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llvm-project/clang/test/Preprocessor/macro_paste_empty.c

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[Preprocessor] Prevent expansion of y in x ## y when x is empty When x is empty, x ## is suppressed, and when y gets expanded, the fact that it follows ## is not available in the macro expansion result. The macro definition can be checked instead, the ## will be available there regardless of what x expands to. Fixes http://llvm.org/PR12767 Patch by Harald van Dijk! llvm-svn: 182699
2013-05-25 09:35:18 +08:00
// RUN: %clang_cc1 -E %s | FileCheck --strict-whitespace %s
Add test for pasting empty formals llvm-svn: 38763
2006-07-28 13:13:36 +08:00
#define FOO(X) X ## Y
a:FOO()
[Preprocessor] Prevent expansion of y in x ## y when x is empty When x is empty, x ## is suppressed, and when y gets expanded, the fact that it follows ## is not available in the macro expansion result. The macro definition can be checked instead, the ## will be available there regardless of what x expands to. Fixes http://llvm.org/PR12767 Patch by Harald van Dijk! llvm-svn: 182699
2013-05-25 09:35:18 +08:00
// CHECK: a:Y
Add test for pasting empty formals llvm-svn: 38763
2006-07-28 13:13:36 +08:00
#define FOO2(X) Y ## X
b:FOO2()
[Preprocessor] Prevent expansion of y in x ## y when x is empty When x is empty, x ## is suppressed, and when y gets expanded, the fact that it follows ## is not available in the macro expansion result. The macro definition can be checked instead, the ## will be available there regardless of what x expands to. Fixes http://llvm.org/PR12767 Patch by Harald van Dijk! llvm-svn: 182699
2013-05-25 09:35:18 +08:00
// CHECK: b:Y
Add test for pasting empty formals llvm-svn: 38763
2006-07-28 13:13:36 +08:00
#define FOO3(X) X ## Y ## X ## Y ## X ## X
c:FOO3()
[Preprocessor] Prevent expansion of y in x ## y when x is empty When x is empty, x ## is suppressed, and when y gets expanded, the fact that it follows ## is not available in the macro expansion result. The macro definition can be checked instead, the ## will be available there regardless of what x expands to. Fixes http://llvm.org/PR12767 Patch by Harald van Dijk! llvm-svn: 182699
2013-05-25 09:35:18 +08:00
// CHECK: c:YY
Add test for pasting empty formals llvm-svn: 38763
2006-07-28 13:13:36 +08:00
[Preprocessor] Prevent expansion of y in x ## y when x is empty When x is empty, x ## is suppressed, and when y gets expanded, the fact that it follows ## is not available in the macro expansion result. The macro definition can be checked instead, the ## will be available there regardless of what x expands to. Fixes http://llvm.org/PR12767 Patch by Harald van Dijk! llvm-svn: 182699
2013-05-25 09:35:18 +08:00
#define FOO4(X, Y) X ## Y
d:FOO4(,FOO4(,))
// CHECK: d:FOO4