[LLVMbugs] [Bug 9926] New: libclang PCH creation depends on headers in the clang/2.9/include subdirectory

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=9926

           Summary: libclang PCH creation depends on headers in the
                    clang/2.9/include subdirectory
           Product: clang
           Version: 2.9
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: pvaucher at infomaniak.ch
                CC: llvmbugs at cs.uiuc.edu


Hello,

It seems that libclang *needs* to find headers in the clang/2.9/include
subdirectory for it to create the automagic PCH cache. If it doens't find those
headers, the cache isn't created and code completion is "slow" everytime (not
only the first time)

We ran some tests with the following code: https://gist.github.com/758615
Here are the results: http://ideone.com/xRXdw

At http://unitedsoft.ch/trace.7z you have a trace of with & without the
headers, we see that it touches & read those headers.

>From a quick digging in the source I couldn't really find what was going on, my
wild guess is that it reads those headers to check wether they're the clang
ones and when they're not it falls back in "safe" mode or smth.

Philippe

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