IoT SDK compilation problems on Windows

Question

I have NRF 51 DK. 
 I adjusted the toolchain path to arm-gcc 4.9 2015q1. This version works fine for the NRF 51 SDK. 
 I get this error:
 lto1.exe: fatal error: bytecode stream generated with LTO version 2.1 instead of the expected 3.0 
 Do I need another version of the toolchain? I read in this question that "The libraries in the IoT SDK are compiled with version 4.7 2013q1 of the arm toolchain". Does this mean I have to use this toolchain for developing IoT apps, and should I also use this for the standard SDK?
Thanks!

Stian Røed Hafskjold · Accepted Answer

The libraries included in the IoT SDK were compiled using an LTO version used in an earlier version of the arm gcc toolchain. So, from what I am able to figure out, it is not possible to compile the SDK using version 4.9 2015q1 (Maybe someone knows any work around on this) 
 If you have a look in the release notes in the SDK, the toolchain used for testing is this: 
 - GCC: gcc-arm-embedded 4.7 2013q1
 
 You can download this version of the toolchain here: launchpad.net/.../4.7-2013-q1-update 
 Unzip the file to /install_dir/ using 
 tar xjf gcc-arm-none-eabi-*.bz2
 
 In Makefile.posix under /components/toolchain/gcc in the SDK, change the content to: 
 GNU_INSTALL_ROOT := /install_dir/gcc-arm-none-eabi-4_7-2013q1
GNU_VERSION := 4.7.3
GNU_PREFIX := arm-none-eabi
 
 You should not get the error anymore now. For the other nordic SDK's you should be fine using the newest toolchain. 
 The issue has been reported.

IoT SDK compilation problems on Windows

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