[LLVMbugs] [Bug 15675] New: Empty macro arguments cause whitespace to go missing

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=15675

            Bug ID: 15675
           Summary: Empty macro arguments cause whitespace to go missing
           Product: clang
           Version: 3.2
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: harald at gigawatt.nl
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

#define A()
#define B(x)x
#define C(x) x
#define STR(x) STR_(x)
#define STR_(x) #x
STR([ A()])
STR([ B()])
STR([ C()])

is preprocessed to

"[ ]"
"[]"
"[]"

It should be "[ ]" for all three lines, which is what gcc and mcpp do.

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