Eclipse Cdt Cmake

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Eclipse CDT actively works with your CMakeLists.txt file to build your project. You can add or remove source files and make other changes in your CMakeLists.txt, and the cmake4eclipse plugin applies those changes to the Eclipse CDT project at every build. You will have a nice IDE experience while keeping your CMake project current.

  1. This Eclipse plugin automatically generates build-scripts for the Eclipse CDT managed build system from CMake scripts and runs the build. Automatic generation of build scripts. No need to manually invoke cmake.
  2. This Eclipse plug-in automatically generates build-scripts for the Eclipse CDT managed build system from CMake scripts. Its Primary claim is: Co-workers should be able to just check out the source and build the project. Automatic generation of build scripts.
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Eclipse Cdt Cmake
Unresolved inclusion <iostream> when using cmake.[message #1831261]Sat, 15 August 2020 21:05
not yourconcern
Messages: 7
Registered: August 2020
Hello there, running 2020-09 build on windows and when i create the project without cmake everything works fine. However when i use cmake i get the error 'Unresolved inclusion <iostream> '. Weirdly enough program still compiles without a problem i saw alot of solutions from 2012-2015 yet none helps in this version. Any ideas?
Re: Unresolved inclusion <iostream> when using cmake.[message #1831281 is a reply to message #1831261]Sun, 16 August 2020 11:32
David Vavra
Messages: 1274
Registered: October 2012
The indexer isn't being told where <iostream> can be found.
It needs the content of the compiler builtin include path list.
Read the help file for more info:
https://help.eclipse.org/2020-06/index.jsp?topic=%2Forg.eclipse.cdt.doc.user%2Freference%2Fcdt_u_prop_general_scanner_discovery.htm&cp%3D10_4_7_0_4_6
The latest stable release of Eclipse is 2020-06.
Perhaps you've uncovered a bug in 2020-09.
Quote:
i saw a lot of solutions from 2012-2015 yet none helps in this version

There really isn't much change in the way the Indexer works between versions.
What have you tried?
Re: Unresolved inclusion <iostream> when using cmake.[message #1831284 is a reply to message #1831281]Sun, 16 August 2020 14:26
not yourconcern
Messages: 7
Registered: August 2020
David Vavra wrote on Sun, 16 August 2020 11:32

There really isn't much change in the way the Indexer works between versions.
What have you tried?

Alot of people pointed a thing called 'Preprocessor Include Paths' at Project --> Properties --> C/C++ General. Which no longer exists in the 2020 versions. Seems 2019 had it.
Somebody did this and apparently it worked on their pc (my pc is not natively english either)
Quote:
I expected this kind of bug. The Eclipse internal scanner expects the gcc output to be in english.
To fix this, force the compiler to use english output when building:
Under 'Window -> Preferences -> C/C++ -> Build -> Environment', add two new environment variables 'LANG' and 'LC_ALL' and set them both to 'en_US'.

Also this
Quote:
- Open Project Properties->C/C++ Build->Environment
- click Select.. and choose LANG
- use empty value for LANG
- repeat above step for LANGUAGE
- repeat above step for LC_ALL but use the value en_GB.UTF-8
Rebuild project and index

Sadly no luck there either.
Quote:
Hello,
please note the ? beside the include <iostream>
The compiler finds the header, but Eclipse not.
You could help Eclipse and set the path to the header files under:
Project -> Properties -> C/C++ Build -> Settings -> Compiler -> Includes

Compiler settings no longer at that place.
even this (https://help.eclipse.org/2020-03/index.jsp?topic=%2Forg.eclipse.cdt.doc.user%2Ftasks%2Fcdt_t_proj_paths.htm) is outdated.
Also someone told me to disallow heuristic resolution of includes. That didn't worked either.
Re: Unresolved inclusion <iostream> when using cmake.[message #1831296 is a reply to message #1831284]Mon, 17 August 2020 04:07
David Vavra
Messages: 1274
Registered: October 2012
Project --> Properties --> C/C++ General --> Preprocessor Include Paths, Macros etc.
is the consolidated dialog for CDT Discovery.
At least it was until recently.
For whatever reason, a new CMake project doesn't provide it.
Yet somehow the Indexer eventually finds the builtins.
I have no idea how one is supposed to add external libraries.
The compiler settings in
Project -> Properties -> C/C++ Build -> Settings -> Tool Settings tab --> <Compiler> -> Includes
are to allow CDT to generate makefiles.
However, that is CMake's job in a CMake Project so the dialog is omitted.
There are too many configurations to try.
What I do with a CMake project is

  • run CMake externally to create the Makefile
  • then import the project as an existing Makefile project.
When needed, I update the CMake configuration and re-run CMake.
I do the same with Autotools (although I use the Autotools editors to edit the configuration files).
If you don't have some compelling reason to use CMake, I recommend using a C++ Managed Build Project instead.
I notice that it contains

  • a Scanner Configuration Builder
  • and Scanner Configuration Nature is one of its natures.

I really don't know what they actually do.
You could try adding the Scanner Configuration Nature to your CMake project and see if that helps.
  • Attachment:HelloNewCMake.png
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  • Attachment:HelloNewC++ManagedNatures.png
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[Updated on: Mon, 17 August 2020 04:10]

Re: Unresolved inclusion <iostream> when using cmake.[message #1831347 is a reply to message #1831296]Mon, 17 August 2020 19:57
not yourconcern
Messages: 7
Registered: August 2020
My only reason for using CMake was making it compatible on every system and every ide, so lets say i use eclipse on windows and kdevelop on linux they both should work instantly when i put them to the other system.
Adding Scanner Configuration Nature gives me the error 'Problems encountered while setting project description'.
Re: Unresolved inclusion <iostream> when using cmake.[message #1831353 is a reply to message #1831347]Mon, 17 August 2020 21:53
David Vavra
Messages: 1274
Registered: October 2012
But do you really need Eclipse to generate the initial configuration?
You can still use CMake but let CDT think it's a Makefile Project.
Re: Unresolved inclusion <iostream> when using cmake.[message #1831376 is a reply to message #1831353]Tue, 18 August 2020 14:05
not yourconcern
Messages: 7
Registered: August 2020
Pardon me but i didn't really understand that one, how do i do that exactly?
Re: Unresolved inclusion <iostream> when using cmake.[message #1831392 is a reply to message #1831376]Wed, 19 August 2020 02:45
David Vavra
Messages: 1274
Registered: October 2012
Import the project as an existing Makefile project.
Run CMake to create the Makefile.
Re: Unresolved inclusion <iostream> when using cmake.[message #1831426 is a reply to message #1831392]Wed, 19 August 2020 14:49
not yourconcern
Messages: 7
Registered: August 2020
Aah i see, what you saying is create the project as a normal 'Eclipse C++ Managed Build Project' and then when making the project on another computer cmake will work fine, correct? Or are you saying again make the project with 'Eclipse C++ Managed Build Project' but do not complie the project from eclipse itself but rather open cmake gui and compile your project like that.
Re: Unresolved inclusion <iostream> when using cmake.[message #1831446 is a reply to message #1831426]Thu, 20 August 2020 02:46
David Vavra
Messages: 1274
Registered: October 2012
No. A Managed Build creates its own makefile.
But you could use it instead of CMake.
Import the project as an existing Makefile project.
File --> Import --> C/C++ --> Existing Code as Makefile Project
The project directory has to exist somewhere but it can be an empty directory (or even a workspace project directory).
Then add the CMake files, source, etc. as necessary and run CMake to create a Makefile.
You'll have to refresh the project after running CMake or externally modifying the project.
You could have CMake do the build also.
The key is that a Makefile project won't touch the makefile.
Alternately, you could create a Managed Build but turn off the makefile generation.
Project --> Properties --> C/C++ Build --> Generate Makefiles automatically
This effectively converts a Mangaged Build project into a Makefile Project.
Don't try creating a 'new' Makefile project.
It doesn't work the way the documentation is written.
It will likely confuse you.

[Updated on: Thu, 20 August 2020 03:02]

Re: Unresolved inclusion <iostream> when using cmake.[message #1831495 is a reply to message #1831446]Thu, 20 August 2020 22:03
not yourconcern
Messages: 7
Registered: August 2020
Roger! Thank you for the detailed explanation.
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I’m not sure if this is just a shortcoming of Eclipse or not.

Eclipse Cdt Import Cmake Project

I have a large source tree and also a CMake project that uses a small fraction of the source files in that tree. When I generate for Eclipse CDT4 and import the project, the Eclipse indexer is clearly indexing files that aren’t referenced in the CMake project. Is there a way to control this with CMake? I would have expected Eclipse to only index the specific project files. There is an Eclipse workspace setting:
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Eclipse Cdt Cmake Plugin

Any help appreciated.