Stable version libm.a compilation error #612

ghost · 2015-07-25T10:06:42Z

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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The text was updated successfully, but these errors were encountered:

krulkip · 2015-07-26T06:04:34Z

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 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

forkineye · 2015-07-28T17:23:08Z

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 · 2015-07-28T17:38:36Z

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 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

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#612 (comment).

forkineye · 2015-07-28T17:55:35Z

@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 · 2015-08-04T14:02:48Z

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 · 2015-08-08T21:41:33Z

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

igrr · 2015-08-09T09:06:03Z

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
jcmvbkbc/crosstool-NG@b404fb9

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Reply to this email directly or view it on GitHub
#612 (comment).

krulkip · 2015-08-09T09:52:23Z

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 · 2015-08-22T23:24:17Z

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

Is it solved on Staging Version ?

locchi93 · 2015-08-30T08:27:25Z

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

Testato · 2015-08-30T12:36:13Z

@krulkip
Thanks, whit your lib there is no problem

erhome00 · 2015-09-04T11:16:09Z

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 · 2015-09-06T18:09:04Z

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 function__ieee754_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 · 2015-09-06T18:33:56Z

@erhome00
I followed exactly what krulkip wrote

worked on Win7-64

erhome00 · 2015-09-07T06:28:25Z

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 · 2015-09-27T16:55:44Z

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 · 2015-09-28T07:21:36Z

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

QuadTinnakon · 2015-09-29T03:38:26Z

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 function__ieee754_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 · 2015-10-25T20:55:24Z

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 · 2015-10-25T23:30:11Z

~~@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 · 2015-10-27T00:08:14Z

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 · 2015-10-27T20:50:51Z

@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 · 2015-11-10T17:48:56Z

Got a couple issues... NOTE: I'm using the build from 11/10 (1.6.7)

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.

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 · 2015-11-12T10:17:24Z

@krulkip
Thanks, whit your lib there is no problem

Hopperpop · 2015-11-12T18:41:35Z

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 function__ieee754_fmod':
e_fmod.c:(.text+0x48): undefined reference to `__ieee754_remainder'
collect2.exe: error: ld returned 1 exit status

esp8266/Arduino#612

igrr · 2016-04-19T09:54:38Z

#1752 addresses fmod issue.

umarjunaid · 2016-06-29T18:32:14Z

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 · 2016-06-29T18:33:06Z

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 · 2016-08-11T17:07:31Z

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 · 2016-08-12T09:20:47Z

thanks Hopperpop, thats it :)

kjhulin · 2017-04-15T00:07:35Z

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 · 2017-12-18T22:28:49Z

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 · 2017-12-19T04:00:20Z

@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 · 2018-05-11T05:39:09Z

@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

krulkip mentioned this issue Aug 2, 2015

compile error probonopd/ESP8266HueEmulator#12

Closed

igrr closed this as completed in 5c410c7 Aug 10, 2015

igrr reopened this Aug 10, 2015

igrr added the component: tools label Nov 5, 2015

igrr added this to the 2.0.0 milestone Nov 5, 2015

igrr modified the milestones: 2.2.0, 2.1.0 Feb 27, 2016

igrr modified the milestones: 2.2.0, 2.3.0 Apr 18, 2016

igrr added a commit to igrr/newlib-xtensa that referenced this issue Apr 19, 2016

Enable full fmod implementation

b420bb7

esp8266/Arduino#612

igrr added a commit to igrr/newlib-xtensa that referenced this issue Apr 19, 2016

Enable full fmod implementation

32a76d2

esp8266/Arduino#612

igrr added component: libc type: bug labels Apr 19, 2016

igrr modified the milestones: 2.3.0, 2.4.0 Jun 3, 2016

igrr added a commit that referenced this issue Jun 23, 2016

Add tests for sqrt, fmod (#612) and floating point printf/scanf (#1179)

5e3df08

igrr added the staged-for-release label Jul 4, 2016

minyk mentioned this issue Nov 21, 2016

libm.a problem: missing __ieee754_remainder function? espressif/arduino-esp32#62

Closed

igrr mentioned this issue May 8, 2017

xtensa error #3216

Closed

igrr closed this as completed Jan 2, 2018

igrr removed the staged-for-release label Jan 2, 2018

xoseperez mentioned this issue Jan 24, 2018

Error when compiling sonoff-pow (w_sqrt.c:69: undefined reference to `__ieee754_sqrt') xoseperez/espurna#63

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Stable version libm.a compilation error #612

Stable version libm.a compilation error #612

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Stable version libm.a compilation error #612

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

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