Unable to cache built core, please tell esp8266 maintainers to follow http://goo.gl/QdCUjo

[philbowles]

• [ x] This issue complies with the issue POLICY doc.
• I have read the documentation at readthedocs and the issue is not addressed there.
• I have tested that the issue is present in current master branch (aka latest git).
• [ x] I have searched the issue tracker for a similar issue.
• If there is a stack dump, I have decoded it.
• [ x] I have filled out all fields below.

Platform

• Hardware: all
• Core Version: 2.4.2
• Development Env: Arduino IDE 1.8.7
• Operating System: Windows 10

Settings in IDE

N/A happens on every occasion , multiple boards, speeds etc

Problem Description

Since installing Arduino IDE 1.8.7 I notice the following message in all builds.
"Unable to cache built core, please tell esp8266 maintainers to follow http://goo.gl/QdCUjo"
The builds works fine, nothing else seems affected, just wondering a) if you are aware b) what it means

"C:\\Users\\phil\\AppData\\Local\\Temp\\arduino_build_567284/arduino.ar" "C:\\Users\\phil\\AppData\\Local\\Temp\\arduino_build_567284\\core\\umm_malloc\\umm_malloc.c.o"
**_Unable to cache built core, please tell esp8266 maintainers to follow http://goo.gl/QdCUjo_**
Linking everything together...
"C:\\Users\\phil\\AppData\\Local\\Arduino15\\packages\\esp8266\\tools\\xtensa-lx106-elf-gcc\\1.20.0-26-gb404fb9-2/bin/xtensa-lx106-elf-gcc" -CC -E -P -DVTABLES_IN_FLASH "C:\\Users\\phil\\AppData\\Local\\Arduino15\\packages\\esp8266\\hardware\\esp8266\\2.4.2/tools/sdk/ld/eagle.app.v6.common.ld.h" -o "C:\\Users\\phil\\AppData\\Local\\Arduino15\\packages\\esp8266\\hardware\\esp8266\\2.4.2/tools/sdk/ld/eagle.app.v6.common.ld"
...

[devyte]

CC @d-a-v

[5chufti]

Does the same problem (message) occur with the git version?

[per1234]

This was fixed by 85e6809#diff-d638a47d1ca0e2a5585fb34c7d7fb0f9L95

[devyte]

Closing per previous comment.

[ElFishi]

I have the same problem, but I have no clue how to fix it with the information given here. Can you help me out? I'm using the Arduino IDE 1.8.7 under Windows 10

[per1234]

@ElFishi just ignore that message. This won't cause any problems for you other than a slower compilation time. The purpose of the message is to prompt hardware package authors to make the change needed to support caching. That has been accomplished here already. The warning will be fixed in the next release of the ESP8266 core for Arduino.

[ElFishi]

Thanks fort responding, but it does cause a problem for me. I am missing the .ino.bin file that I use for a web update for my remote ESP8266.
With IDE 1.8.4 the file is generated, with 1.8.7 it isn't.

[per1234]

I can't reproduce that and I don't see what makes you think that problem is related to the core not being archived. Using Arduino IDE 1.8.7 and ESP8266 Core For Arduino 2.4.2, I get a .ino.bin file in the temporary build folder and I also get one in the sketch folder when I do Sketch > Export Compiled Binary. It seems to be off topic here.

[hbk001]

Seems to be a ESP32 dev board problem only, works ok with ESP8266. Tested latest versions of all involdved. See last lines say Sketch size say 0 :

Unable to cache built core, please tell esp32 maintainers to follow http://goo.gl/QdCUjo
Linking everything together...
"C:\Users\pasca\AppData\Local\Arduino15\packages\esp32\tools\xtensa-esp32-elf-gcc\1.22.0-80-g6c4433a-5.2.0/bin/xtensa-esp32-elf-gcc" -nostdlib "-LC:\Users\pasca\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.0/tools/sdk/lib" "-LC:\Users\pasca\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.0/tools/sdk/ld" -T esp32_out.ld -T esp32.common.ld -T esp32.rom.ld -T esp32.peripherals.ld -T esp32.rom.spiram_incompatible_fns.ld -u ld_include_panic_highint_hdl -u call_user_start_cpu0 -Wl,--gc-sections -Wl,-static -Wl,--undefined=uxTopUsedPriority -u __cxa_guard_dummy -u __cxx_fatal_exception -Wl,--start-group "C:\Users\pasca\AppData\Local\Temp\arduino_build_942850\sketch\HB_PWM_AD_1W_METER_021117.ino.cpp.o" "C:\Users\pasca\AppData\Local\Temp\arduino_build_942850\libraries\WiFi\ETH.cpp.o" "C:\Users\pasca\AppData\Local\Temp\arduino_build_942850\libraries\WiFi\WiFi.cpp.o" "C:\Users\pasca\AppData\Local\Temp\arduino_build_942850\libraries\WiFi\WiFiAP.cpp.o" "C:\Users\pasca\AppData\Local\Temp\arduino_build_942850\libraries\WiFi\WiFiClient.cpp.o" "C:\Users\pasca\AppData\Local\Temp\arduino_build_942850\libraries\WiFi\WiFiGeneric.cpp.o" "C:\Users\pasca\AppData\Local\Temp\arduino_build_942850\libraries\WiFi\WiFiMulti.cpp.o" "C:\Users\pasca\AppData\Local\Temp\arduino_build_942850\libraries\WiFi\WiFiSTA.cpp.o" "C:\Users\pasca\AppData\Local\Temp\arduino_build_942850\libraries\WiFi\WiFiScan.cpp.o" "C:\Users\pasca\AppData\Local\Temp\arduino_build_942850\libraries\WiFi\WiFiServer.cpp.o" "C:\Users\pasca\AppData\Local\Temp\arduino_build_942850\libraries\WiFi\WiFiUdp.cpp.o" "C:\Users\pasca\AppData\Local\Temp\arduino_build_942850\libraries\WebServer\Parsing.cpp.o" "C:\Users\pasca\AppData\Local\Temp\arduino_build_942850\libraries\WebServer\WebServer.cpp.o" "C:\Users\pasca\AppData\Local\Temp\arduino_build_942850\libraries\WebServer\detail\mimetable.cpp.o" "C:\Users\pasca\AppData\Local\Temp\arduino_build_942850\libraries\ESPmDNS\ESPmDNS.cpp.o" "C:\Users\pasca\AppData\Local\Temp\arduino_build_942850\libraries\OneWire\OneWire.cpp.o" "C:\Users\pasca\AppData\Local\Temp\arduino_build_942850\libraries\FS\FS.cpp.o" "C:\Users\pasca\AppData\Local\Temp\arduino_build_942850\libraries\FS\vfs_api.cpp.o" "C:\Users\pasca\AppData\Local\Temp\arduino_build_942850/arduino.ar" -lgcc -lopenssl -lbtdm_app -lfatfs -lwps -lcoexist -lwear_levelling -lesp_http_client -lhal -lnewlib -ldriver -lbootloader_support -lpp -lmesh -lsmartconfig -ljsmn -lwpa -lethernet -lphy -lapp_trace -lconsole -lulp -lwpa_supplicant -lfreertos -lbt -lmicro-ecc -lcxx -lxtensa-debug-module -lmdns -lvfs -lsoc -lcore -lsdmmc -lcoap -ltcpip_adapter -lc_nano -lesp-tls -lrtc -lspi_flash -lwpa2 -lesp32 -lapp_update -lnghttp -lspiffs -lespnow -lnvs_flash -lesp_adc_cal -llog -lsmartconfig_ack -lexpat -lm -lc -lheap -lmbedtls -llwip -lnet80211 -lpthread -ljson -lstdc++ -Wl,--end-group -Wl,-EL -o "C:\Users\pasca\AppData\Local\Temp\arduino_build_942850/HB_PWM_AD_1W_METER_021117.ino.elf"
"C:\Users\pasca\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.0/tools/gen_esp32part.exe" -q "C:\Users\pasca\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.0/tools/partitions/default.csv" "C:\Users\pasca\AppData\Local\Temp\arduino_build_942850/HB_PWM_AD_1W_METER_021117.ino.partitions.bin"
"C:\Users\pasca\AppData\Local\Arduino15\packages\esp32\tools\esptool\2.3.1/esptool.exe" --chip esp32 elf2image --flash_mode dio --flash_freq 80m --flash_size 4MB -o "C:\Users\pasca\AppData\Local\Temp\arduino_build_942850/HB_PWM_AD_1W_METER_021117.ino.bin" "C:\Users\pasca\AppData\Local\Temp\arduino_build_942850/HB_PWM_AD_1W_METER_021117.ino.elf"
esptool.py v2.3.1

Multiple libraries were found for "WiFi.h"
Used: C:\Users\pasca\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.0\libraries\WiFi
Not used: C:\Program Files (x86)\Arduino\libraries\WiFi
Using library WiFi at version 1.0 in folder: C:\Users\pasca\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.0\libraries\WiFi
Using library WebServer at version 1.0 in folder: C:\Users\pasca\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.0\libraries\WebServer
Using library ESPmDNS at version 1.0 in folder: C:\Users\pasca\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.0\libraries\ESPmDNS
Using library OneWire at version 2.3.4 in folder: F:\D\ARDUINO\libraries\OneWire
Using library FS at version 1.0 in folder: C:\Users\pasca\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.0\libraries\FS
"C:\Users\pasca\AppData\Local\Arduino15\packages\esp32\tools\xtensa-esp32-elf-gcc\1.22.0-80-g6c4433a-5.2.0/bin/xtensa-esp32-elf-size" -A "C:\Users\pasca\AppData\Local\Temp\arduino_build_942850/HB_PWM_AD_1W_METER_021117.ino.elf"
Sketch uses 0 bytes (0%) of program storage space. Maximum is 1310720 bytes.
Global variables use 0 bytes (0%) of dynamic memory, leaving 327680 bytes for local variables. Maximum is 327680 bytes.