C/C++ IDE support for HotSpot

Robbin Ehn robbin.ehn at oracle.com
Fri Mar 24 07:58:48 UTC 2017

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.

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

Thanks for doing this!


> 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

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