[cfe-dev] fatal error while reparsing translation unit: file '/some/path/to/header' has been modified since the precompiled header '/tmp/preamble-8ae0ef.pch' was built

[Manuel Klimek]

+argyrios

On Mon, Jun 16, 2014 at 2:07 PM, Dan Schmidt <dcschmid at gmail.com> wrote:

> Hello clang devs,
>
> I use YouCompleteMe as a semantic completion engine for vim, which in turn
> uses libclang to provide completions. By default, YCM uses the 3.4 version
> of libclang, and all works well. However, I recently updated it to use the
> head version and now I'm seeing errors like that listed in the subject.
> I've been able to create a minimal reproduction - see the attached files.
>
> To execute run commands similar to the following:
>
>    - tar xvf clang_parse.tar.gz
>    - cd clang_parse
>    - mkdir obj
>    - cd obj
>    - cmake -D CMAKE_BUILD_TYPE=Release -G "Unix Makefiles" -D
>    PATH_TO_LLVM_ROOT=<path to llvm head install dir - should have include and
>    lib under here> ../src/
>    - make
>    - ./parse_tu
>
> The basic test case is this:
>
>    - Write the small cpp and h files to disk.
>    - Parse the translation unit - observe that the syntax error is
>    reported
>    - Immediately reparse the TU.
>    - Update the header in memory and reparse - observe that the syntax
>    error is gone.
>    - Save the header to disk and reparse. Observe the "file
>    '/tmp/header_file.h' has been modified since the precompiled header
>    '/some/path/preamble-eb3c0c.pch' was built" error.
>
> Am I using these methods incorrectly, or is there a bug in clang? If I'm
> using them incorrectly, what is the correct way to reparse a translation
> unit that has changed?
>
> Thanks,
> Dan
>
>
>
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>
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