clang/test/Sema/complex-init-list.c

   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
  24 struct teststruct { _Complex float x; };
  25
  26
  27 // Random other valid stuff
  28 _Complex int valid2 = { 1, 2 }; // expected-warning {{complex integer}} \
  29                                //  expected-warning {{specifying real and imaginary components is an extension}}
  30 struct teststruct valid3 = { { 1.0f, 2.0f} }; // expected-warning {{specifying real and imaginary components is an extension}}
  31 _Complex float valid4[2] = { {1.0f, 1.0f}, {1.0f, 1.0f} }; // expected-warning 2 {{specifying real and imaginary components is an extension}}
  32 // FIXME: We need some sort of warning for valid5
  33 _Complex float valid5 = {1.0f, 1.0fi}; // expected-warning {{imaginary constants}} \
  34                                        // expected-warning {{specifying real and imaginary components is an extension}}
  35
  36
  37 // Random invalid stuff
  38 struct teststruct invalid1 = { 1, 2 }; // expected-warning {{excess elements}}
  39 _Complex float invalid2 = { 1, 2, 3 }; // expected-warning {{specifying real and imaginary components is an extension}} \
  40                                        // expected-warning {{excess elements in scalar initializer}}
  41 _Complex float invalid3 = {}; // expected-warning {{use of an empty initializer is a C23 extension}}
  42
  43
  44 // Check incomplete array sizing
  45 _Complex float sizetest1[] = { {1.0f, 1.0f}, {1.0f, 1.0f} }; // expected-warning 2 {{specifying real and imaginary components is an extension}}
  46 _Complex float sizecheck1[(sizeof(sizetest1) == sizeof(*sizetest1)*2) ? 1 : -1];
  47 _Complex float sizetest2[] = { 1.0f, 1.0f, {1.0f, 1.0f} };  // expected-warning {{specifying real and imaginary components is an extension}}
  48 _Complex float sizecheck2[(sizeof(sizetest2) == sizeof(*sizetest2)*3) ? 1 : -1];
  49
  50 // Constant-folding with init list.
  51 _Complex float x = 2 + (_Complex float) { 1, 2 };  // expected-warning {{specifying real and imaginary components is an extension}}
  52
  53 // initialization list
  54 _Complex double cd = {1.0, 2.0, 3.0}; // expected-warning {{specifying real and imaginary components is an extension}} \
  55                                      //  expected-warning {{excess elements in scalar initializer}}
  56 _Complex float cf = {1.1f, 2.2f, 3.3f, 4.4f}; // expected-warning {{specifying real and imaginary components is an extension}} \
  57                                              //  expected-warning {{excess elements in scalar initializer}}