1// RUN: %clang_cc1 %s -verify -fsyntax-only -pedantic
2
3// This file tests the clang extension which allows initializing the components
4// of a complex number individually using an initialization list. Basically,
5// if you have an explicit init list for a complex number that contains two
6// initializers, this extension kicks in to turn it into component-wise
7// initialization.
8//
9// This extension is useful because there isn't any way to accurately build
10// a complex number at the moment besides setting the components with
11// __real__ and __imag__, which is inconvenient and not usable for constants.
12// (Of course, there are other extensions we could implement that would
13// allow this, like some sort of __builtin_build_complex.)
14//
15// FIXME: It would be a good idea to have a warnings for implicit
16// real->complex and complex->real conversions; as-is, it's way too easy
17// to get implicit conversions when they are not intended.
18
19// Basic testcase
20_Complex float valid1 = { 1.0f, 2.0f }; // expected-warning {{specifying real and imaginary components is an extension}}
21
22
23// Struct for nesting tests
24struct teststruct { _Complex float x; };
25
26
27// Random other valid stuff
28_Complex int valid2 = { 1, 2 }; // expected-warning {{complex integer}} expected-warning {{specifying real and imaginary components is an extension}}
29struct teststruct valid3 = { { 1.0f, 2.0f} }; // expected-warning {{specifying real and imaginary components is an extension}}
30_Complex float valid4[2] = { {1.0f, 1.0f}, {1.0f, 1.0f} }; // expected-warning 2 {{specifying real and imaginary components is an extension}}
31// FIXME: We need some sort of warning for valid5
32_Complex float valid5 = {1.0f, 1.0fi}; // expected-warning {{imaginary constants}} expected-warning {{specifying real and imaginary components is an extension}}
33
34
35// Random invalid stuff
36struct teststruct invalid1 = { 1, 2 }; // expected-warning {{excess elements}}
37_Complex float invalid2 = { 1, 2, 3 }; // expected-warning {{excess elements}}
38_Complex float invalid3 = {}; // expected-error {{scalar initializer cannot be empty}} expected-warning {{GNU empty initializer}}
39
40
41// Check incomplete array sizing
42_Complex float sizetest1[] = { {1.0f, 1.0f}, {1.0f, 1.0f} }; // expected-warning 2 {{specifying real and imaginary components is an extension}}
43_Complex float sizecheck1[(sizeof(sizetest1) == sizeof(*sizetest1)*2) ? 1 : -1];
44_Complex float sizetest2[] = { 1.0f, 1.0f, {1.0f, 1.0f} };  // expected-warning {{specifying real and imaginary components is an extension}}
45_Complex float sizecheck2[(sizeof(sizetest2) == sizeof(*sizetest2)*3) ? 1 : -1];
46
47// Constant-folding with init list.
48_Complex float x = 2 + (_Complex float) { 1, 2 };  // expected-warning {{specifying real and imaginary components is an extension}}
49