[cfe-users] Avoid all system include paths
Douglas Katzman via cfe-users
cfe-users at lists.llvm.org
Fri Nov 11 10:08:54 PST 2016
Remove '-nobuiltininc' and substitute '-nostdinc'. That's in addition to
On Fri, Nov 11, 2016 at 11:00 AM, Emilio Pombo via cfe-users <
cfe-users at lists.llvm.org> wrote:
> 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/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!
> cfe-users mailing list
> cfe-users at lists.llvm.org
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