CODEWITHSUNDEEP
c++opencvcmakearmodroid
HMaster
HMaster

Reputation: 49

OpenCV v3.3.1 Cross compilation for ARM Fails: No CMAKE_CXX_COMPILER could be found

I followed this tutorial, Cross compilation for ARM based Linux systems, in order to build Opencv version 3.3.1 using cmake for ARM based Linux system (Ubuntu Mate running on ODROID-XU4 Mini PC). For the build process i am running Ubuntu Mate v 16.04.1 x86.

Note that i already tried to build the same version of Opencv for my Intel x86 Ubuntu based running machine by following this tutorial, Opencv Installation in Linux, and i did it successfully. However when building it for ARM using the same machine, i got the following error.

-- The CXX compiler identification is unknown
-- The C compiler identification is unknown
CMake Error at CMakeLists.txt:114 (project):
  No CMAKE_CXX_COMPILER could be found.

  Tell CMake where to find the compiler by setting either the environment
  variable "CXX" or the CMake cache entry CMAKE_CXX_COMPILER to the full path
  to the compiler, or to the compiler name if it is in the PATH.


CMake Error at CMakeLists.txt:114 (project):
  No CMAKE_C_COMPILER could be found.

  Tell CMake where to find the compiler by setting either the environment
  variable "CC" or the CMake cache entry CMAKE_C_COMPILER to the full path to
  the compiler, or to the compiler name if it is in the PATH.


-- Configuring incomplete, errors occurred!
See also "/home/jhon/Programs/opencv-3.3.1/arm/CMakeFiles/CMakeOutput.log".
See also "/home/jhon/Programs/opencv-3.3.1/arm/CMakeFiles/CMakeError.log".

Here is my command line that generates this error:

cmake -DCMAKE_TOOLCHAIN_FILE=../platforms/linux/arm-gnueabi.toolchain.cmake ..

Please note that the option -DCMAKE_TOOLCHAIN_FILE is what tells the cmake to build Opencv for the ARM based Linux systems and when i tried to remove it, i successfully ended up with building Opencv for my x86 machine without any errors.

Thanks in advance.

Upvotes: 1

Views: 1523

Answers (2)

HMaster
HMaster

Reputation: 49

I were always wondering why there is no pre-built binaries for Opencv-Linux (and i still don't know why) so here i put my work for public to benefit from it where it includes Opencv 3.3.1 pre-built versions for Linux x86, x64 and armv7hf (including corresponding java binaries).

OpenCV Linux x86, x62 & armv7hf binaries

Upvotes: 0

Tsyvarev
Tsyvarev

Reputation: 66089

OpenCV documentation tells to install only C cross-compiler (package gcc-arm-linux-gnueabi), but actually OpenCV requires C++ compiler too.

So one need to install g++-arm-linux-gnueabi package as well.

Upvotes: 1

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