Failed to manually build blinky example

[mraposo1]

Had tried to build it from the IDE before.  Couldn't do it.
Tried to build manually, got exactly the same error I was getting in the IDE.

Parsing C:/Users/mario.raposo/zephyrproject/zephyr/Kconfig
Loaded configuration 'C:/Users/mario.raposo/zephyrproject/zephyr/build/zephyr/.config'
No change to configuration in 'C:/Users/mario.raposo/zephyrproject/zephyr/build/zephyr/.config'
No change to Kconfig header in 'C:/Users/mario.raposo/zephyrproject/zephyr/build/zephyr/include/generated/autoconf.h'
CMake Error at ../../../cmake/extensions.cmake:1557 (message):
Assertion failed: The toolchain is unable to build a dummy C file. See
CMakeError.log.
Call Stack (most recent call first):
../../../CMakeLists.txt:42 (assert)

-- Configuring incomplete, errors occurred!
See also "C:/Users/mario.raposo/zephyrproject/zephyr/build/CMakeFiles/CMakeOutput.log".
See also "C:/Users/mario.raposo/zephyrproject/zephyr/build/CMakeFiles/CMakeError.log".

[mraposo1]

I was able to get a little bit forward.
Now getting a "undefined reference to _exit" error.
I opened a new case:

devzone.nordicsemi.com/.../undefined-reference-to-_exit-when-building-blinky

[JONATHAN LL]

You can get the latest release of the GNU Arm Embedded Toolchain here and older release here. 
check out this video for a visualization of the IDE use and more: https://youtu.be/1jgImp7FBy8?t=877 
What is the command you use in terminal when trying to build?

Do you use  west build -b thingy91_nrf9160ns ? 

And do you still get the same terminal output:

-- Cache files will be written to: C:/Nordic/ncs/zephyr/.cache
-- Found dtc: C:/ProgramData/chocolatey/bin/dtc.exe (found suitable version "1.4.7", minimum required is "1.4.6")
-- Found toolchain: gnuarmemb (C:\gnuarmemb)
-- Found BOARD.dts: C:/Nordic/ncs/nrf/boards/arm/thingy91_nrf9160/thingy91_nrf9160ns.dts
-- Generated zephyr.dts: C:/Nordic/ncs/zephyr/build/zephyr/zephyr.dts
-- Generated devicetree_unfixed.h: C:/Nordic/ncs/zephyr/build/zephyr/include/generated/devicetree_unfixed.h
Parsing C:/Nordic/ncs/zephyr/Kconfig
Loaded configuration 'C:/Nordic/ncs/nrf/boards/arm/thingy91_nrf9160/thingy91_nrf9160ns_defconfig'
Merged configuration 'C:/Nordic/ncs/zephyr/samples/basic/blinky/prj.conf'
Configuration saved to 'C:/Nordic/ncs/zephyr/build/zephyr/.config'
Kconfig header saved to 'C:/Nordic/ncs/zephyr/build/zephyr/include/generated/autoconf.h'
-- The C compiler identification is GNU 8.3.1
-- The CXX compiler identification is GNU 8.3.1
-- The ASM compiler identification is GNU
-- Found assembler: C:/gnuarmemb/bin/arm-none-eabi-gcc.exe
CMake Error at ../../../cmake/extensions.cmake:1557 (message):
Assertion failed: The toolchain is unable to build a dummy C file. See
CMakeError.log.
Call Stack (most recent call first):
../../../CMakeLists.txt:42 (assert)


-- Configuring incomplete, errors occurred!
See also "C:/Nordic/ncs/zephyr/build/CMakeFiles/CMakeOutput.log".
See also "C:/Nordic/ncs/zephyr/build/CMakeFiles/CMakeError.log".
FATAL ERROR: command exited with status 1: 'C:\Program Files\CMake\bin\cmake.EXE' '-DWEST_PYTHON=c:\users\mario.raposo\appdata\local\programs\python\python37\python.exe' '-BC:\Nordic\ncs\zephyr\build' '-SC:\Nordic\ncs\zephyr\samples\basic\blinky' -GNinja

Your CMakeOutput file look good the CMakeError has a build command fail that C executable Linking. 
resulting in a can not fin path. 

Linking C executable cmTC_3e03c
FAILED: cmTC_3e03c
:
:
The system cannot find the path specified.



We can continue the discussion on either case if the problem is related, i will get back to you on the topic of each case if there the problems are not related.
Regards,
Jonathan