[LLVMbugs] [Bug 13595] New: __builtin_va_list not defined when using -undef flag

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=13595

             Bug #: 13595
           Summary: __builtin_va_list not defined when using -undef flag
           Product: clang
           Version: 3.1
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Driver
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: jkehres at rim.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


Steps to reproduce:

1. Create a file called test.c with the following content:

   typedef __builtin_va_list foobar;

2. Compile the file using the -undef flag:

   clang -undef -c test.c

Expected result:

Clang successfully compiles the test file - just as gcc does.

Actual result:

test.c:1:9: error: unknown type name '__builtin_va_list'
typedef __builtin_va_list foobar;
        ^
1 error generated.

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