You do like everyone else does. You start fixing errors at the TOP not at the bottom.
c:/users/thoma/appdata/local/arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/2.5.0-3-20ed2b9/bin/../lib/gcc/xtensa-lx106-elf/4.8.2/../../../../xtensa-lx106-elf/bin/ld.exe: C:\Users\thoma\AppData\Local\Temp\arduino_build_115275/bsec_iot_example.ino.elf section .text' will not fit in region iram1_0_seg'
Your code compiles to use more of some kind of memory than your board has.