[cfe-dev] Extracting the include tree from a source file

[Bertjan Broeksema]

Nico Weber wrote:

> On Mon, Nov 15, 2010 at 8:33 PM, Bertjan Broeksema
> <broeksema at kde.org> wrote:
>> Hi,
>>
>> Nico Weber wrote:
>>
>> Thanks for the quick reply!
>>
>>> Hi,
>>>
>>> Call InitializePreprocessor to add defines. To fix the crash, add
>>> calls to BeginSourceFile()/EndSourceFile() (see
>>> https://github.com/nico/clangtut/blob/master/tut03_pp.cpp ).
>>
>> Yes, I'm a step closer now, it indeed doesn't crash anymore when an error
>> occurs. However, I still have the problem that system includes are not
>> found. In this particular case stddef.h. I am somewhat assuming that it
>> shouldn't be needed to add paths like:
>>
>> /usr/include/linux (for stddef.h)
>> /usr/lib/gcc/x86_64-pc-linux-gnu/4.4.4/include
>>
>> clang++ (the command line tool), seems to have these paths available as
>> it is able to preprocess the same file I'm testing with, without
>> complaining about not finding stddef.h
> 
> All these are added in  InitHeaderSearch::AddDefaultCIncludePaths()
> and friends in lib/Frontend/InitHeaderSearch.cpp. Maybe step through
> that code for your binary and for clang and check which branches are
> taken in both cases.

Found two problems, the first was obvious: I didn't set any language enabled 
in LanguageOptions -> langOption.CPlusPlus = true; Doh!

The second, I've a recent Gentoo system and the following path is missing in 
InitHeaderSearch.cpp:

// Gentoo amd64 gcc 4.4.4
    AddGnuCPlusPlusIncludePaths(
        "/usr/lib/gcc/x86_64-pc-linux-gnu/4.4.4/include/g++-v4",
        "x86_64-pc-linux-gnu", "32", "", triple);

Cheers,

Bertjan