Tasmota: Compile latest dev with core 2.3.0 fails with VSC (Platformio)

[Jason2866]

BUG DESCRIPTION

Compile latest dev fails with core 2.3.0

REQUESTED INFORMATION

• [x] Read the Contributing Guide and Policy and the Code of Conduct
• [x] Searched the problem in issues (https://github.com/arendst/Sonoff-Tasmota/issues)
• [x] Searched the problem in the wiki (https://github.com/arendst/Sonoff-Tasmota/wiki/Troubleshooting)
• [x] Searched the problem in the forum (https://groups.google.com/d/forum/sonoffusers)
• [x] Searched the problem in the chat (https://discord.gg/Ks2Kzd4)
• [x] Device used (i.e. Sonoff Basic) : none
• [x] Tasmota binary firmware version number used : 6.5.0.16 / (self-compiled ?)
• [x] Development IDE - Compiler / Upload tools used : VSC / ____
• [x] Provide the output of command status 0 :

Not possible compile error

TO REPRODUCE

USE VSC and compile dev with core 2.3.0 enabled

EXPECTED BEHAVIOUR

Compile without error

SCREENSHOTS

Linking .pioenvs/sonoff/firmware.elf
/home/gitpod/.platformio/packages/[email protected]/bin/../lib/gcc/xtensa-lx106-elf/4.8.2/../../../../xtensa-lx106-elf/lib/libm.a(lib_a-ef_fmod.o):(.literal+0x0): undefined reference to `__ieee754_remainderf'
/home/gitpod/.platformio/packages/[email protected]/bin/../lib/gcc/xtensa-lx106-elf/4.8.2/../../../../xtensa-lx106-elf/lib/libm.a(lib_a-ef_fmod.o): In function `__ieee754_fmodf':
ef_fmod.c:(.text+0x36): undefined reference to `__ieee754_remainderf'
collect2: error: ld returned 1 exit status
*** [.pioenvs/sonoff/firmware.elf] Error 1
===================================== [ERROR] Took 85.55 seconds =====================================

============================================= [SUMMARY] =============================================
Environment sonoff              [ERROR]

[snakuzzo]

Just a little info.
Yesterday I tried to build firmware on macOS Mojave + Atom (platformio) ... same error.
Today I tried using Windows x64 + VS Code (platformio) and it worked

[Jason2866]

Found the problem. Core 2.3.0 uses Xtensa build chain 1.408x
In this build chain the file c:\Users\account\.platformio\packages\toolchain-xtensa\xtensa-lx106-elf\lib\libm.a has not included the needed referenced function.
Replacing this file with file from Xtensa build chain 2.4x does solve the error.

[arendst]

Agh.

To solve this for arduino too we have to find the source for function fmodf as used in sonoff_float.ino and add it to this file.

[Jason2866]

Maybe this https://github.com/jcmvbkbc/newlib-xtensa/blob/xtensa/newlib/libm/math/ef_fmod.c

[arendst]

Won't work either as remainderf also is not in core 2.3.0 lib.

I have another solution and will release soon.

[Jason2866]

Seems to work :-)

[snakuzzo]

It works!
Thanks ;)