[llvm-bugs] [Bug 33806] New: clang: #line directives are skipped in preprocessor

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=33806

            Bug ID: 33806
           Summary: clang: #line directives are skipped in preprocessor
           Product: clang
           Version: 3.8
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: igor.liferenko at gmail.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 18796
  --> https://bugs.llvm.org/attachment.cgi?id=18796&action=edit
prog.c and prog.w

#line directives in situations like this

  #if 1==0
  ...
  #line ...
  ...
  #endif

must be honored to correctly compile output from ctangle.
Otherwise warnings, and debug line numbers are all wrong.

Steps to reproduce: take attached "prog.c" and "prog.w", compile "prog.c",
open it in debugger and go step by step.

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