[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

[Ben Langmuir]

Hey Dan,

Should be fixed in r211504.  I’ll try to get your test case added to the regression tests when I have some time.

Thanks for the detailed report,

Ben

> On Jun 20, 2014, at 5:55 PM, Ben Langmuir <blangmuir at apple.com> wrote:
> 
> 
>> On Jun 20, 2014, at 4:39 PM, Dan Schmidt <dcschmid at gmail.com> wrote:
>> 
>> FYI, I've determined that the issue was introduced in r206309. I haven't looked into it any further than that at this point, but thought I'd give an update in case anyone else was able to look into it.
> 
> Thanks for bisecting!  This is probably something to do with the changes I made to how FileManagers are shared among the ASTUnit bits.  I’ll take a look.
> 
> Ben
>> 
>> -ds
>> 
>> On Thu Jun 19 2014 at 7:18:12 AM, Dan Schmidt <dcschmid at gmail.com> wrote:
>> ping
>> 
>> Has anyone else seen similar errors? Is this a bug in libclang?
>> 
>> On Tue Jun 17 2014 at 10:48:04 AM, Manuel Klimek <klimek at google.com> wrote:
>> +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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