[llvm-bugs] [Bug 28535] New: Preamble is also generated for the second reparse on Windows

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=28535

            Bug ID: 28535
           Summary: Preamble is also generated for the second reparse on
                    Windows
           Product: clang
           Version: 3.8
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          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
    Classification: Unclassified

Created attachment 16736
  --> https://llvm.org/bugs/attachment.cgi?id=16736&action=edit
sources (libclangclient.cpp) and test input to reproduce the problem

Compile the attached libclangclient.cpp in debug mode.

Then run the executable:

> set LIBCLANG_TIMING=1
> libclangclient.exe /path/to/main.cpp
file path: D:\work\libclang38winMultiplePreambleGenerations\testsource\main.cpp
Parsing D:\work\libclang38winMultiplePreambleGenerations\testsource\main.cpp:  
     -----
Precompiling preamble:   0.0156 (100.0%)   0.0156 (100.0%)   0.0156 (100.0%)
Reparsing D:\work\libclang38winMultiplePreambleGenerations\testsource\main.cpp:
  0.0156 (100.0%)   0.0156 (100.0%)
   0.0156 (100.0%)
Precompiling preamble:        -----
Reparsing D:\work\libclang38winMultiplePreambleGenerations\testsource\main.cpp:
  0.0156 (100.0%)

Note that the preamble is not only generated for the first reparse, but also
for the second.

This does not happen on Linux, there it's only generated for the very first
reparse.

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