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571df35397
is empty in a variadic macro expansion. This fixes a divergence in support for the ", ## __VA_ARGS__" GCC extension which differed in behaviour when in strict C99 mode (note: there is no change in behaviour has been made in the gnu99 mode that clang uses by default). In addition, there is improved support for the Microsoft alternative extension ", __VA_ARGS__". llvm-svn: 167613
65 lines
2.8 KiB
C
65 lines
2.8 KiB
C
// Test the __VA_ARGS__ comma swallowing extensions of various compiler dialects.
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// RUN: %clang_cc1 -E %s | FileCheck -check-prefix=GCC -strict-whitespace %s
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// RUN: %clang_cc1 -E -std=c99 %s | FileCheck -check-prefix=C99 -strict-whitespace %s
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// RUN: %clang_cc1 -E -std=c11 %s | FileCheck -check-prefix=C99 -strict-whitespace %s
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// RUN: %clang_cc1 -E -x c++ %s | FileCheck -check-prefix=GCC -strict-whitespace %s
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// RUN: %clang_cc1 -E -std=gnu99 %s | FileCheck -check-prefix=GCC -strict-whitespace %s
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// RUN: %clang_cc1 -E -fms-compatibility %s | FileCheck -check-prefix=MS -strict-whitespace %s
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// RUN: %clang_cc1 -E -DNAMED %s | FileCheck -check-prefix=GCC -strict-whitespace %s
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// RUN: %clang_cc1 -E -std=c99 -DNAMED %s | FileCheck -check-prefix=C99 -strict-whitespace %s
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#ifndef NAMED
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# define A(...) [ __VA_ARGS__ ]
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# define B(...) [ , __VA_ARGS__ ]
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# define C(...) [ , ## __VA_ARGS__ ]
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# define D(A,...) [ A , ## __VA_ARGS__ ]
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# define E(A,...) [ __VA_ARGS__ ## A ]
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#else
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// These are the GCC named argument versions of the C99-style variadic macros.
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// Note that __VA_ARGS__ *may* be used as the name, this is not prohibited!
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# define A(__VA_ARGS__...) [ __VA_ARGS__ ]
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# define B(__VA_ARGS__...) [ , __VA_ARGS__ ]
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# define C(__VA_ARGS__...) [ , ## __VA_ARGS__ ]
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# define D(A,__VA_ARGS__...) [ A , ## __VA_ARGS__ ]
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# define E(A,__VA_ARGS__...) [ __VA_ARGS__ ## A ]
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#endif
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1: A() B() C() D() E()
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2: A(a) B(a) C(a) D(a) E(a)
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3: A(,) B(,) C(,) D(,) E(,)
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4: A(a,b,c) B(a,b,c) C(a,b,c) D(a,b,c) E(a,b,c)
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5: A(a,b,) B(a,b,) C(a,b,) D(a,b,)
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// The GCC ", ## __VA_ARGS__" extension swallows the comma when followed by
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// empty __VA_ARGS__. This extension does not apply in -std=c99 mode, but
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// does apply in C++.
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//
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// GCC: 1: [ ] [ , ] [ ] [ ] [ ]
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// GCC: 2: [ a ] [ , a ] [ ,a ] [ a ] [ a ]
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// GCC: 3: [ , ] [ , , ] [ ,, ] [ , ] [ ]
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// GCC: 4: [ a,b,c ] [ , a,b,c ] [ ,a,b,c ] [ a ,b,c ] [ b,ca ]
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// GCC: 5: [ a,b, ] [ , a,b, ] [ ,a,b, ] [ a ,b, ]
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// Under C99 standard mode, the GCC ", ## __VA_ARGS__" extension *does not*
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// swallow the comma when followed by empty __VA_ARGS__.
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//
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// C99: 1: [ ] [ , ] [ , ] [ ] [ ]
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// C99: 2: [ a ] [ , a ] [ ,a ] [ a ] [ a ]
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// C99: 3: [ , ] [ , , ] [ ,, ] [ , ] [ ]
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// C99: 4: [ a,b,c ] [ , a,b,c ] [ ,a,b,c ] [ a ,b,c ] [ b,ca ]
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// C99: 5: [ a,b, ] [ , a,b, ] [ ,a,b, ] [ a ,b, ]
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// Microsoft's extension is on ", __VA_ARGS__" (without explicit ##) where
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// the comma is swallowed when followed by empty __VA_ARGS__.
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//
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// MS: 1: [ ] [ ] [ ] [ ] [ ]
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// MS: 2: [ a ] [ , a ] [ ,a ] [ a ] [ a ]
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// MS: 3: [ , ] [ , , ] [ ,, ] [ , ] [ ]
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// MS: 4: [ a,b,c ] [ , a,b,c ] [ ,a,b,c ] [ a ,b,c ] [ b,ca ]
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// MS: 5: [ a,b, ] [ , a,b, ] [ ,a,b, ] [ a ,b, ]
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// FIXME: Item 3(d) in MS output should be [ ] not [ , ]
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