Review Request 119999: Do not update caches of system headers when the environment changed.

[Milian Wolff]

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https://git.reviewboard.kde.org/r/119999/
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Review request for KDevelop, Kevin Funk, Olivier Jean de Gaalon, and Sergey Kalinichev.


Repository: kdev-clang


Description
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This greatly improves the performance when we edit two files with
different environments which each include some system includes.
Without this patch, we'd play cache ping-pong on the system includes.

NOTE: This is not yet optimal as we can still play cache ping-pong
for user headers as soon as the include paths or defines for a given
set of includers are different. But maybe this is a first step
and a good idea in general? Feedback welcome!


Diffs
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  duchain/clanghelpers.cpp 099b8ea8338afb0dd6a11a336710fe7ffbf00068 
  duchain/clangparsingenvironmentfile.h 72b7aeb962a9a8513df574d534b6ac54855bf1f6 
  duchain/clangparsingenvironmentfile.cpp ab0bf6712ce17a49f4e64caef29e55d98572d000 
  tests/test_duchain.cpp 66ac9f64883f02f68795bbef36a322f3de17d35f 

Diff: https://git.reviewboard.kde.org/r/119999/diff/


Testing
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tried the unit test and also manually tested the following:

    ~~~~~~~ CMakeLists.txt: ~~~~~~~~~~
    cmake_minimum_required(VERSION 2.8.11)
    project(test)
    
    add_executable(fileA fileA.cpp)
    set_property(TARGET fileA APPEND PROPERTY INCLUDE_DIRECTORIES "/tmp/foo")
    
    add_executable(fileB fileB.cpp)
    set_property(TARGET fileB APPEND PROPERTY INCLUDE_DIRECTORIES "/tmp/bar")
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

And both fileA.cpp and fileB.cpp just need to have something like this:

    ~~~~~~~~~~~~~~~~~~
    #include <iostream>
    int foo() {}
    ~~~~~~~~~~~~~~~~~~

Now run this in a kdev-clang KDevelop session and enable the corresponding 
debug area. Once both files are cached/highlighted, change one of them, wait 
for the update, then the other. With change I mean e.g. add an argument to the 
function or anything like that, but keep the iostream include.


Thanks,

Milian Wolff

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