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

[Dvir Yitzchaki]

What about CMAKE_INCLUDE_CURRENT_DIR<https://cmake.org/cmake/help/latest/variable/CMAKE_INCLUDE_CURRENT_DIR.html>?

Regards,

Dvir
From: CMake [mailto:cmake-bounces at cmake.org] On Behalf Of Steve Lorimer
Sent: Monday, October 17, 2016 5:04 AM
To: Craig Scott <craig.scott at crascit.com>
Cc: CMake Mailing List <cmake at cmake.org>
Subject: Re: [CMake] How to configure CMake to add current path to include directive.

Thanks Craig

Looks like it did what you intended, but cmake won't allow it

CMake Error in foo/CMakeLists.txt:
  Found relative path while evaluating include directories of "foo":

    "."

Bummer! :(



On 16 October 2016 at 18:35, Craig Scott <craig.scott at crascit.com<mailto:craig.scott at crascit.com>> wrote:
Something like the following was what I had in mind (untested):

get_target_property(incDirs someTarget INCLUDE_DIRECTORIES)
list(APPEND incDirs .)
set_target_properties(someTarget PROPERTIES INCLUDE_DIRECTORIES "${incDirs}")


On Mon, Oct 17, 2016 at 10:31 AM, Steve Lorimer <steve.lorimer at gmail.com<mailto:steve.lorimer at gmail.com>> wrote:
Thanks Craig

Not sure if I'm doing it right, but I couldn't get that to work.

Would you be able to give me an example please?

Thanks
Steve



On 16 October 2016 at 17:51, Craig Scott <craig.scott at crascit.com<mailto:craig.scott at crascit.com>> wrote:
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<mailto: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




--
Craig Scott
Melbourne, Australia
https://crascit.com

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