[llvm-bugs] [Bug 34547] New: Reparse with #ifdef leads to error "unterminated conditional directive"

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=34547

            Bug ID: 34547
           Summary: Reparse with #ifdef leads to error "unterminated
                    conditional directive"
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: libclang
          Assignee: unassignedclangbugs at nondot.org
          Reporter: nikolai.kosjar at qt.io
                CC: klimek at google.com, llvm-bugs at lists.llvm.org

This happens for 5.0 and trunk.

 % cat $FILE
 #ifdef FOO
 void f();
 #endif
 %

Parsing this file results in no diagnostics, as expected:
 % ./c-index-test -test-load-source none $FILE                                
 %

When reparsing, wrong diagnostics are emitted:
 % CINDEXTEST_EDITING=1 ./c-index-test -test-load-source none $FILE          
 /home/nik/work/preambleBug/ifdef.cpp:1:2: error: unterminated conditional
directive
 Number FIX-ITs = 0
 /home/nik/work/preambleBug/ifdef.cpp:3:2: error: #endif without #if
 Number FIX-ITs = 0
 %

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