Cmake 错误：CXX 编译器标识未知，C 编译器标识未知

Question

我正在尝试在 Fedora 21 上使用 ARM 处理器的交叉编译器安装 OpenCV。

然而，当我尝试使用 Cmake 3.03 进行配置时，出现错误：

*The CXX compiler identification is unknown
The C compiler identification is unknown
Check for working CXX compiler: /opt/FriendlyARM/toolschain/4.5.1/bin/arm-linux-g++
Check for working CXX compiler: /opt/FriendlyARM/toolschain/4.5.1/bin/arm-linux-g++ -- broken
CMake Error at /usr/share/cmake/Modules/CMakeTestCXXCompiler.cmake:54 (message):
  The C++ compiler "/opt/FriendlyARM/toolschain/4.5.1/bin/arm-linux-g++" is
  not able to compile a simple test program.
  It fails with the following output:
   Change Dir: /opt/opencv/relarm/CMakeFiles/CMakeTmp

  Run Build Command:"/usr/bin/gmake" "cmTryCompileExec1616328985/fast"
  /usr/bin/gmake -f CMakeFiles/cmTryCompileExec1616328985.dir/build.make
  CMakeFiles/cmTryCompileExec1616328985.dir/build
  gmake[1]: Entering directory '/opt/opencv/relarm/CMakeFiles/CMakeTmp'
  /usr/bin/cmake -E cmake_progress_report
  /opt/opencv/relarm/CMakeFiles/CMakeTmp/CMakeFiles 1
  Building CXX object
  CMakeFiles/cmTryCompileExec1616328985.dir/testCXXCompiler.cxx.o
  /opt/FriendlyARM/toolschain/4.5.1/bin/arm-linux-g++ -o
  CMakeFiles/cmTryCompileExec1616328985.dir/testCXXCompiler.cxx.o -c
  /opt/opencv/relarm/CMakeFiles/CMakeTmp/testCXXCompiler.cxx

  /opt/FriendlyARM/toolschain/4.5.1/lib/gcc/arm-none-linux-gnueabi/4.5.1/../../../../arm-none-linux-gnueabi/bin/as:
  error while loading shared libraries: libz.so.1: cannot open shared object
  file: No such file or directory
  CMakeFiles/cmTryCompileExec1616328985.dir/build.make:57: recipe for target
  'CMakeFiles/cmTryCompileExec1616328985.dir/testCXXCompiler.cxx.o' failed
  gmake[1]: Leaving directory '/opt/opencv/relarm/CMakeFiles/CMakeTmp'
  gmake[1]: ***
  [CMakeFiles/cmTryCompileExec1616328985.dir/testCXXCompiler.cxx.o] Error 1
  Makefile:118: recipe for target 'cmTryCompileExec1616328985/fast' failed
  gmake: *** [cmTryCompileExec1616328985/fast] Error 2


  CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
  CMakeLists.txt:63 (project)
Configuring incomplete, errors occurred!
See also "/opt/opencv/relarm/CMakeFiles/CMakeOutput.log".
See also "/opt/opencv/relarm/CMakeFiles/CMakeError.log".*

我尝试将路径添加到我的 bash_profile，因此它看起来像这样：

# .bash_profile

# Get the aliases and functions if [ -f ~/.bashrc ]; then
        . ~/.bashrc fi

# User specific environment and startup programs

PATH=$PATH:$HOME/bin export PATH=$PATH:/usr/local/bin:/usr/local/sbin:/opt/FriendlyARM/toolschain/4.5.1/bin/arm-linux-g++:/usr/bin/gmake:/usr/share/bin:/usr/share/sbin

我已经谷歌搜索了几个小时，但找不到任何有用的步骤。任何帮助，将不胜感激。提前致谢。

Answer 1

从输出来看，cmake 似乎能够找到您的交叉编译器，但正如输出所说，它无法编译一个简单的程序。我将从用 C++ 创建 Hello World 开始，然后尝试使用交叉编译器对其进行编译。如果那不起作用，那是您的第一个问题。如果它确实有效，那么我猜它与某些环境变量有关。您可以尝试让 cmake 在尝试编译简单的 C++ 程序之前打印环境变量并与您的 shell 环境变量进行比较，抱歉，我没有比这更有帮助的了。

更新：

所以我下载了 FriendlyArm，它提供的二进制文件是 32 位 ELF，因此您需要 32 位版本的 libz。 yum install zlib.i686 应该可以解决您的问题。 FriendlyArm 工具链适合我，我已经安装了 zlib.i686。如果您收到有关缺少共享对象的任何其他错误，请确保您安装了 32 位版本。

Cmake 错误：CXX 编译器标识未知，C 编译器标识未知

Cmake errors: The CXX Compiler identification is unknown, The C compiler identification is unknown

c++

opencv

arm

cmake

cmake-gui