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Working With Eclipse CDT
Install Eclipse, and its CDT (C Development Tooling), as is recommended on your distribution. E.g., on Fedora, "dnf install eclipse-cdt" is enough. If you prefer to install from source, check out the instructions in https://www.eclipse.org/cdt/.
Eclipse uses a Java virtual machine started with a fixed upper limit on its heap size, defined in /etc/eclipse.ini. The default limit is sometimes not large enough for indexing the OSv project. It's recommended to edit /etc/eclipse.ini (as root) and make sure the "-Xmx" setting is at least 1 GB.
Download OSv from git, and run "make". It is important to run "make" once before editing, because the first time we build OSv generates some header files which are needed for Eclipse to proper parsing of the other source files.
Under File -> New -> Project, select C/C++ folder and than select "Makefile Project with Existing Code".
Click Next.
Give a project name and select the place where OSv code was downloaded.
You can now click Finish.
OSv has some particularities that eclipse do not understand as default, such as:
- It does have it's own libc/stdc++/libboost implementation
- Its' a Kernel
- It's c++11
- It has a lot of includes paths that preprocessor should be awere of.
Unfortunately there is no magic configuration file that address all of this, so some manual configuration is needed.
Project -> Properties -> C/C++ General -> Preprocessor Includes -> GNU C++ -> CDT User Setting Entries -> Add a "Preprocessor Macro"; Name: __GXX_EXPERIMENTAL_CXX0X__ value: 1
Project -> Properties -> C/C++ General -> Preprocessor Includes -> GNU C++ -> CDT User Setting Entries -> Add a “Include Directory”, in “Filesystem”, “/usr/include”
To use OSv provided libs and includes, and to work correctly with c++11, we need some more tweaks. So go to:
Project -> Properties -> C/C++ General -> Preprocessor Includes
Under Provides tab, select CDT GCC Built-in Compiler Settings and uncheck "Use global provider shared between projects". Use the following command:
${COMMAND} -E -P -v -dD "${INPUTS}" -std=c++11 -include /YOUR_PATH_TO_OSV_SOURCE/include/api/stdalign.h -nostdlib -nostdinc -nostdinc++
do not forget to replace YOUR_PATH_TO_OSV_SOURCE
This will prevent indexer to guess things in a wrong way:
Project -> Properties -> C/C++ General -> Indexer
Uncheck: "Index source files not included in the build" and "Allow heuristic resolution of includes'.
To make OSv's code formatter conform to OSv's coding style, go to Project -> Properties -> C/C++ General -> Formatter, Set "Enable project specific settings", choose the K&R formatter and then click on the "Edit..." button to edit the formatter, choose a new name (e.g., "OSV") and in the "Indentation" setting choose "spaces only" as a tab policy.