Cmake build failed with CMAKE_AR-NOTFOUND (cr exe not found)

Question

cmake build failed with

CMAKE_AR-NOTFOUND cr libperfutils.a

When i checked build folder ar is not set. x86_64-linux\gtest-native\1.7.0-r5\build\CMakeCache.txt

CMAKE_AR:FILEPATH=CMAKE_AR-NOTFOUND

//CXX compiler.
CMAKE_CXX_COMPILER:FILEPATH=/usr/bin/g++

How to set ar in cmake ?

Wheni see the cmake config below output . cmake automatically finding the g++ & why it not detecting ar

-- The CXX compiler identification is GNU 4.8.4
-- Check for working CXX compiler: g++
-- Check for working CXX compiler: g++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done

When i check ar in machine manually its available.

/usr/bin/ar

Answer 1

CMake should have been able to detect /usr/bin/ar by itself, but you can manually override this, with the -D CMAKE_AR=/usr/bin/ar option.

Here's the list of useful variables:

https://gitlab.kitware.com/cmake/community/wikis/doc/cmake/Useful-Variables