialization with {}
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*/
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/* WG14 N3011: yes
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* Consistent, Warningless, and Intuitive Initialization with {}
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*/
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void test(void) {
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struct S { int x, y; } s = {}; // compat-warning {{use of an empty initializer is incompatible with C standards before C23}} \
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pedantic-warning {{use of an empty initializer is a C23 extension}}
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int i = {}; // compat-warning {{use of an empty initializer is incompatible with C standards before C23}} \
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pedantic-warning {{use of an empty initializer is a C23 extension}}
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int j = (int){}; // compat-warning {{use of an empty initializer is incompatible with C standards before C23}} \
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pedantic-warning {{use of an empty initializer is a C23 extension}}
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// C2x 6.7.10p4 says, in part: An array of unknown size shall not be
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// initialized by an empty initializer.
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// However, Clang allows zero-sized arrays as an extension in both C and C++,
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// and this initialization form will deduce the array extent as zero. Given
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// that we support empty initialization of an unbounded array in C++, we also
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// support it in C.
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int unknown_size[] = {}; // pedantic-warning {{zero size arrays are an extension}} \
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pedantic-warning {{use of an empty initializer is a C23 extension}} \
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compat-warning {{use of an empty initializer is incompatible with C standards before C23}}
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int vla[i] = {}; // compat-warning {{use of an empty initializer is incompatible with C standards before C23}} \
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pedantic-warning {{use of an empty initializer is a C23 extension}}
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int *compound_literal_vla = (int[i]){}; // compat-warning {{use of an empty initializer is incompatible with C standards before C23}} \
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pedantic-warning {{use of an empty initializer is a C23 extension}}
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struct T {
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int i;
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struct S s;
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} t1 = { 1, {} }; // compat-warning {{use of an empty initializer is incompatible with C standards before C23}} \
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pedantic-warning {{use of an empty initializer is a C23 extension}}
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struct T t2 = {
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1, {
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2, {} // compat-warning {{use of an empty initializer is incompatible with C standards before C23}} \
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pedantic-warning {{use of an empty initializer is a C23 extension}}
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}
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};
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struct T t3 = {
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(int){}, // compat-warning {{use of an empty initializer is incompatible with C standards before C23}} \
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pedantic-warning {{use of an empty initializer is a C23 extension}}
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{} // compat-warning {{use of an empty initializer is incompatible with C standards before C23}} \
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pedantic-warning {{use of an empty initializer is a C23 extension}}
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};
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// Ensure that zero initialization does what you'd expect in a constant expr.
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// FIXME: the "not an ICE" warning is incorrect for C2x, but we don't yet
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// implement WG14 N3038.
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_Static_assert((int){} == 0, "what?"); // compat-warning {{use of an empty initializer is incompatible with C standards before C23}} \
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pedantic-warning {{use of an empty initializer is a C23 extension}} \
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pedantic-warning {{expression is not an integer constant expression; folding it to a constant is a GNU extension}}
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}
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