[cmake-developers] Java language support regression (compared with 3.7.x and 3.8.x) for 3.9.0

[David Cole]

Alan, you had said in your original post:

"Using find and xargs -0 grep I have looked in both 3.7.2 and 3.9.0
source code for any mention of CMAKE_Java_CREATE_SHARED_MODULE, and it
just does not exist."

Try searching for "_CREATE_SHARED_MODULE" instead... it's combined in code with the name of the language.

Just a hint about how to further the investigation. I'm curious what the result will be, but don't have time right now to dig in on something peripheral to my main to do list.


David C.


> On Jul 25, 2017, at 5:07 AM, Eric Noulard <eric.noulard at gmail.com> wrote:
> 
> 
> 
> 2017-07-22 0:23 GMT+02:00 Alan W. Irwin <irwin at beluga.phys.uvic.ca>:
>> I have built CMake-3.9.0 on my Linux (Debian Jessie) platform using
>> the bootstrap method I have always successfully used for other CMake
>> versions (including 3.7.2).
>> 
>> For a complex project (PLplot) which uses swig_add_module and
>> swig_link_libraries to implement our Java binding, I get the following
>> error message at the end of that CMake-3.9.0 output.
>> 
>> -- Configuring done
>> CMake Error: Error required internal CMake variable not set, cmake may
>> not be built correctly.
>> Missing variable is:
>> CMAKE_Java_CREATE_SHARED_MODULE
>> -- Generating done
>> -- Build files have been written to:
>> /home/software/plplot/HEAD/build_dir
>> 
>> I don't get this error message for CMake-3.7.2.
>> 
>> Using find and xargs -0 grep I have looked in both 3.7.2 and 3.9.0
>> source code for any mention of CMAKE_Java_CREATE_SHARED_MODULE, and it
>> just does not exist.
>> 
>> By the way, I have tried the following simple project.
>> 
>> cmake_minimum_required(VERSION 3.6.2 FATAL_ERROR)
>> project(test_java NONE)
>> enable_language(Java)
>> message(STATUS "CMAKE_Java_CREATE_SHARED_MODULE = ${CMAKE_Java_CREATE_SHARED_MODULE}")
> 
> I'm curious with that.
> I do currently use UseJava.cmake module
> https://cmake.org/cmake/help/v3.7/module/UseJava.html
> for building some java bits in a globally C++ project.
> 
> I never tried  enable_language(Java)
> what is the status of Java support as a primary language?
> 
> I tried to find informations about that in the doc and mailing list but didn't find much.
> 
> Could someone please point me to the appropriate place concerning this?
> 
> 
> -- 
> Eric
> -- 
> 
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