[cfe-users] Avoid all system include paths

[Emilio Pombo via cfe-users]

Hi,

I want to make clang parser to avoid all default and builtin include path
in my system (Ubuntu 14.04.5 LTS) for lib C and C++ stl (GNU, LLVM or
whatever). I'm using the two most canonical options for doing that (I
think): -*nobuiltininc* and -*nostdinc++*, also tried to change some roots
or prefixes with -isysroot , -iwithprefix or --gcc-toolchain, but still
with no luck.

A simple example of my clang unwanted behavior could be:

*$* echo '#include <aio.h>' > aio.cc
*$* clang++ -nobuiltininc -nostdinc++ -v aio.cc
clang version 3.9.1-svn281634-1~exp1 (branches/release_39)
...
ignoring nonexistent directory "/include"
#include "..." search starts here:
#include <...> search starts here:
 */usr/local/include*
* /usr/include/x86_64-linux-gnu*
* /usr/include*
End of search list.
...

So in this execution clang ends up finding the header aio.h (in
/usr/include/), while this is just the behavior I'm looking forward to
modify. Any ideas to change it?

With the clang verbose option, you can see that those paths are included
before the parser starts, using flags like: -*internal*-isystem and -
*internal*-externc-isystem, there is a way to change or turn-off those
internal settings?

Thanks in advance!

Emilio.
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