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

[Bertjan Broeksema]

Bertjan Broeksema wrote:

> 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);
> 

Replying to myself, this latter doesn't explain the problem, as it does work 
with clang++. The first results in a lot of "ignoring nonexistent directory" 
messages so I'm at least a step closer, but there must be something else I'm 
overlooking. Maybe more languageOptions must be enabled?

Cheers,

Bertjan