指定仅在g ++中提升到一个位置的包含路径

Question

I am working on a code base that uses the boost libraries. But, I recently ran into problems building the base on a new user's machine. I was able to boil the problem to the following. Here's how the build system looks like:

/root
    /SubModules_with_Makefiles_and_Code
    /thirdparty/boost

The submodule code will reference boost stuff like so (for example):

#include <boost/property_tree/ptree.hpp>

And the sub module make files will build such a code like so (for example):

g++ -c -o code.o code.cpp -I/root/thirdparty/boost

Our 3rd party boost library is version 1.37. However, some modules have begun using later versions of boost. This problem has been masked because the machines where these modules have been built contain boost 1.41 installed in /usr/include/boost.

The problem came to bear because the new user's machine did not have boost 1.41 installed in /usr/include. Ideally, I would like g++ to look for boost in the third party directory and nowhere else. This way, we can have tighter control of how the code base gets built.

-I<dir> places <dir> before the system includes during lookup, but system includes are still looked at and that is where later versions of boost can be installed depending on the machine. I can suppress looking at the system includes, but that would be a real pain.

Is there anyway smart way to go about this, other than replacing:

#include <boost/something.hpp>

to

#include <thirdparty/boost/something.hpp>

? If it helps, I am using gnu make 3.81 and g++ 4.4.5 on redhat linux.

Answer 1

Look at the 'include path' command line option (-I). You can set where it searches for included files. Documentation here

Answer 2

You might want to take a look at section 2.3 of the gcc manual: http://gcc.gnu.org/onlinedocs/cpp/Search-Path.html

The compiler switch you are looking for would most probably be

-nostdinc

But better take a look yourself.

EDIT: oop, I just saw you DONT want to disable the default search path - in that case just use the -I switch:

You can add to this list with the -Idir command line option. All the directories named by -I are searched, in left-to-right order, before the default directories.