[CMake] Checking Variables in a tool-chain file

[Torsten at Robitzki.de]

Hi Sergei,

> Am 31.01.2019 um 08:42 schrieb Sergei Nikulov <sergey.nikulov at gmail.com>:
> 
> Just guessing maybe better use $ENV{ARM_GCC_TOOL_PATH} ?
> https://cmake.org/cmake/help/latest/variable/ENV.html?highlight=env

Well, but this would mean, I had to configure CMake not only with Cache variables:

cmake -DARM_GCC_TOOL_PATH=/usr/local/gcc-arm-none-eabi-7-2018-q2-update -DBINDING=nrf52 -DCMAKE_TOOLCHAIN_FILE=../cmake/gcc-arm-none-eabi.cmake -DNRF5_SDK_ROOT=~/CMSIS/nRF5_SDK_14-2/ ..

But also with environment variables:
ARM_GCC_TOOL_PATH=/usr/local/gcc-arm-none-eabi-7-2018-q2-update cmake -DBINDING=nrf52 -DCMAKE_TOOLCHAIN_FILE=../cmake/gcc-arm-none-eabi.cmake -DNRF5_SDK_ROOT=~/CMSIS/nRF5_SDK_14-2/ ..

Thanks for the pointer, I will think about it.

kind regards,
Torsten
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