我正在尝试为我的EV3构建ev3dev C ++绑定（请参阅https://github.com/ddemidov/ev3dev-lang-cpp）。但是CMake没有使用我的交叉编译工具链。我已经成功安装了代码源工具链，构建了一个简单的hello world应用程序，并在我的砖上运行它。这很好用。问题是CMake使用我的主机的g ++编译器而不是工具链。我熟悉linux和交叉编译器，但我是一个完整的CMake noob。所以我怀疑CMake是我出错的地方。
我在CMakeLists.txt中添加了以下几行：
set(CMAKE_C_COMPILER "/cygdrive/c/Users/me/MentorGraphics/Sourcery_CodeBench_Lite_for_ARM_GNU_Linux/bin/arm-none-linux-gnueabi-gcc.exe")
set(CMAKE_CXX_COMPILER "/cygdrive/c/Users/me/MentorGraphics/Sourcery_CodeBench_Lite_for_ARM_GNU_Linux/bin/arm-none-linux-gnueabi-g++.exe")
这是主机gcc编译器：
$ gcc --version
gcc (GCC) 5.4.0
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
目标工具链gcc编译器：
$ /cygdrive/c/Users/me/MentorGraphics/Sourcery_CodeBench_Lite_for_ARM_GNU_Linux/bin/arm-none-linux-gnueabi-gcc.exe --version
arm-none-linux-gnueabi-gcc.exe (Sourcery CodeBench Lite 2014.05-29) 4.8.3 20140320 (prerelease)
Copyright (C) 2013 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
编译器是不同的版本，因此它们很容易区分。
现在这里是cmake构建的终端会话：
$ mkdir build
$ cd build
$ cmake ../ -DEV3DEV_PLATFORM=EV3
-- No build type selected, default to RelWithDebInfo
-- The C compiler identification is GNU 5.4.0
-- The CXX compiler identification is GNU 5.4.0
CMake Warning at /usr/share/cmake-3.6.2/Modules/Platform/CYGWIN.cmake:15 (message):
CMake no longer defines WIN32 on Cygwin!
(1) If you are just trying to build this project, ignore this warning or
quiet it by setting CMAKE_LEGACY_CYGWIN_WIN32=0 in your environment or in
the CMake cache. If later configuration or build errors occur then this
project may have been written under the assumption that Cygwin is WIN32.
In that case, set CMAKE_LEGACY_CYGWIN_WIN32=1 instead.
(2) If you are developing this project, add the line
set(CMAKE_LEGACY_CYGWIN_WIN32 0) # Remove when CMake >= 2.8.4 is required
at the top of your top-level CMakeLists.txt file or set the minimum
required version of CMake to 2.8.4 or higher. Then teach your project to
build on Cygwin without WIN32.
Call Stack (most recent call first):
/usr/share/cmake-3.6.2/Modules/CMakeSystemSpecificInformation.cmake:36 (include)
CMakeLists.txt:7 (project)
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++.exe
-- Check for working CXX compiler: /usr/bin/c++.exe -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Configuring done
-- Generating done
-- Build files have been written to: /cygdrive/c/Users/me/Documents/AppProjects/ev3dev-lang-cpp/build
$
CMake显然正在使用cygwin主机gcc / g ++编译器，尽管我试图将其配置为使用工具链。我哪里错了？
编辑：这不是cmake: problems specifying the compiler (2)的重复。我确实使用了谷歌，并且CMake wiki（https://cmake.org/Wiki/CMake_Cross_Compiling）上的交叉编译指令明确规定使用SET（）。问题原来是CMake要求在PROJECT（）之前设置编译器。我只是将SET（）行移到了PROJECT（）之上，然后CMake找到了编译器。