Re: [CMake] CMAKE_CXX_COMPILE_OBJECT not set with ADD_SUBDIRECTORY

[CHEVRIER, Marc]

PROJECT instruction MUST BE the first one after CMAKE_MINIMUM_REQUIRED:
-- lib
   CMakeLists.txt
   {
   CMAKE_MINIMUM_REQUIRED (VERSION 2.8.8)
   PROJECT(lib)
   ADD_SUBDIRECTORY(libtest)
   }


From: CMake on behalf of Emmanuel HOUITTE
Date: Friday 11 September 2015 15:26
To: "cmake@cmake.org<mailto:cmake@cmake.org>"
Subject: [CMake] CMAKE_CXX_COMPILE_OBJECT not set with ADD_SUBDIRECTORY

I’m working with cmake version 2.8.12.2 on CentOS6.
I’ve got a very simple project with one subdirectory.
Each directory has a CMakeLists.txt file.
The ADD_SUBDIRECTORY seems to remove the default generated CMAKE rule variables 
in the generation step.
Is it normal? How to get an example without generation errors?
If I replace the ADD_SUBDIRECTORY by the code of the second CMakeLists.txt, 
there is no problem.

This is the content of my project:

-- lib
   CMakeLists.txt
   {
   CMAKE_MINIMUM_REQUIRED (VERSION 2.8.8)
   ADD_SUBDIRECTORY(libtest)
   PROJECT(lib)
   }
   -- libtest
      CMakeLists.txt
      {
      FILE(WRITE "empty.cpp" "")
      ADD_LIBRARY(test STATIC empty.cpp )
      }

And the results:

$ cmake -DCMAKE_BUILD_TYPE=Release
-- Configuring done
CMake Error: Error required internal CMake variable not set, cmake may be not 
be built correctly.
Missing variable is:
CMAKE_CXX_COMPILE_OBJECT
CMake Error: Error required internal CMake variable not set, cmake may be not 
be built correctly.
Missing variable is:
CMAKE_CXX_CREATE_STATIC_LIBRARY
-- Generating done
-- Build files have been written to: /home/test/lib

-- 

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