Stable version libm.a compilation error

[ghost]

Compiling project using libm.a throws: 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-e_pow.o):(.literal+0xf8): undefined reference to `__ieee754_sqrt'

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-e_pow.o): In function __ieee754_pow': d:\ivan\projects\arduinoesp\toolchain\dl\esp-newlib\build\xtensa-lx106-elf\newlib\libm\math/../../../../../newlib/libm/math/e_pow.c:164: undefined reference to__ieee754_sqrt' collect2.exe: error: ld returned 1 exit status

Some hints how to deal with this? Thanks

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[krulkip]

I get same problem.

Arduino: 1.6.5 (Windows 7), Board: "Generic ESP8266 Module, Serial, 80 MHz, 40MHz, DIO, 115200, 512K (64K SPIFFS)"

j:/arduino-1.6.5-r2/portable/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-e_pow.o):(.literal+0xec): undefined reference to __ieee754_sqrt' j:/arduino-1.6.5-r2/portable/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-e_pow.o): In functionieee754_pow': d:\ivan\projects\arduinoesp\toolchain\dl\esp-newlib\build\xtensa-lx106-elf\newlib\libm\math/../../../../../newlib/libm/math/e_pow.c:164: undefined reference to `ieee754_sqrt' collect2.exe: error: ld returned 1 exit status

[forkineye]

Experiencing this as well / windows 8.1 and Arduino 1.6.5-r2 Arduino: 1.6.5 (Windows 8.1), Board: "NodeMCU 1.0 (ESP-12E Module), 80 MHz, 115200"

c:/users/xxxx/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-e_pow.o):(.literal+0x104): undefined reference to__ieee754_sqrt' c:/users/xxxx/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-e_pow.o): In function __ieee754_pow': d:\ivan\projects\arduinoesp\toolchain\dl\esp-newlib\build\xtensa-lx106-elf\newlib\libm\math/../../../../../newlib/libm/math/e_pow.c:164: undefined reference to__ieee754_sqrt'` collect2.exe: error: ld returned 1 exit status

[igrr]

I think the workaround is to delete the downloaded package (it's somewhere in the user folder on Windows) as well as downloaded toolchain archive. Arduino doesn't download the file again even though the size and checksum had changed.

I will bump toolchain version for the next release.

On Tue, Jul 28, 2015, 20:23 Shelby Merrick notifications@github.com wrote:

Experiencing this as well / windows 8.1 and Arduino 1.6.5-r2 Arduino: 1.6.5 (Windows 8.1), Board: "NodeMCU 1.0 (ESP-12E Module), 80 MHz, 115200"

c:/users/xxxx/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-e_pow.o):(.literal+0x104): undefined reference to __ieee754_sqrt' c:/users/xxxx/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-e_pow.o): In functionieee754_pow': d:\ivan\projects\arduinoesp\toolchain\dl\esp-newlib\build\xtensa-lx106-elf\newlib\libm\math/../../../../../newlib/libm/math/e_pow.c:164: undefined reference to `ieee754_sqrt'

collect2.exe: error: ld returned 1 exit status

—

Reply to this email directly or view it on GitHub https://github.com/esp8266/Arduino/issues/612#issuecomment-125684215.

[forkineye]

@igrr I just tried that out, removing the ESP8266 board from the Arduino IDE and then removing all ESP and xtensa references located in the users\<user>\appdata\arduino15 packaging and staging directories. Same issue when trying to call pow().

Example from a gamma table generation loop: Serial.print((int)(255 * pow((i / 255), gamma)));

[forkineye]

I'm able to recreate this issue, but only with floats inside of loops. Code to re-create is here - https://gist.github.com/forkineye/d05909c5c0184c7300ae. The toolchain is 1.20.0-26-gb404fb9. Toolchain archive is win32-xtensa-lx106-elf-gb404fb9.tar.gz with a MD5 hash of 7e6cf4fb104022ddee0b9ef716232439

void setup() {
    Serial.begin(115200);
    Serial.println("");

    float x = 2.0; 
    float y = 2.2;

    int i;
    for(i = 0; i < 10; i++) {
        Serial.println(pow(i, x));
        Serial.println(pow(i, y));    // Fails to compile
    }
    Serial.println(pow(i, y));        // Compiles fine, 10 ^ 2.2
}

void loop() {

}

[krulkip]

This seems to refer to a fix for this issue, but not sure how to try https://github.com/jcmvbkbc/crosstool-NG/commit/b404fb9ec3a5c59e6b4d90741d39f7d1937431cd

[igrr]

Windows toolchain is not built using crosstool-NG, so probably not exactly relevant.

On Sun, Aug 9, 2015, 00:41 krulkip notifications@github.com wrote:

This seems to refer to a fix for this issue, but not sure how to try jcmvbkbc/crosstool-NG@b404fb9 https://github.com/jcmvbkbc/crosstool-NG/commit/b404fb9ec3a5c59e6b4d90741d39f7d1937431cd

— Reply to this email directly or view it on GitHub https://github.com/esp8266/Arduino/issues/612#issuecomment-129047628.

[krulkip]

I installed this libm.a file replacing the xisting one in 1.20.0-26-gb404fb9/xtensa-lx106-elf/lib/ and the error was solved. https://files.gitter.im/esp8266/Arduino/Abqa/libm.a.tbz

[Testato]

same problem here, i use the Stable version on Win7-64

Is it solved on Staging Version ?

[locchi93]

same problem on windows using the current Stable version and Arduino ide 1.6.5

[Testato]

@krulkip Thanks, whit your lib there is no problem

[erhome00]

Testato or igrr,

can you please tell me how exactly I use that corrected LIB? I have the same problem and am not able to solve it...

[tim-in-oakton]

Doh!! I was multiplexing and missed the note from krulkip - copied his older libm.a over, now compiles -

we must have a bug in the package..... but this is a workaround!

Same issue here, trying to port over a module that uses math - at compile I get:

c:/users/timm/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+0x4): undefined reference to __ieee754_sqrt' c:/users/timm/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 functionsqrt': 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' c:/users/timm/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-e_asin.o): In functionieee754_asin': d:\ivan\projects\arduinoesp\toolchain\dl\esp-newlib\build\xtensa-lx106-elf\newlib\libm\math/../../../../../newlib/libm/math/e_asin.c:104: undefined reference to `ieee754_sqrt' collect2.exe: error: ld returned 1 exit status Error compiling.

I'm on 1.6.5 of the IDE, and did a remove/replace of the ESP8266 board support package - no change in displayed error message. Windows dev environment.

Any idea how to mitigate this? tim

[Testato]

@erhome00 I followed exactly what krulkip wrote

worked on Win7-64

[erhome00]

Thanks for the replies. It was my mistake...got to use the Stageing version and not the Stable version. The change was not yet migrated to the Stable...

Now everything works just fine!

Thanks for that nice fix!

[aniston]

Just to confirm, changing the libm.a with the link supplied by Krulkip and the error with - undefined reference to `__ieee754_sqrt' is no more, code compiles and works.

I had to change the file in this folder :: C:\Users\aniston\AppData\Roaming\Arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\1.20.0-26-gb404fb9\xtensa-lx106-elf\lib

Arduino: 1.6.5 (Windows 7 x64), Generic ESP8266 Module, Serial, 80 MHz, 40MHz, DIO, 115200, 512K (64K SPIFFS)

[cuillerj]

I got the same problem and did exactly what krulkip wrote. And it works Thanks

[QuadTinnakon]

c:/users/n_sam/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+0x4): undefined reference to __ieee754_sqrt' c:/users/n_sam/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 functionsqrt': 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' c:/users/n_sam/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-e_asin.o): In functionieee754_asin': d:\ivan\projects\arduinoesp\toolchain\dl\esp-newlib\build\xtensa-lx106-elf\newlib\libm\math/../../../../../newlib/libm/math/e_asin.c:104: undefined reference to `ieee754_sqrt' collect2.exe: error: ld returned 1 exit status Error compiling.

What causes. Thanks.

[mytot]

while i am downloading krulkip file, it was of 165KB, and previoius one is 2MB, and after replacing the file i am getting below error.

Arduino: 1.6.5 (Windows 8.1), Board: "Generic ESP8266 Module, Serial, 80 MHz, 40MHz, DIO, 115200, 512K (64K SPIFFS)"

c:/users/shann/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: file not recognized: File format not recognized collect2.exe: error: ld returned 1 exit status Error compiling.

This report would have more information with "Show verbose output during compilation" enabled in File > Preferences.

Help me in resolving the issue

[aniston]

@mytot I think you have the wrong path, try downloading it into c:\users\shann\AppData\Roaming\Arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\1.20.0-26-gb404fb9\xtensa-lx106-elf\lib

EDIT: @mytot sorry for the confusion, please ignore the path suggestion above as it points to the same folder you have used, can only confirm that the file size of libm.a is 1051142 bytes

[DiegoDVG]

hi!

this is my problem

Arduino:1.6.5 (Windows 8.1), Placa:"Generic ESP8266 Module, Serial, 80 MHz, 40MHz, DIO, 115200, 512K (64K SPIFFS)"

c:/users/diego/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/diego/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 functionsqrt': 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 de compilación

This report would have more information with "Show verbose output during compilation" activala desde Archivo > Preferencias

win 10 pro

I try to use MPU6050

[nabkey-zz]

@mytot The reason you're having the issue is that @krulkip posted a file that's in an archive - you have to extract it first, instead of just renaming the archive file.

[jwschull]

Got a couple issues... NOTE: I'm using the build from 11/10 (1.6.7) 1) Getting this error:Invalid library found in C:\Users\JerryHB\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\1.6.5-947-g39819f0\libraries\esp8266: C:\Users\JerryHB\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\1.6.5-947-g39819f0\libraries\esp8266

If I go there (i.e."C:\Users\JerryHB\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\1.6.5-947-g39819f0\libraries\esp8266") I see only 1 directory "Examples" and Nothing else. No library.

2) per nabkey's suggestion I extracted the archive and replaced it. (i.e. "C:\Users\JerryHB\AppData\Local\Arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\1.20.0-26-gb404fb9\xtensa-lx106-elf\lib" The file libm.a went from 2202KB -> 1027K.

It now compiles, But I'm still getting the error #1 above and a warning (i.e. "Warning: platform.txt from core 'ESP8266 Modules' contains deprecated recipe.ar.pattern="{compiler.path}{compiler.ar.cmd}" {compiler.ar.flags} {compiler.ar.extra_flags} "{build.path}/{archive_file}" "{object_file}", automatically converted to recipe.ar.pattern="{compiler.path}{compiler.ar.cmd}" {compiler.ar.flags} {compiler.ar.extra_flags} "{archive_file_path}" "{object_file}". Consider upgrading this core.")

[homerruma]

@krulkip Thanks, whit your lib there is no problem

[Hopperpop]

The lib from krulkip works for all functions I need, except "fmod". It gives this error:

c:/users/xxx/appdata/roaming/arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/1.20.0-26-gb404fb9-2/bin/../lib/gcc/xtensa-lx106-elf/4.8.2/../../../../xtensa-lx106-elf/lib\libm.a(lib_a-e_fmod.o):(.literal+0x4): undefined reference to __ieee754_remainder' c:/users/xxx/appdata/roaming/arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/1.20.0-26-gb404fb9-2/bin/../lib/gcc/xtensa-lx106-elf/4.8.2/../../../../xtensa-lx106-elf/lib\libm.a(lib_a-e_fmod.o): In functionieee754_fmod': e_fmod.c:(.text+0x48): undefined reference to `ieee754_remainder' collect2.exe: error: ld returned 1 exit status

[pacobyte]

Thank you, @krulkip. After replacing the file as you suggested, it now works for me, too.

[jwschull]

I got it working.. Thanks

From: Testato [mailto:notifications@github.com] Sent: Thursday, November 26, 2015 9:44 AM To: esp8266/Arduino Arduino@noreply.github.com Cc: jwschull jwschull@bellsouth.net Subject: Re: [Arduino] Stable version libm.a compilation error (#612)

I tried the actual stable version of the core and this problem is not present.are you tried ? I think this issue can be closed

— Reply to this email directly or view it on GitHub https://github.com/esp8266/Arduino/issues/612#issuecomment-159930296 . https://github.com/notifications/beacon/APDikqUaBYz5aYqsghWO4Zt-KT0rsrUyks5pJxIugaJpZM4FfpxF.gif

[bmitov]

I just installed the stable version as well as rc2 - tested both. I have the same problem: :/users/mitov/appdata/local/arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/1.20.0-26-gb404fb9-2/bin/../lib/gcc/xtensa-lx106-elf/4.8.2/../../../../xtensa-lx106-elf/lib\libm.a(lib_a-e_fmod.o):(.literal+0x0): undefined reference to `__ieee754_remainder'

c:/users/mitov/appdata/local/arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/1.20.0-26-gb404fb9-2/bin/../lib/gcc/xtensa-lx106-elf/4.8.2/../../../../xtensa-lx106-elf/lib\libm.a(lib_a-e_fmod.o): In function __ieee754_fmod': e_fmod.c:(.text+0x48): undefined reference to__ieee754_remainder' collect2.exe: error: ld returned 1 exit status

I also tested by replacing the libm.a file posted by @krulkip but the error persists. This bug is not fixed at least in the distributions available from here: http://arduino.esp8266.com/staging/package_esp8266com_index.json

[aquarat]

I'm also experiencing this issue, specifically when trying to use Adafruit's GPS parsing library.

[ketancool203]

Hey Guys , I wanted to connect esp8266 with MPU6050. Such that it sends data to the particular ip address.Please help and provide me how to do it.

[bmitov]

Moving here from #1385. Is there any solution for this? This is a very serious issue, and a serious roadblock, that seems to affect a number of functions. Any workarounds?

[igrr]

The missing function is not enabled in libm build. libm relies on the one provided by libgcc, but xtensa libgcc doesn't provide one. So newlib has to be patched, and the implementation provided by newlib enabled.

As a workaround, you can copy the source of this function from newlib and add it to some .c file inside your sketch (if you are shipping a library, than add this .c file to your library). You can also mark this function with "weak" attribute so that everything will still work once upstream libm is fixed.

On Fri, Jan 8, 2016, 13:45 bmitov notifications@github.com wrote:

Moving here from #1385 https://github.com/esp8266/Arduino/issues/1385. Is there any solution for this? This is a very serious issue, and a serious roadblock, that seems to affect a number of functions. Any workarounds?

— Reply to this email directly or view it on GitHub https://github.com/esp8266/Arduino/issues/612#issuecomment-169902621.

[Hopperpop]

I use this as workaround. It's simple and it works for me.

double floatmod(double a, double b)
{
    return (a - b * floor(a / b));
}

[bmitov]

Thank you igrr! Where I can find the source of the newlib for the ESP8266 ? I can open request for this with their team. Alternatively a file containing the function as source can be temporary included in the ESP8266 libraries, until newlib is fixed. I am not sure what is the best approach considering that this has wide spread effect on many libraries, and should be fixed. For now I will add conditional defines in the Visuino libraries to handle the ESP8266 with the workaround suggested by Hopperpop(Thank you for the workaround, it seems to work well so far!).

[igrr]

1752 addresses fmod issue.

[umarjunaid]

Thanks to @krulkip and aniston for there comments which solve my problem

@krulkip said: This seems to refer to a fix for this issue, but not sure how to try jcmvbkbc/crosstool-NG@b404fb9

aniston said: Just to confirm, changing the libm.a with the link supplied by Krulkip and the error with - undefined reference to `__ieee754_sqrt' is no more, code compiles and works.

I had to change the file in this folder :: C:\Users\aniston\AppData\Roaming\Arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\1.20.0-26-gb404fb9\xtensa-lx106-elf\lib

Arduino: 1.6.5 (Windows 7 x64), Generic ESP8266 Module, Serial, 80 MHz, 40MHz, DIO, 115200, 512K (64K SPIFFS)

[umarjunaid]

sorry

@krulkip said: I installed this libm.a file replacing the xisting one in 1.20.0-26-gb404fb9/xtensa-lx106-elf/lib/ and the error was solved. https://files.gitter.im/esp8266/Arduino/Abqa/libm.a.tbz

[anilkunchalaece]

i am Facing the Error `

c:/users/med/appdata/local/arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/1.20.0-26-gb404fb9-2/bin/../lib/gcc/xtensa-lx106-elf/4.8.2/../../../../xtensa-lx106-elf/lib\libm.a(lib_a-e_fmod.o):(.literal+0x0): undefined reference to `__ieee754_remainder'

c:/users/med/appdata/local/arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/1.20.0-26-gb404fb9-2/bin/../lib/gcc/xtensa-lx106-elf/4.8.2/../../../../xtensa-lx106-elf/lib\libm.a(lib_a-e_fmod.o): In function `__ieee754_fmod':

e_fmod.c:(.text+0x48): undefined reference to `__ieee754_remainder'

collect2.exe: error: ld returned 1 exit status

exit status 1
Error compiling for board NodeMCU 1.0 (ESP-12E Module).`

I Did replace the file libm.a But I am facing the Same Error.

I am Trying to use the Adafruit Ultimate Gps Library with NodeMCU

[dkgrieshammer]

thanks Hopperpop, thats it :)

[kjhulin]

I am having this same error, using Adafruit Ultimate GPS library with the ESP8266WiFi

Using Arduino 1.8.2 on Windows 10; using Adafruit GPS Library 1.0.2.

I've attempted to replace libm.a as suggested above, but still see the following compile-time error:

"C:\Users\Kevin\Documents\ArduinoData\packages\esp8266\tools\xtensa-lx106-elf-gcc\1.20.0-26-gb404fb9-2/bin/xtensa-lx106-elf-gcc" -g -w -Os -nostdlib -Wl,--no-check-sections -u call_user_start -Wl,-static "-LC:\Users\Kevin\Documents\ArduinoData\packages\esp8266\hardware\esp8266\2.3.0/tools/sdk/lib" "-LC:\Users\Kevin\Documents\ArduinoData\packages\esp8266\hardware\esp8266\2.3.0/tools/sdk/ld" "-Teagle.flash.4m.ld" -Wl,--gc-sections -Wl,-wrap,system_restart_local -Wl,-wrap,register_chipv6_phy -o "C:\Users\Kevin\AppData\Local\Temp\arduino_build_258862/sketch_mar30a.ino.elf" -Wl,--start-group "C:\Users\Kevin\AppData\Local\Temp\arduino_build_258862\sketch\sketch_mar30a.ino.cpp.o" "C:\Users\Kevin\AppData\Local\Temp\arduino_build_258862\libraries\ESP8266WiFi\ESP8266WiFi.cpp.o" "C:\Users\Kevin\AppData\Local\Temp\arduino_build_258862\libraries\ESP8266WiFi\ESP8266WiFiAP.cpp.o" "C:\Users\Kevin\AppData\Local\Temp\arduino_build_258862\libraries\ESP8266WiFi\ESP8266WiFiGeneric.cpp.o" "C:\Users\Kevin\AppData\Local\Temp\arduino_build_258862\libraries\ESP8266WiFi\ESP8266WiFiMulti.cpp.o" "C:\Users\Kevin\AppData\Local\Temp\arduino_build_258862\libraries\ESP8266WiFi\ESP8266WiFiSTA.cpp.o" "C:\Users\Kevin\AppData\Local\Temp\arduino_build_258862\libraries\ESP8266WiFi\ESP8266WiFiScan.cpp.o" "C:\Users\Kevin\AppData\Local\Temp\arduino_build_258862\libraries\ESP8266WiFi\WiFiClient.cpp.o" "C:\Users\Kevin\AppData\Local\Temp\arduino_build_258862\libraries\ESP8266WiFi\WiFiClientSecure.cpp.o" "C:\Users\Kevin\AppData\Local\Temp\arduino_build_258862\libraries\ESP8266WiFi\WiFiServer.cpp.o" "C:\Users\Kevin\AppData\Local\Temp\arduino_build_258862\libraries\ESP8266WiFi\WiFiUdp.cpp.o" "C:\Users\Kevin\AppData\Local\Temp\arduino_build_258862\libraries\Adafruit_MQTT_Library\Adafruit_MQTT.cpp.o" "C:\Users\Kevin\AppData\Local\Temp\arduino_build_258862\libraries\Adafruit_MQTT_Library\Adafruit_MQTT_Client.cpp.o" "C:\Users\Kevin\AppData\Local\Temp\arduino_build_258862\libraries\Adafruit_GPS-master\Adafruit_GPS.cpp.o" "C:\Users\Kevin\AppData\Local\Temp\arduino_build_258862\libraries\SPI\SPI.cpp.o" "C:\Users\Kevin\AppData\Local\Temp\arduino_build_258862\libraries\Wire\Wire.cpp.o" "C:\Users\Kevin\AppData\Local\Temp\arduino_build_258862\libraries\Adafruit_GFX_Library\glcdfont.c.o" "C:\Users\Kevin\AppData\Local\Temp\arduino_build_258862\libraries\Adafruit_GFX_Library\Adafruit_GFX.cpp.o" "C:\Users\Kevin\AppData\Local\Temp\arduino_build_258862\libraries\Adafruit_SSD1306\Adafruit_SSD1306.cpp.o" "C:\Users\Kevin\AppData\Local\Temp\arduino_build_258862/arduino.ar" -lm -lgcc -lhal -lphy -lpp -lnet80211 -lwpa -lcrypto -lmain -lwps -laxtls -lsmartconfig -lmesh -lwpa2 -llwip_gcc -lstdc++ -Wl,--end-group "-LC:\Users\Kevin\AppData\Local\Temp\arduino_build_258862" c:/users/kevin/documents/arduinodata/packages/esp8266/tools/xtensa-lx106-elf-gcc/1.20.0-26-gb404fb9-2/bin/../lib/gcc/xtensa-lx106-elf/4.8.2/../../../../xtensa-lx106-elf/lib\libm.a(lib_a-e_fmod.o):(.literal+0x0): undefined reference to__ieee754_remainder'

c:/users/kevin/documents/arduinodata/packages/esp8266/tools/xtensa-lx106-elf-gcc/1.20.0-26-gb404fb9-2/bin/../lib/gcc/xtensa-lx106-elf/4.8.2/../../../../xtensa-lx106-elf/lib\libm.a(lib_a-e_fmod.o): In function `__ieee754_fmod':

e_fmod.c:(.text+0x48): undefined reference to '__ieee754_remainder'

collect2.exe: error: ld returned 1 exit status

Using library ESP8266WiFi at version 1.0 in folder: C:\Users\Kevin\Documents\ArduinoData\packages\esp8266\hardware\esp8266\2.3.0\libraries\ESP8266WiFi Using library Adafruit_MQTT_Library at version 0.17.0 in folder: C:\Users\Kevin\Documents\Arduino\libraries\Adafruit_MQTT_Library Using library Adafruit_GPS-master at version 1.0.2 in folder: C:\Users\Kevin\Documents\Arduino\libraries\Adafruit_GPS-master Using library SPI at version 1.0 in folder: C:\Users\Kevin\Documents\ArduinoData\packages\esp8266\hardware\esp8266\2.3.0\libraries\SPI Using library Wire at version 1.0 in folder: C:\Users\Kevin\Documents\ArduinoData\packages\esp8266\hardware\esp8266\2.3.0\libraries\Wire Using library Adafruit_GFX_Library at version 1.1.8 in folder: C:\Users\Kevin\Documents\Arduino\libraries\Adafruit_GFX_Library Using library Adafruit_SSD1306 at version 1.1.2 in folder: C:\Users\Kevin\Documents\Arduino\libraries\Adafruit_SSD1306 exit status 1 Error compiling for board Adafruit HUZZAH ESP8266. `

[mjs513]

I am getting a similar error for fmod: Archiving built core (caching) in: C:\Users\CYBERP~1\AppData\Local\Temp\arduino_cache_461718\core\core_esp8266_esp8266_generic_CpuFrequency_80,FlashFreq_40,FlashMode_dio,UploadSpeed_115200,FlashSize_512K64,ResetMethod_ck,Debug_Disabled,DebugLevel_None_____6f0ffaa82fb8685893767509385827e5.a c:/users/cyberpalin/appdata/local/arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/1.20.0-26-gb404fb9-2/bin/../lib/gcc/xtensa-lx106-elf/4.8.2/../../../../xtensa-lx106-elf/lib\libm.a(lib_a-e_fmod.o):(.literal+0x0): undefined reference to__ieee754_remainder'

c:/users/cyberpalin/appdata/local/arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/1.20.0-26-gb404fb9-2/bin/../lib/gcc/xtensa-lx106-elf/4.8.2/../../../../xtensa-lx106-elf/lib\libm.a(lib_a-e_fmod.o): In function `__ieee754_fmod':

e_fmod.c:(.text+0x48): undefined reference to `__ieee754_remainder'

collect2.exe: error: ld returned 1 exit status

exit status 1 Error compiling for board Generic ESP8266 Module. ` I am IDE1.8.5, Windows 10, stable release 2.3.0. Is there an easy fix for this or do I have to wait for a new release?

Thanks Mike

EDIT: Ok. Think I got my answer to this from xtensa error #3216 issue. Its only fixed in master branch?

[devyte]

@mjs513 Staged for release means the issue was found before 2.3.0, and has been already fixed in master branch. So try latest git.

[KevinLod]

@igrr
Im having a problem with my IDE exec: "C:\Users\Doesn't matter\AppData\Local\Arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\1.20.0-26-gb404fb9-2/bin/xtensa-lx106-elf-g++": file does not exist

would you please help me fixing this issue I've tried many ways to fix it but i couldn't