[llvm-bugs] [Bug 38094] New: Wrong macro redefinition report when using precompiled headers

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=38094

            Bug ID: 38094
           Summary: Wrong macro redefinition report when using precompiled
                    headers
           Product: clang
           Version: 6.0
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: libclang
          Assignee: unassignedclangbugs at nondot.org
          Reporter: contact at micbou.com
                CC: klimek at google.com, llvm-bugs at lists.llvm.org

Given the file:
```test.c
#undef TEST
#define TEST 1
```

Running the command:
```
CINDEXTEST_EDITING=1 c-index-test -test-load-source local test.c -DTEST=2
```
results in the incorrect warning:
```
// CHECK: <invalid loc>:1:9: macro definition=TEST
warning: 'TEST' macro redefined [-Wmacro-redefined]
```

There is no warning if CINDEXTEST_EDITING is not set (more precisely if the
CXTranslationUnit_PrecompiledPreamble flag is not set). This happens with Clang
6.0.1.

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