user48274: At early morning i have accidentally the error of GNOME for my OS, so I was forced reinstall my OS couse i don't have any backup for my packages and my database. i'm installed Arduino-IDE 1.8.7, Arduino AVR Boards 1.6.23 and Esp8266 Boards 2.4.2 . when i trying to upload my sketch, i get this error:
...
Unable to cache built core, please tell esp8266 maintainers to follow http://goo.gl/QdCUjo
...

I see the link, but i cannot see where my archive variable in platform file for my cores.
...
## Create archives
recipe.ar.pattern="{compiler.path}{compiler.ar.cmd}" {compiler.ar.flags} {compiler.ar.extra_flags} "{build.path}/arduino.ar" "{object_file}"
...

See my verbose log !!!.
/home/praz/.arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/1.20.0-26-gb404fb9-2/bin/xtensa-lx106-elf-ar cru /tmp/arduino_build_988288/arduino.ar /tmp/arduino_build_988288/core/spiffs_api.cpp.o
/home/praz/.arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/1.20.0-26-gb404fb9-2/bin/xtensa-lx106-elf-ar cru /tmp/arduino_build_988288/arduino.ar /tmp/arduino_build_988288/core/spiffs_hal.cpp.o
/home/praz/.arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/1.20.0-26-gb404fb9-2/bin/xtensa-lx106-elf-ar cru /tmp/arduino_build_988288/arduino.ar /tmp/arduino_build_988288/core/time.c.o
/home/praz/.arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/1.20.0-26-gb404fb9-2/bin/xtensa-lx106-elf-ar cru /tmp/arduino_build_988288/arduino.ar /tmp/arduino_build_988288/core/uart.c.o
/home/praz/.arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/1.20.0-26-gb404fb9-2/bin/xtensa-lx106-elf-ar cru /tmp/arduino_build_988288/arduino.ar /tmp/arduino_build_988288/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...
/home/praz/.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 /home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/tools/sdk/ld/eagle.app.v6.common.ld.h -o /home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/tools/sdk/ld/eagle.app.v6.common.ld
/home/praz/.arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/1.20.0-26-gb404fb9-2/bin/xtensa-lx106-elf-gcc -Wl,-Map -Wl,/tmp/arduino_build_988288/tesHC139.ino.map -g -w -Os -nostdlib -Wl,--no-check-sections -u app_entry -u _printf_float -u _scanf_float -Wl,-static -L/home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/tools/sdk/lib -L/home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/tools/sdk/ld -L/home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/tools/sdk/libc/xtensa-lx106-elf/lib -Teagle.flash.4m1m.ld -Wl,--gc-sections -Wl,-wrap,system_restart_local -Wl,-wrap,spi_flash_read -o /tmp/arduino_build_988288/tesHC139.ino.elf -Wl,--start-group /tmp/arduino_build_988288/sketch/tesHC139.ino.cpp.o /tmp/arduino_build_988288/libraries/SPI/SPI.cpp.o /tmp/arduino_build_988288/libraries/Adafruit_BME280_Library-master/Adafruit_BME280.cpp.o /tmp/arduino_build_988288/libraries/Wire/Wire.cpp.o /tmp/arduino_build_988288/arduino.ar -lhal -lphy -lpp -lnet80211 -llwip2 -lwpa -lcrypto -lmain -lwps -lbearssl -laxtls -lespnow -lsmartconfig -lairkiss -lwpa2 -lstdc++ -lm -lc -lgcc -Wl,--end-group -L/tmp/arduino_build_988288
/home/praz/.arduino15/packages/esp8266/tools/esptool/0.4.13/esptool -eo /home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/bootloaders/eboot/eboot.elf -bo /tmp/arduino_build_988288/tesHC139.ino.bin -bm dio -bf 40 -bz 4M -bs .text -bp 4096 -ec -eo /tmp/arduino_build_988288/tesHC139.ino.elf -bs .irom0.text -bs .text -bs .data -bs .rodata -bc -ec
Using library SPI at version 1.0 in folder: /home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/libraries/SPI 
Using library Adafruit_Sensor-master at version 1.0.2 in folder: /home/praz/Arduino/libraries/Adafruit_Sensor-master 
Using library Adafruit_BME280_Library-master at version 1.0.7 in folder: /home/praz/Arduino/libraries/Adafruit_BME280_Library-master 
Using library Wire at version 1.0 in folder: /home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/libraries/Wire 
/home/praz/.arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/1.20.0-26-gb404fb9-2/bin/xtensa-lx106-elf-size -A /tmp/arduino_build_988288/tesHC139.ino.elf
Sketch uses 259408 bytes (24%) of program storage space. Maximum is 1044464 bytes.
Global variables use 28352 bytes (34%) of dynamic memory, leaving 53568 bytes for local variables. Maximum is 81920 bytes.
/home/praz/.arduino15/packages/esp8266/tools/esptool/0.4.13/esptool -vv -cd nodemcu -cb 115200 -cp /dev/ttyUSB0 -ca 0x00000 -cf /tmp/arduino_build_988288/tesHC139.ino.bin 

I don't think so if i have permissions issue, it seems my boards is fine about my permissions.
total 388
drwxrwxr-x  8 praz praz   4096 Okt 11 00:14 ./
drwxrwxr-x  3 praz praz   4096 Okt 11 00:13 ../
-rw-rw-r--  1 praz praz 293575 Agu  3 14:19 boards.txt
drwxrwxr-x  3 praz praz   4096 Agu  3 14:19 bootloaders/
drwxrwxr-x  3 praz praz   4096 Agu  3 14:19 cores/
-rw-rw-r--  1 praz praz    235 Agu  3 14:19 .gitmodules
-rw-rw-r--  1 praz praz   2831 Agu  3 14:19 ISSUE_TEMPLATE.md
-rw-rw-r--  1 praz praz    553 Agu  3 14:19 keywords.txt
drwxrwxr-x 28 praz praz   4096 Agu  3 14:19 libraries/
-rw-rw-r--  1 praz praz  26529 Agu  3 14:19 LICENSE
-rw-rw-r--  1 praz praz    194 Agu  3 14:19 package.json
-rw-rw-r--  1 praz praz   6844 Agu  3 14:19 platform.txt
-rw-rw-r--  1 praz praz   7136 Agu  3 14:19 POLICY.md
-rw-rw-r--  1 praz praz      0 Agu  3 14:19 programmers.txt
-rw-rw-r--  1 praz praz   7722 Agu  3 14:19 README.md
drwxrwxr-x  4 praz praz   4096 Agu  3 14:19 tests/
drwxrwxr-x  3 praz praz   4096 Agu  3 14:19 tools/
drwxrwxr-x 25 praz praz   4096 Agu  3 14:19 variants/

Solved
I think when i installed Esp8266 Boards 2.4.2 latest version is fine, i uploaded my sketch and i cannot make cache to my built core, Majenko is right, my the snippet of config are difference between my 74hc139 issue and my verbose log issue.
when i installed fresh Esp8266 Boards using boards manager, that automatically downloads source code of esp8266 core on this Github, i don't understand why my snippet of config not updated like this commit. so i updated my config of boards with copy/paste on tree links of  Github, and that's works.
See my verbose below or see at this :  
/home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/tools/xtensa-lx106-elf/bin/xtensa-lx106-elf-ar cru /tmp/arduino_build_979295/core/core.a /tmp/arduino_build_979295/core/sqrt32.c.o
/home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/tools/xtensa-lx106-elf/bin/xtensa-lx106-elf-ar cru /tmp/arduino_build_979295/core/core.a /tmp/arduino_build_979295/core/time.c.o
/home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/tools/xtensa-lx106-elf/bin/xtensa-lx106-elf-ar cru /tmp/arduino_build_979295/core/core.a /tmp/arduino_build_979295/core/uart.c.o
/home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/tools/xtensa-lx106-elf/bin/xtensa-lx106-elf-ar cru /tmp/arduino_build_979295/core/core.a /tmp/arduino_build_979295/core/umm_malloc/umm_malloc.c.o
Archiving built core (caching) in: /tmp/arduino_cache_39139/core/core_8e365e854c5bfceaa27f4c371ba290d0.a
Linking everything together...
/home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/tools/xtensa-lx106-elf/bin/xtensa-lx106-elf-gcc -CC -E -P -DVTABLES_IN_FLASH /home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/tools/sdk/ld/eagle.app.v6.common.ld.h -o /tmp/arduino_build_979295/local.eagle.app.v6.common.ld
/home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/tools/xtensa-lx106-elf/bin/xtensa-lx106-elf-gcc -Wl,-Map -Wl,/tmp/arduino_build_979295/tesHC139.ino.map -g -Wall -Wextra -Os -nostdlib -Wl,--no-check-sections -u app_entry -u _printf_float -u _scanf_float -Wl,-static -L/home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/tools/sdk/lib -L/home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/tools/sdk/ld -L/home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/tools/sdk/libc/xtensa-lx106-elf/lib -Teagle.flash.4m.ld -Wl,--gc-sections -Wl,-wrap,system_restart_local -Wl,-wrap,spi_flash_read -o /tmp/arduino_build_979295/tesHC139.ino.elf -Wl,--start-group /tmp/arduino_build_979295/sketch/tesHC139.ino.cpp.o /tmp/arduino_build_979295/libraries/SPI/SPI.cpp.o /tmp/arduino_build_979295/libraries/Adafruit_BME280_Library-master/Adafruit_BME280.cpp.o /tmp/arduino_build_979295/libraries/Wire/Wire.cpp.o /tmp/arduino_build_979295/core/core.a -lhal -lphy -lpp -lnet80211 -llwip2-536-feat -lwpa -lcrypto -lmain -lwps -lbearssl -laxtls -lespnow -lsmartconfig -lairkiss -lwpa2 -lstdc++ -lm -lc -lgcc -Wl,--end-group -L/tmp/arduino_build_979295
/home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/tools/esptool/esptool -eo /home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/bootloaders/eboot/eboot.elf -bo /tmp/arduino_build_979295/tesHC139.ino.bin -bm dio -bf 40 -bz 4M -bs .text -bp 4096 -ec -eo /tmp/arduino_build_979295/tesHC139.ino.elf -bs .irom0.text -bs .text -bs .data -bs .rodata -bc -ec
Using library SPI at version 1.0 in folder: /home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/libraries/SPI 
Using library Adafruit_Sensor-master at version 1.0.2 in folder: /home/praz/Arduino/libraries/Adafruit_Sensor-master 
Using library Adafruit_BME280_Library-master at version 1.0.7 in folder: /home/praz/Arduino/libraries/Adafruit_BME280_Library-master 
Using library Wire at version 1.0 in folder: /home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/libraries/Wire 
/home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/tools/xtensa-lx106-elf/bin/xtensa-lx106-elf-size -A /tmp/arduino_build_979295/tesHC139.ino.elf
Sketch uses 265524 bytes (25%) of program storage space. Maximum is 1044464 bytes.
Global variables use 28236 bytes (34%) of dynamic memory, leaving 53684 bytes for local variables. Maximum is 81920 bytes.
/home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/tools/esptool/esptool -vv -cd nodemcu -cb 115200 -cp /dev/ttyUSB0 -ca 0x00000 -cf /tmp/arduino_build_979295/tesHC139.ino.bin 

Hope anyone can solve my issue, Thanks in advance.

user4143: This was fixed on the 20th August in this commit. Make sure you have the latest version of the ESP8266 core installed. If there hasn't been a release since that fix, you can pull the github version of the config file and use that instead of the one bundled with the core.
However, it's not a fatal error - it merely means that compilation will be slower than it should be.

48274: <p>At early morning i have accidentally the error of GNOME for my OS, so I was forced reinstall my OS couse i don't have any backup for my packages and my database. i'm installed Arduino-IDE 1.8.7, Arduino AVR Boards 1.6.23 and Esp8266 Boards 2.4.2 . when i trying to upload my sketch, i get this error:</p>

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

<p>I see the link, but i cannot see where my archive variable in platform file for my cores.</p>

<pre><code>...
## Create archives
recipe.ar.pattern="{compiler.path}{compiler.ar.cmd}" {compiler.ar.flags} {compiler.ar.extra_flags} "{build.path}/arduino.ar" "{object_file}"
...
</code></pre>

<p><strong>See</strong> my verbose <a href="http://paste.ubuntu.com/p/2n6GVkgM3m/" rel="nofollow noreferrer">log</a> !!!.</p>

<pre><code>/home/praz/.arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/1.20.0-26-gb404fb9-2/bin/xtensa-lx106-elf-ar cru /tmp/arduino_build_988288/arduino.ar /tmp/arduino_build_988288/core/spiffs_api.cpp.o
/home/praz/.arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/1.20.0-26-gb404fb9-2/bin/xtensa-lx106-elf-ar cru /tmp/arduino_build_988288/arduino.ar /tmp/arduino_build_988288/core/spiffs_hal.cpp.o
/home/praz/.arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/1.20.0-26-gb404fb9-2/bin/xtensa-lx106-elf-ar cru /tmp/arduino_build_988288/arduino.ar /tmp/arduino_build_988288/core/time.c.o
/home/praz/.arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/1.20.0-26-gb404fb9-2/bin/xtensa-lx106-elf-ar cru /tmp/arduino_build_988288/arduino.ar /tmp/arduino_build_988288/core/uart.c.o
/home/praz/.arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/1.20.0-26-gb404fb9-2/bin/xtensa-lx106-elf-ar cru /tmp/arduino_build_988288/arduino.ar /tmp/arduino_build_988288/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...
/home/praz/.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 /home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/tools/sdk/ld/eagle.app.v6.common.ld.h -o /home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/tools/sdk/ld/eagle.app.v6.common.ld
/home/praz/.arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/1.20.0-26-gb404fb9-2/bin/xtensa-lx106-elf-gcc -Wl,-Map -Wl,/tmp/arduino_build_988288/tesHC139.ino.map -g -w -Os -nostdlib -Wl,--no-check-sections -u app_entry -u _printf_float -u _scanf_float -Wl,-static -L/home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/tools/sdk/lib -L/home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/tools/sdk/ld -L/home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/tools/sdk/libc/xtensa-lx106-elf/lib -Teagle.flash.4m1m.ld -Wl,--gc-sections -Wl,-wrap,system_restart_local -Wl,-wrap,spi_flash_read -o /tmp/arduino_build_988288/tesHC139.ino.elf -Wl,--start-group /tmp/arduino_build_988288/sketch/tesHC139.ino.cpp.o /tmp/arduino_build_988288/libraries/SPI/SPI.cpp.o /tmp/arduino_build_988288/libraries/Adafruit_BME280_Library-master/Adafruit_BME280.cpp.o /tmp/arduino_build_988288/libraries/Wire/Wire.cpp.o /tmp/arduino_build_988288/arduino.ar -lhal -lphy -lpp -lnet80211 -llwip2 -lwpa -lcrypto -lmain -lwps -lbearssl -laxtls -lespnow -lsmartconfig -lairkiss -lwpa2 -lstdc++ -lm -lc -lgcc -Wl,--end-group -L/tmp/arduino_build_988288
/home/praz/.arduino15/packages/esp8266/tools/esptool/0.4.13/esptool -eo /home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/bootloaders/eboot/eboot.elf -bo /tmp/arduino_build_988288/tesHC139.ino.bin -bm dio -bf 40 -bz 4M -bs .text -bp 4096 -ec -eo /tmp/arduino_build_988288/tesHC139.ino.elf -bs .irom0.text -bs .text -bs .data -bs .rodata -bc -ec
Using library SPI at version 1.0 in folder: /home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/libraries/SPI 
Using library Adafruit_Sensor-master at version 1.0.2 in folder: /home/praz/Arduino/libraries/Adafruit_Sensor-master 
Using library Adafruit_BME280_Library-master at version 1.0.7 in folder: /home/praz/Arduino/libraries/Adafruit_BME280_Library-master 
Using library Wire at version 1.0 in folder: /home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/libraries/Wire 
/home/praz/.arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/1.20.0-26-gb404fb9-2/bin/xtensa-lx106-elf-size -A /tmp/arduino_build_988288/tesHC139.ino.elf
Sketch uses 259408 bytes (24%) of program storage space. Maximum is 1044464 bytes.
Global variables use 28352 bytes (34%) of dynamic memory, leaving 53568 bytes for local variables. Maximum is 81920 bytes.
/home/praz/.arduino15/packages/esp8266/tools/esptool/0.4.13/esptool -vv -cd nodemcu -cb 115200 -cp /dev/ttyUSB0 -ca 0x00000 -cf /tmp/arduino_build_988288/tesHC139.ino.bin 
</code></pre>

<p>I don't think so if i have permissions issue, it seems my boards is fine about my permissions.</p>

<pre><code>total 388
drwxrwxr-x  8 praz praz   4096 Okt 11 00:14 ./
drwxrwxr-x  3 praz praz   4096 Okt 11 00:13 ../
-rw-rw-r--  1 praz praz 293575 Agu  3 14:19 boards.txt
drwxrwxr-x  3 praz praz   4096 Agu  3 14:19 bootloaders/
drwxrwxr-x  3 praz praz   4096 Agu  3 14:19 cores/
-rw-rw-r--  1 praz praz    235 Agu  3 14:19 .gitmodules
-rw-rw-r--  1 praz praz   2831 Agu  3 14:19 ISSUE_TEMPLATE.md
-rw-rw-r--  1 praz praz    553 Agu  3 14:19 keywords.txt
drwxrwxr-x 28 praz praz   4096 Agu  3 14:19 libraries/
-rw-rw-r--  1 praz praz  26529 Agu  3 14:19 LICENSE
-rw-rw-r--  1 praz praz    194 Agu  3 14:19 package.json
-rw-rw-r--  1 praz praz   6844 Agu  3 14:19 platform.txt
-rw-rw-r--  1 praz praz   7136 Agu  3 14:19 POLICY.md
-rw-rw-r--  1 praz praz      0 Agu  3 14:19 programmers.txt
-rw-rw-r--  1 praz praz   7722 Agu  3 14:19 README.md
drwxrwxr-x  4 praz praz   4096 Agu  3 14:19 tests/
drwxrwxr-x  3 praz praz   4096 Agu  3 14:19 tools/
drwxrwxr-x 25 praz praz   4096 Agu  3 14:19 variants/
</code></pre>

<p><strong>Solved</strong></p>

<p>I think when i installed Esp8266 Boards 2.4.2 latest version is fine, i uploaded my sketch and i cannot make cache to my built core, Majenko is right, my the snippet of config are difference between my <a href="https://arduino.stackexchange.com/questions/55938/how-do-i-select-sensor-using-chip-74hc138-on-wemos-d1-mini">74hc139</a> issue and my <a href="http://paste.ubuntu.com/p/2n6GVkgM3m/" rel="nofollow noreferrer">verbose log</a> issue.</p>

<p>when i installed fresh Esp8266 Boards using boards manager, that automatically downloads source code of esp8266 core on this <a href="https://github.com/esp8266/Arduino" rel="nofollow noreferrer">Github</a>, i don't understand why my snippet of config not updated like this <a href="https://github.com/esp8266/Arduino/commit/85e68093e94b4e5c5e711888b8b5facee1bd4f9f#diff-d638a47d1ca0e2a5585fb34c7d7fb0f9L95" rel="nofollow noreferrer">commit</a>. so i updated my config of boards with copy/paste on tree links of  <a href="https://github.com/esp8266/Arduino/tree/85e68093e94b4e5c5e711888b8b5facee1bd4f9f" rel="nofollow noreferrer">Github</a>, and that's works.</p>

<p>See my verbose below or see at <a href="http://paste.ubuntu.com/p/ZwKXXCd4gg/" rel="nofollow noreferrer">this</a> :  </p>

<pre><code>/home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/tools/xtensa-lx106-elf/bin/xtensa-lx106-elf-ar cru /tmp/arduino_build_979295/core/core.a /tmp/arduino_build_979295/core/sqrt32.c.o
/home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/tools/xtensa-lx106-elf/bin/xtensa-lx106-elf-ar cru /tmp/arduino_build_979295/core/core.a /tmp/arduino_build_979295/core/time.c.o
/home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/tools/xtensa-lx106-elf/bin/xtensa-lx106-elf-ar cru /tmp/arduino_build_979295/core/core.a /tmp/arduino_build_979295/core/uart.c.o
/home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/tools/xtensa-lx106-elf/bin/xtensa-lx106-elf-ar cru /tmp/arduino_build_979295/core/core.a /tmp/arduino_build_979295/core/umm_malloc/umm_malloc.c.o
Archiving built core (caching) in: /tmp/arduino_cache_39139/core/core_8e365e854c5bfceaa27f4c371ba290d0.a
Linking everything together...
/home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/tools/xtensa-lx106-elf/bin/xtensa-lx106-elf-gcc -CC -E -P -DVTABLES_IN_FLASH /home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/tools/sdk/ld/eagle.app.v6.common.ld.h -o /tmp/arduino_build_979295/local.eagle.app.v6.common.ld
/home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/tools/xtensa-lx106-elf/bin/xtensa-lx106-elf-gcc -Wl,-Map -Wl,/tmp/arduino_build_979295/tesHC139.ino.map -g -Wall -Wextra -Os -nostdlib -Wl,--no-check-sections -u app_entry -u _printf_float -u _scanf_float -Wl,-static -L/home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/tools/sdk/lib -L/home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/tools/sdk/ld -L/home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/tools/sdk/libc/xtensa-lx106-elf/lib -Teagle.flash.4m.ld -Wl,--gc-sections -Wl,-wrap,system_restart_local -Wl,-wrap,spi_flash_read -o /tmp/arduino_build_979295/tesHC139.ino.elf -Wl,--start-group /tmp/arduino_build_979295/sketch/tesHC139.ino.cpp.o /tmp/arduino_build_979295/libraries/SPI/SPI.cpp.o /tmp/arduino_build_979295/libraries/Adafruit_BME280_Library-master/Adafruit_BME280.cpp.o /tmp/arduino_build_979295/libraries/Wire/Wire.cpp.o /tmp/arduino_build_979295/core/core.a -lhal -lphy -lpp -lnet80211 -llwip2-536-feat -lwpa -lcrypto -lmain -lwps -lbearssl -laxtls -lespnow -lsmartconfig -lairkiss -lwpa2 -lstdc++ -lm -lc -lgcc -Wl,--end-group -L/tmp/arduino_build_979295
/home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/tools/esptool/esptool -eo /home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/bootloaders/eboot/eboot.elf -bo /tmp/arduino_build_979295/tesHC139.ino.bin -bm dio -bf 40 -bz 4M -bs .text -bp 4096 -ec -eo /tmp/arduino_build_979295/tesHC139.ino.elf -bs .irom0.text -bs .text -bs .data -bs .rodata -bc -ec
Using library SPI at version 1.0 in folder: /home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/libraries/SPI 
Using library Adafruit_Sensor-master at version 1.0.2 in folder: /home/praz/Arduino/libraries/Adafruit_Sensor-master 
Using library Adafruit_BME280_Library-master at version 1.0.7 in folder: /home/praz/Arduino/libraries/Adafruit_BME280_Library-master 
Using library Wire at version 1.0 in folder: /home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/libraries/Wire 
/home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/tools/xtensa-lx106-elf/bin/xtensa-lx106-elf-size -A /tmp/arduino_build_979295/tesHC139.ino.elf
Sketch uses 265524 bytes (25%) of program storage space. Maximum is 1044464 bytes.
Global variables use 28236 bytes (34%) of dynamic memory, leaving 53684 bytes for local variables. Maximum is 81920 bytes.
/home/praz/.arduino15/packages/esp8266/hardware/esp8266/2.4.2/tools/esptool/esptool -vv -cd nodemcu -cb 115200 -cp /dev/ttyUSB0 -ca 0x00000 -cf /tmp/arduino_build_979295/tesHC139.ino.bin 
</code></pre>

<p>Hope anyone can solve my issue, Thanks in advance.</p>
 4143: <p>This was fixed on the 20th August in <a href="https://github.com/esp8266/Arduino/commit/85e68093e94b4e5c5e711888b8b5facee1bd4f9f#diff-d638a47d1ca0e2a5585fb34c7d7fb0f9L95" rel="nofollow noreferrer">this commit</a>. Make sure you have the latest version of the ESP8266 core installed. If there hasn't been a release since that fix, you can pull the github version of the config file and use that instead of the one bundled with the core.</p>

<p>However, it's not a fatal error - it merely means that compilation will be slower than it should be.</p>
