ESP8266 Community Forum

Hi,

I just tried to compile a sketch using DHT.h in Arduino IDE 1.6.5 on my NodeMCU 1.0(ESP-12E) Module.
Even if I try an empty sketch all I get is this:

Build options changed, rebuilding all

c:/users/myname/appdata/roaming/arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/1.20.0-26-gb404fb9/bin/../lib/gcc/xtensa-lx106-elf/4.8.2/../../../../xtensa-lx106-elf/lib\libm.a(lib_a-w_sqrt.o):(.literal+0x8): undefined reference to `__ieee754_sqrt'

c:/users/myname/appdata/roaming/arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/1.20.0-26-gb404fb9/bin/../lib/gcc/xtensa-lx106-elf/4.8.2/../../../../xtensa-lx106-elf/lib\libm.a(lib_a-w_sqrt.o): In function `sqrt':

d:\ivan\projects\arduinoesp\toolchain\dl\esp-newlib\build\xtensa-lx106-elf\newlib\libm\math/../../../../../newlib/libm/math/w_sqrt.c:63: undefined reference to `__ieee754_sqrt'

collect2.exe: error: ld returned 1 exit status
Error compiling.

The folder D:\ivan\projects is something that does not exist on my computer.

Any ideas ?

BR
Gawan

look here: viewtopic.php?f=28&t=6043&p=32424&hilit=dht+library#p32424

Perfect, thank you !!