[CMake] Checking Variables in a tool-chain file

[Torsten Robitzki]

Hi,
I have a tool-chain file, which requires a variable to be set to the path to the compiler on the local machine:

  set(CMAKE_C_COMPILER ${ARM_GCC_TOOL_PATH}/bin/arm-none-eabi-gcc)
  set(CMAKE_CXX_COMPILER ${ARM_GCC_TOOL_PATH}/bin/arm-none-eabi-g++)

Now I want to give the user an error message, in case that this variable is not set. The „usual“ check for the existence of the variable doesn’t work, because the tool-chain file is included in different context, without access to the cache.

Any idea?

regards,
Torsten

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