[CMake] How to configure CMake to add current path to include directive.

[Craig Scott]

I think if you manipulate the target property INCLUDE_DIRECTORIES
<https://cmake.org/cmake/help/latest/prop_tgt/INCLUDE_DIRECTORIES.html>
directly, you should be able to force a "." in there without having it
substituted for an absolute path. By this I mean use set_property() or
set_target_properties() rather than target_include_directories() or
include_directories(). Note, however, that the documentation for the
INCLUDE_DIRECTORIES property explicitly recommends against adding relative
paths to the property like this (but in your case it sounds like you really
want a relative path, so maybe this is a valid exception to that advice).



On Mon, Oct 17, 2016 at 9:46 AM, Steve Lorimer <steve.lorimer at gmail.com>
wrote:

> In makefile parlance, I'm trying to add -I. (ie: the current directory) to
> my include paths
>
> I tried the following:
>
> include_directories(".")
>
>
> This doesn't work unfortunately, as relative paths are interpreted as
> relative to the current source directory
> <https://cmake.org/cmake/help/v3.0/command/include_directories.html>
>
> That is, if this statement is in my top level CMakeLists.txt, located in
> ~/src/project, the include directive added will be "-I ~/src/project/.",
> whereas I'm trying to add "-I ."
>
> The reason for my wanting this is that we have sources for a single
> library in several subdirs.
>
> include_directories(${CMAKE_CURRENT_SOURCE_DIR})
>
> add_library(
> foo
> STATIC
> foo.cpp
> bar/bar.cpp
> )
>
> In bar/bar.cpp, I have a relative include
>
> #include "../foo.h"
>
> With the above setup, this will fail to compile as only ~/src/project/foo
> will be added to the include paths.
>
> I'm aware that if I explicitly added the path it would work
>
> include_directories(${CMAKE_CURRENT_SOURCE_DIR}/bar)
>
> However, if there is a way to get -I. added to my include path, that's
> what I'm after.
>
> TIA
> Steve
>
>
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-- 
Craig Scott
Melbourne, Australia
https://crascit.com
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