| // Test the __VA_ARGS__ comma swallowing extensions of various compiler dialects. |
| |
| // RUN: %clang_cc1 -E %s | FileCheck -check-prefix=GCC -strict-whitespace %s |
| // RUN: %clang_cc1 -E -std=c99 %s | FileCheck -check-prefix=C99 -strict-whitespace %s |
| // RUN: %clang_cc1 -E -std=c11 %s | FileCheck -check-prefix=C99 -strict-whitespace %s |
| // RUN: %clang_cc1 -E -x c++ %s | FileCheck -check-prefix=GCC -strict-whitespace %s |
| // RUN: %clang_cc1 -E -std=gnu99 %s | FileCheck -check-prefix=GCC -strict-whitespace %s |
| // RUN: %clang_cc1 -E -fms-compatibility %s | FileCheck -check-prefix=MS -strict-whitespace %s |
| // RUN: %clang_cc1 -E -DNAMED %s | FileCheck -check-prefix=GCC -strict-whitespace %s |
| // RUN: %clang_cc1 -E -std=c99 -DNAMED %s | FileCheck -check-prefix=C99 -strict-whitespace %s |
| |
| |
| #ifndef NAMED |
| # define A(...) [ __VA_ARGS__ ] |
| # define B(...) [ , __VA_ARGS__ ] |
| # define C(...) [ , ## __VA_ARGS__ ] |
| # define D(A,...) [ A , ## __VA_ARGS__ ] |
| # define E(A,...) [ __VA_ARGS__ ## A ] |
| #else |
| // These are the GCC named argument versions of the C99-style variadic macros. |
| // Note that __VA_ARGS__ *may* be used as the name, this is not prohibited! |
| # define A(__VA_ARGS__...) [ __VA_ARGS__ ] |
| # define B(__VA_ARGS__...) [ , __VA_ARGS__ ] |
| # define C(__VA_ARGS__...) [ , ## __VA_ARGS__ ] |
| # define D(A,__VA_ARGS__...) [ A , ## __VA_ARGS__ ] |
| # define E(A,__VA_ARGS__...) [ __VA_ARGS__ ## A ] |
| #endif |
| |
| |
| 1: A() B() C() D() E() |
| 2: A(a) B(a) C(a) D(a) E(a) |
| 3: A(,) B(,) C(,) D(,) E(,) |
| 4: A(a,b,c) B(a,b,c) C(a,b,c) D(a,b,c) E(a,b,c) |
| 5: A(a,b,) B(a,b,) C(a,b,) D(a,b,) |
| |
| // The GCC ", ## __VA_ARGS__" extension swallows the comma when followed by |
| // empty __VA_ARGS__. This extension does not apply in -std=c99 mode, but |
| // does apply in C++. |
| // |
| // GCC: 1: [ ] [ , ] [ ] [ ] [ ] |
| // GCC: 2: [ a ] [ , a ] [ ,a ] [ a ] [ a ] |
| // GCC: 3: [ , ] [ , , ] [ ,, ] [ , ] [ ] |
| // GCC: 4: [ a,b,c ] [ , a,b,c ] [ ,a,b,c ] [ a ,b,c ] [ b,ca ] |
| // GCC: 5: [ a,b, ] [ , a,b, ] [ ,a,b, ] [ a ,b, ] |
| |
| // Under C99 standard mode, the GCC ", ## __VA_ARGS__" extension *does not* |
| // swallow the comma when followed by empty __VA_ARGS__. |
| // |
| // C99: 1: [ ] [ , ] [ , ] [ ] [ ] |
| // C99: 2: [ a ] [ , a ] [ ,a ] [ a ] [ a ] |
| // C99: 3: [ , ] [ , , ] [ ,, ] [ , ] [ ] |
| // C99: 4: [ a,b,c ] [ , a,b,c ] [ ,a,b,c ] [ a ,b,c ] [ b,ca ] |
| // C99: 5: [ a,b, ] [ , a,b, ] [ ,a,b, ] [ a ,b, ] |
| |
| // Microsoft's extension is on ", __VA_ARGS__" (without explicit ##) where |
| // the comma is swallowed when followed by empty __VA_ARGS__. |
| // |
| // MS: 1: [ ] [ ] [ ] [ ] [ ] |
| // MS: 2: [ a ] [ , a ] [ ,a ] [ a ] [ a ] |
| // MS: 3: [ , ] [ , , ] [ ,, ] [ , ] [ ] |
| // MS: 4: [ a,b,c ] [ , a,b,c ] [ ,a,b,c ] [ a ,b,c ] [ b,ca ] |
| // MS: 5: [ a,b, ] [ , a,b, ] [ ,a,b, ] [ a ,b, ] |
| |
| // FIXME: Item 3(d) in MS output should be [ ] not [ , ] |
