C/C++ IDE support for HotSpot

[Robbin Ehn]

Hi, again,

On 03/24/2017 08:58 AM, Robbin Ehn wrote:
> Hi Mikeal,
>
> On 03/22/2017 05:20 PM, Erik Österlund wrote:
>> Hi Mikael,
>>
>> In my workflow I use emacs with rtags for snytax awareness.
>> With your cmake patch, I could easily generate the cmake files and run cmake  with -DCMAKE_EXPORT_COMPILE_COMMANDS to generate the compiler_commands.json file used by rtags
>> to understand how the code fits together, and feed it to rdm. Everything worked out of the box.
>
> I also use rtags, but with vim.
>
>>
>> With these changes it was faster than ever to setup a good emacs-based project for hotspot development. So I encourage these changes!
>
> I have not tested this, but it must be faster, since now I compile the source twice, once with gcc and once with clang for rtags.

I have still gotten my morning coffee, this step I have to do anyways of course.

>
> Can cmake do incremental updates to compiler_command.json file, would be awesome if so? (Erik?)

This is what I need, now I can't do incremental builds if change any flags or add files.

/Robbin

>
> Thanks for doing this!
>
> /Robbin
>
>>
>> Thanks,
>> /Erik
>>
>> On 2017-03-22 15:21, Mikael Gerdin wrote:
>>> Hi all,
>>>
>>> I've finally grown tired of manually setting up a hand crafted Eclipse CDT configuration for the JVM sources and decided to share my progress towards improving the
>>> overall situation for JVM developers.
>>>
>>> To achieve better IDE support without having to add project generators for all different kinds of past or future IDEs I've decided to try to leverage CMake to do project
>>> generation.
>>> The idea is to have the JDK build system generate a CMakeLists.txt describing all the include paths and definitions required by an IDE to interpret the sources correctly.
>>>
>>> Several modern IDEs natively support CMake but we can also rely on the fact that the CMake build system has the ability to generate projects for a number of different
>>> IDEs. For information about which generators CMake supports see
>>> https://cmake.org/cmake/help/v3.5/manual/cmake-generators.7.html
>>> for your CMake version.
>>>
>>> To try this out check out (heh) my branch "JDK-8177329-cmake-branch" in the jdk10/sandbox forest:
>>> http://hg.openjdk.java.net/jdk10/sandbox/branches
>>> So far I've only made changes in the toplevel and hotspot repositories.
>>> I've written a short readme in the repo:
>>> http://hg.openjdk.java.net/jdk10/sandbox/raw-file/JDK-8177329-cmake-branch/README-cmake.html
>>>
>>> It would be great if people tried this out to see if it works on their setup but I don't expect it to work on Windows without changing the makefile to do path conversion.
>>> If we can make this work properly then perhaps we can get rid of the Visual Studio generator and rely on CMake to generate VS projects.
>>>
>>> It would also be great if someone from build-dev could give me some hints about how to do the file writing and "vardeps" thing properly.
>>>
>>> Thanks
>>> /Mikael
>>