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编辑：接受的答案还没有解决我的问题，但它回答了我提出的问题 - 如果你能帮助我解决下面描述的实际问题，你可能会回答这个问题。

我有一个 CMake 项目，它使用需要设置变量的框架（即https://github.com/queezythegreat/arduino-cmake，需要ARDUINO_SDK_PATH）

奇怪的是，在我在命令行上设置该变量后，它首先有一个值，但看起来它在一段时间后消失了。

我在跑

cmake -DARDUINO_SDK_PATH=/path/to/sdk ..

.. 并收到一条错误消息，告诉我它没有设置。打印出我的顶部CMakeLists.txt和内部检查变量的框架的顶部的值给了我这样的东西：

>>> ARDUINO_SDK_PATH (beginning): '/home/me/project/arduino-1.8.2'
>>> ARDUINO_SDK_PATH (before check): '/home/me/project/arduino-1.8.2'
-- The C compiler identification is GNU 6.2.0
-- The CXX compiler identification is GNU 6.2.0
-- Check for working C compiler: /usr/bin/avr-gcc
>>> ARDUINO_SDK_PATH (before check): ''
CMake Error at /home/me/project/arduino-cmake/cmake/ArduinoToolchain.cmake:84 (message):
  Could not find Arduino SDK (set ARDUINO_SDK_PATH)!
Call Stack (most recent call first):
  /home/me/project/build/CMakeFiles/3.6.2/CMakeSystem.cmake:6 (include)
  /home/me/project/build/CMakeFiles/CMakeTmp/CMakeLists.txt:3 (project)

CMake Error: Internal CMake error, TryCompile configure of cmake failed
-- Configuring incomplete, errors occurred!
See also "/home/me/project/build/CMakeFiles/CMakeOutput.log".

所以它看起来好像ARDUINO_SDK_PATH以某种方式失去了它的价值。我没有找到一个实际的命令，它被分配了任何值，所以我不知道如何继续。我现在当然可以在任何地方向我的 CMake 项目添加代码以打印出值，ARDUINO_SDK_PATH但我想知道是否有内置跟踪变量值的方法。

我试过了cmake --trace ..，cmake --trace-expand ..但输出似乎没有帮助..

系统：Fedora 25 和 CMake 3.6.2

更新

感谢 Florian，我添加variable_watch(ARDUINO_SDK_PATH)了第一行CMakeLists.txt，现在我的变量跟踪行 ( message()) 如下所示：

CMake Debug Log at arduino-cmake/cmake/ArduinoToolchain.cmake:41 (MESSAGE):
  Variable "ARDUINO_SDK_PATH" was accessed using READ_ACCESS with value
  "/home/me/project/arduino-1.8.2".
Call Stack (most recent call first):
  /usr/share/cmake/Modules/CMakeDetermineSystem.cmake:98 (include)
  CMakeLists.txt:10 (project)

>>> ARDUINO_SDK_PATH (before check): /home/me/project/arduino-1.8.2

我有大约 30 条这样的消息，但是后面有几行没有值且没有跟踪消息的跟踪行。

所以看起来变量ARDUINO_SDK_PATH被一个新的替换为空的并且不再被跟踪..

复制

为了使这种行为可重现，我上传了代码：https ://github.com/frans-fuerst/trinket_led

注意：提供的CMakeLists.txt不包含有用的代码 - 它只是重现错误。

您需要下载Arduino-SDK，将其解压缩并在命令行中提供路径：

tar xvf ~/Downloads/arduino-1.8.2-linux64.tar.xz 
git clone https://github.com/frans-fuerst/trinket_led
cd trinket_led
git submodules update --init
mkdir build
cd build
cmake -DARDUINO_SDK_PATH=/path/to/arduino-1.8.2 ..

注意：有一个find_path命令ArduinoToolchain.cmake看起来很可疑。但是你可以用同样的结果删除它..

CMakeFiles/CMakeOutput.log

The target system is: Arduino -  - 
The host system is: Linux - 4.10.12-200.fc25.x86_64+debug - x86_64
Compiling the C compiler identification source file "CMakeCCompilerId.c" succeeded.
Compiler: /usr/bin/avr-gcc 
Build flags: 
Id flags: 

The output was:
0


Compilation of the C compiler identification source "CMakeCCompilerId.c" produced "a.out"

The C compiler identification is GNU, found in "/home/frans/_HOME/1704_trinket_led/build/CMakeFiles/3.6.2/CompilerIdC/a.out"

Compiling the CXX compiler identification source file "CMakeCXXCompilerId.cpp" succeeded.
Compiler: /usr/bin/avr-g++ 
Build flags: 
Id flags: 

The output was:
0


Compilation of the CXX compiler identification source "CMakeCXXCompilerId.cpp" produced "a.out"

The CXX compiler identification is GNU, found in "/home/frans/_HOME/1704_trinket_led/build/CMakeFiles/3.6.2/CompilerIdCXX/a.out"
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1 回答 1

7

只需variable_watch(ARDUINO_SDK_PATH)在您的CMakeLists.txt.

参考

于 2017-04-30T18:12:45.747 回答