[LLVMbugs] [Bug 8654] New: clang-as-a-library's preprocessor doesn't trigger Elif, Else and Endif callbacks at the right times

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=8654

           Summary: clang-as-a-library's preprocessor doesn't trigger
                    Elif, Else and Endif callbacks at the right times
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: richard-llvm at metafoo.co.uk
                CC: llvmbugs at cs.uiuc.edu


Created an attachment (id=5806)
 --> (http://llvm.org/bugs/attachment.cgi?id=5806)
Proposed fix

'dsturtevant' on IRC pointed out that PPCallbacks::Elif, Else and Endif aren't
called if they terminate a preprocessor block which is being skipped due to an
earlier #if or #elif not matching. For instance:

#if 0 // If()
#else // Else() MISSED
#endif // Endif()

#if 0 // If()
#elif 1 // Elif() MISSED
#else // Endif()

#if 0 // If()
#endif // Endif() MISSED

I've put together a patch which should fix this but it's untested (there don't
seem to be any tests of the PPCallbacks stuff to model such a test on).

-- 
Configure bugmail: http://llvm.org/bugs/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are on the CC list for the bug.