hanchenye-llvm-project/clang/test/Preprocessor/macro_paste_hashhash.c

// RUN: %clang_cc1 -E %s | grep '^"x ## y";$'
#define hash_hash # ## # 
#define mkstr(a) # a 
#define in_between(a) mkstr(a) 
#define join(c, d) in_between(c hash_hash d) 
join(x, y);
Update tests to use %clang_cc1 instead of 'clang-cc' or 'clang -cc1'. - This is designed to make it obvious that %clang_cc1 is a "test variable" which is substituted. It is '%clang_cc1' instead of '%clang -cc1' because it can be useful to redefine what gets run as 'clang -cc1' (for example, to set a default target). llvm-svn: 91446 2009-12-16 04:14:24 +08:00			`// RUN: %clang_cc1 -E %s \| grep '^"x ## y";$'`
new testcase llvm-svn: 38741 2006-07-19 16:01:28 +08:00			`#define hash_hash # ## #`
			`#define mkstr(a) # a`
			`#define in_between(a) mkstr(a)`
			`#define join(c, d) in_between(c hash_hash d)`
			`join(x, y);`