[LLVMbugs] [Bug 16799] New: Macro expansion backtrace fails to mention a parameterless macro aliasing other macro's name

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=16799

            Bug ID: 16799
           Summary: Macro expansion backtrace fails to mention a
                    parameterless macro aliasing other macro's name
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: griwes at griwes.info
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 10988
  --> http://llvm.org/bugs/attachment.cgi?id=10988&action=edit
basic testcase

For the attached file, I get the following compiler output:

main.cpp:6:9: error: use of undeclared identifier 'baz'
    foo(baz);
        ^
main.cpp:2:16: note: expanded from macro 'bar'
#define bar(a) a
               ^
1 error generated.


What I would actually expect would be something like this:

main.cpp:6:9: error: use of undeclared identifier 'baz'
    foo(baz);
        ^
main.cpp:1:13: note: expanded from macro 'foo'
#define foo bar
            ^

main.cpp:2:16: note: expanded from macro 'bar'
#define bar(a) a
               ^
1 error generated.


The first note might need to look a bit differently, but not mentioning `foo`
in this expansion backtrack looks like a bug to me.

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