How to avoid multiple definitions from static libraries

shb3014 · December 23, 2020, 6:30am

I’m trying to build an esp32 project which links a static library I do not own. The lib has definition of cJSON functions which seems to be in conflict with libjson from the framework tools.
This is my platfomio.ini file:

[env:az-delivery-devkit-v4]
platform = espressif32
board = az-delivery-devkit-v4
framework = arduino

platform_packages =
    toolchain-xtensa32 @ ~2.80200.0
    framework-arduinoespressif32 @  https://hub.fastgit.org/espressif/arduino-esp32.git#idf-release/v4.2

lib_deps =
    joylink
    pal
    TFT_espi
    SPI
    MD_AD9833


monitor_speed = 115200
monitor_filters = esp32_exception_decoder

build_flags =
    -I ./example
    -I ./lib/joylink/inc
    -I ./lib/pal/inc
    -L ./lib/joylink/lib
    -l libjoylink
    -DuECC_PLATFORM=uECC_arch_other -mlongcalls -Wshadow -Wpointer-arith -Waggregate-return -Winline -Wunreachable-code -D __LINUX_PAL__
    -Wl,-Map,output.map
    -DCORE_DEBUG_LEVEL=5

These are the error outputs:

Linking .pio\build\az-delivery-devkit-v4\firmware.elf
c:/users/gordon/.platformio/packages/toolchain-xtensa32/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\Gordon\.platformio\packages\framework-arduinoespressif32@src-af5e7a20b06459e6156a1629ec8e660c\tools\sdk\esp32\lib\libjson.a(cJSON.c.obj): in function `cJSON_GetErrorPtr':
/Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/json/cJSON/cJSON.c:78: multiple definition of `cJSON_GetErrorPtr'; lib\joylink\lib\libjoylink.a(cJSON.o):cJSON.c:(.text+0x0): first defined here
c:/users/gordon/.platformio/packages/toolchain-xtensa32/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\Gordon\.platformio\packages\framework-arduinoespressif32@src-af5e7a20b06459e6156a1629ec8e660c\tools\sdk\esp32\lib\libjson.a(cJSON.c.obj): in function `cJSON_InitHooks':
/Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/json/cJSON/cJSON.c:181: multiple definition of `cJSON_InitHooks'; lib\joylink\lib\libjoylink.a(cJSON.o):cJSON.c:(.text+0x144): first defined here
c:/users/gordon/.platformio/packages/toolchain-xtensa32/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\Gordon\.platformio\packages\framework-arduinoespressif32@src-af5e7a20b06459e6156a1629ec8e660c\tools\sdk\esp32\lib\libjson.a(cJSON.c.obj): in function `cJSON_Delete':
/Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/json/cJSON/cJSON.c:225: multiple definition of `cJSON_Delete'; lib\joylink\lib\libjoylink.a(cJSON.o):cJSON.c:(.text+0x1b8): first defined here
c:/users/gordon/.platformio/packages/toolchain-xtensa32/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\Gordon\.platformio\packages\framework-arduinoespressif32@src-af5e7a20b06459e6156a1629ec8e660c\tools\sdk\esp32\lib\libjson.a(cJSON.c.obj): in function `cJSON_ParseWithOpts':
/Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/json/cJSON/cJSON.c:1011: multiple definition of `cJSON_ParseWithOpts'; lib\joylink\lib\libjoylink.a(cJSON.o):cJSON.c:(.text+0x1070): first defined here
c:/users/gordon/.platformio/packages/toolchain-xtensa32/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\Gordon\.platformio\packages\framework-arduinoespressif32@src-af5e7a20b06459e6156a1629ec8e660c\tools\sdk\esp32\lib\libjson.a(cJSON.c.obj): in function `cJSON_Parse':
/Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/json/cJSON/cJSON.c:1091: multiple definition of `cJSON_Parse'; lib\joylink\lib\libjoylink.a(cJSON.o):cJSON.c:(.text+0x10ec): first defined here
c:/users/gordon/.platformio/packages/toolchain-xtensa32/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\Gordon\.platformio\packages\framework-arduinoespressif32@src-af5e7a20b06459e6156a1629ec8e660c\tools\sdk\esp32\lib\libjson.a(cJSON.c.obj): in function `cJSON_Print':
/Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/json/cJSON/cJSON.c:1163: multiple definition of `cJSON_Print'; lib\joylink\lib\libjoylink.a(cJSON.o):cJSON.c:(.text+0x1104): first defined here
c:/users/gordon/.platformio/packages/toolchain-xtensa32/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\Gordon\.platformio\packages\framework-arduinoespressif32@src-af5e7a20b06459e6156a1629ec8e660c\tools\sdk\esp32\lib\libjson.a(cJSON.c.obj): in function `cJSON_PrintUnformatted':
/Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/json/cJSON/cJSON.c:1168: multiple definition of `cJSON_PrintUnformatted'; lib\joylink\lib\libjoylink.a(cJSON.o):cJSON.c:(.text+0x111c): first defined here
c:/users/gordon/.platformio/packages/toolchain-xtensa32/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\Gordon\.platformio\packages\framework-arduinoespressif32@src-af5e7a20b06459e6156a1629ec8e660c\tools\sdk\esp32\lib\libjson.a(cJSON.c.obj): in function `cJSON_PrintBuffered':
/Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/json/cJSON/cJSON.c:1173: multiple definition of `cJSON_PrintBuffered'; lib\joylink\lib\libjoylink.a(cJSON.o):cJSON.c:(.text+0x1134): first defined here
c:/users/gordon/.platformio/packages/toolchain-xtensa32/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\Gordon\.platformio\packages\framework-arduinoespressif32@src-af5e7a20b06459e6156a1629ec8e660c\tools\sdk\esp32\lib\libjson.a(cJSON.c.obj): in function `cJSON_GetArraySize':
/Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/json/cJSON/cJSON.c:1731: multiple definition of `cJSON_GetArraySize'; lib\joylink\lib\libjoylink.a(cJSON.o):cJSON.c:(.text+0x1fe4): first defined here
c:/users/gordon/.platformio/packages/toolchain-xtensa32/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\Gordon\.platformio\packages\framework-arduinoespressif32@src-af5e7a20b06459e6156a1629ec8e660c\tools\sdk\esp32\lib\libjson.a(cJSON.c.obj): in function `cJSON_GetArrayItem':
/Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/json/cJSON/cJSON.c:1773: multiple definition of `cJSON_GetArrayItem'; lib\joylink\lib\libjoylink.a(cJSON.o):cJSON.c:(.text+0x2010): first defined here
c:/users/gordon/.platformio/packages/toolchain-xtensa32/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\Gordon\.platformio\packages\framework-arduinoespressif32@src-af5e7a20b06459e6156a1629ec8e660c\tools\sdk\esp32\lib\libjson.a(cJSON.c.obj): in function `cJSON_GetObjectItem':
/Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/json/cJSON/cJSON.c:1815: multiple definition of `cJSON_GetObjectItem'; lib\joylink\lib\libjoylink.a(cJSON.o):cJSON.c:(.text+0x203c): first defined here
c:/users/gordon/.platformio/packages/toolchain-xtensa32/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\Gordon\.platformio\packages\framework-arduinoespressif32@src-af5e7a20b06459e6156a1629ec8e660c\tools\sdk\esp32\lib\libjson.a(cJSON.c.obj): in function `cJSON_AddItemToArray':
/Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/json/cJSON/cJSON.c:1889: multiple definition of `cJSON_AddItemToArray'; lib\joylink\lib\libjoylink.a(cJSON.o):cJSON.c:(.text+0x20d4): first defined here
c:/users/gordon/.platformio/packages/toolchain-xtensa32/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\Gordon\.platformio\packages\framework-arduinoespressif32@src-af5e7a20b06459e6156a1629ec8e660c\tools\sdk\esp32\lib\libjson.a(cJSON.c.obj): in function `cJSON_AddItemToObject':
/Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/json/cJSON/cJSON.c:1947: multiple definition of `cJSON_AddItemToObject'; lib\joylink\lib\libjoylink.a(cJSON.o):cJSON.c:(.text+0x2114): first defined here
c:/users/gordon/.platformio/packages/toolchain-xtensa32/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\Gordon\.platformio\packages\framework-arduinoespressif32@src-af5e7a20b06459e6156a1629ec8e660c\tools\sdk\esp32\lib\libjson.a(cJSON.c.obj): in function `cJSON_AddItemToObjectCS':
/Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/json/cJSON/cJSON.c:1953: multiple definition of `cJSON_AddItemToObjectCS'; lib\joylink\lib\libjoylink.a(cJSON.o):cJSON.c:(.text+0x2154): first defined here
c:/users/gordon/.platformio/packages/toolchain-xtensa32/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\Gordon\.platformio\packages\framework-arduinoespressif32@src-af5e7a20b06459e6156a1629ec8e660c\tools\sdk\esp32\lib\libjson.a(cJSON.c.obj): in function `cJSON_AddItemReferenceToArray':
/Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/json/cJSON/cJSON.c:1958: multiple definition of `cJSON_AddItemReferenceToArray'; lib\joylink\lib\libjoylink.a(cJSON.o):cJSON.c:(.text+0x21ac): first defined here
c:/users/gordon/.platformio/packages/toolchain-xtensa32/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\Gordon\.platformio\packages\framework-arduinoespressif32@src-af5e7a20b06459e6156a1629ec8e660c\tools\sdk\esp32\lib\libjson.a(cJSON.c.obj): in function `cJSON_AddItemReferenceToObject':
/Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/json/cJSON/cJSON.c:1968: multiple definition of `cJSON_AddItemReferenceToObject'; lib\joylink\lib\libjoylink.a(cJSON.o):cJSON.c:(.text+0x21cc): first defined here
c:/users/gordon/.platformio/packages/toolchain-xtensa32/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\Gordon\.platformio\packages\framework-arduinoespressif32@src-af5e7a20b06459e6156a1629ec8e660c\tools\sdk\esp32\lib\libjson.a(cJSON.c.obj): in function `cJSON_DetachItemFromArray':
/Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/json/cJSON/cJSON.c:2116: multiple definition of `cJSON_DetachItemFromArray'; lib\joylink\lib\libjoylink.a(cJSON.o):cJSON.c:(.text+0x21f0): first defined here
c:/users/gordon/.platformio/packages/toolchain-xtensa32/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\Gordon\.platformio\packages\framework-arduinoespressif32@src-af5e7a20b06459e6156a1629ec8e660c\tools\sdk\esp32\lib\libjson.a(cJSON.c.obj): in function `cJSON_DeleteItemFromArray':
/Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/json/cJSON/cJSON.c:2126: multiple definition of `cJSON_DeleteItemFromArray'; lib\joylink\lib\libjoylink.a(cJSON.o):cJSON.c:(.text+0x2264): first defined here
c:/users/gordon/.platformio/packages/toolchain-xtensa32/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\Gordon\.platformio\packages\framework-arduinoespressif32@src-af5e7a20b06459e6156a1629ec8e660c\tools\sdk\esp32\lib\libjson.a(cJSON.c.obj): in function `cJSON_DetachItemFromObject':
/Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/json/cJSON/cJSON.c:2131: multiple definition of `cJSON_DetachItemFromObject'; lib\joylink\lib\libjoylink.a(cJSON.o):cJSON.c:(.text+0x2288): first defined here
c:/users/gordon/.platformio/packages/toolchain-xtensa32/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\Gordon\.platformio\packages\framework-arduinoespressif32@src-af5e7a20b06459e6156a1629ec8e660c\tools\sdk\esp32\lib\libjson.a(cJSON.c.obj): in function `cJSON_DeleteItemFromObject':
/Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/json/cJSON/cJSON.c:2145: multiple definition of `cJSON_DeleteItemFromObject'; lib\joylink\lib\libjoylink.a(cJSON.o):cJSON.c:(.text+0x22d8): first defined here
c:/users/gordon/.platformio/packages/toolchain-xtensa32/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\Gordon\.platformio\packages\framework-arduinoespressif32@src-af5e7a20b06459e6156a1629ec8e660c\tools\sdk\esp32\lib\libjson.a(cJSON.c.obj): in function `cJSON_InsertItemInArray':
/Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/json/cJSON/cJSON.c:2156: multiple definition of `cJSON_InsertItemInArray'; lib\joylink\lib\libjoylink.a(cJSON.o):cJSON.c:(.text+0x22fc): first defined here
c:/users/gordon/.platformio/packages/toolchain-xtensa32/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\Gordon\.platformio\packages\framework-arduinoespressif32@src-af5e7a20b06459e6156a1629ec8e660c\tools\sdk\esp32\lib\libjson.a(cJSON.c.obj): in function `cJSON_ReplaceItemInArray':
/Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/json/cJSON/cJSON.c:2220: multiple definition of `cJSON_ReplaceItemInArray'; lib\joylink\lib\libjoylink.a(cJSON.o):cJSON.c:(.text+0x2368): first defined here
c:/users/gordon/.platformio/packages/toolchain-xtensa32/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\Gordon\.platformio\packages\framework-arduinoespressif32@src-af5e7a20b06459e6156a1629ec8e660c\tools\sdk\esp32\lib\libjson.a(cJSON.c.obj): in function `cJSON_ReplaceItemInObject':
/Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/json/cJSON/cJSON.c:2250: multiple definition of `cJSON_ReplaceItemInObject'; lib\joylink\lib\libjoylink.a(cJSON.o):cJSON.c:(.text+0x23ec): first defined here
c:/users/gordon/.platformio/packages/toolchain-xtensa32/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\Gordon\.platformio\packages\framework-arduinoespressif32@src-af5e7a20b06459e6156a1629ec8e660c\tools\sdk\esp32\lib\libjson.a(cJSON.c.obj): in function `cJSON_CreateNull':
/Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/json/cJSON/cJSON.c:2261: multiple definition of `cJSON_CreateNull'; lib\joylink\lib\libjoylink.a(cJSON.o):cJSON.c:(.text+0x2444): first defined here
c:/users/gordon/.platformio/packages/toolchain-xtensa32/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\Gordon\.platformio\packages\framework-arduinoespressif32@src-af5e7a20b06459e6156a1629ec8e660c\tools\sdk\esp32\lib\libjson.a(cJSON.c.obj): in function `cJSON_CreateTrue':
/Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/json/cJSON/cJSON.c:2272: multiple definition of `cJSON_CreateTrue'; lib\joylink\lib\libjoylink.a(cJSON.o):cJSON.c:(.text+0x245c): first defined here
c:/users/gordon/.platformio/packages/toolchain-xtensa32/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\Gordon\.platformio\packages\framework-arduinoespressif32@src-af5e7a20b06459e6156a1629ec8e660c\tools\sdk\esp32\lib\libjson.a(cJSON.c.obj): in function `cJSON_CreateFalse':
/Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/json/cJSON/cJSON.c:2283: multiple definition of `cJSON_CreateFalse'; lib\joylink\lib\libjoylink.a(cJSON.o):cJSON.c:(.text+0x2474): first defined here
c:/users/gordon/.platformio/packages/toolchain-xtensa32/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\Gordon\.platformio\packages\framework-arduinoespressif32@src-af5e7a20b06459e6156a1629ec8e660c\tools\sdk\esp32\lib\libjson.a(cJSON.c.obj): in function `cJSON_CreateBool':
/Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/json/cJSON/cJSON.c:2294: multiple definition of `cJSON_CreateBool'; lib\joylink\lib\libjoylink.a(cJSON.o):cJSON.c:(.text+0x248c): first defined here
c:/users/gordon/.platformio/packages/toolchain-xtensa32/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\Gordon\.platformio\packages\framework-arduinoespressif32@src-af5e7a20b06459e6156a1629ec8e660c\tools\sdk\esp32\lib\libjson.a(cJSON.c.obj): in function `cJSON_CreateNumber':
/Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/json/cJSON/cJSON.c:2305: multiple definition of `cJSON_CreateNumber'; lib\joylink\lib\libjoylink.a(cJSON.o):cJSON.c:(.text+0x24b4): first defined here
c:/users/gordon/.platformio/packages/toolchain-xtensa32/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\Gordon\.platformio\packages\framework-arduinoespressif32@src-af5e7a20b06459e6156a1629ec8e660c\tools\sdk\esp32\lib\libjson.a(cJSON.c.obj): in function `cJSON_CreateString':
/Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/json/cJSON/cJSON.c:2331: multiple definition of `cJSON_CreateString'; lib\joylink\lib\libjoylink.a(cJSON.o):cJSON.c:(.text+0x24ec): first defined here
c:/users/gordon/.platformio/packages/toolchain-xtensa32/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\Gordon\.platformio\packages\framework-arduinoespressif32@src-af5e7a20b06459e6156a1629ec8e660c\tools\sdk\esp32\lib\libjson.a(cJSON.c.obj): in function `cJSON_CreateArray':
/Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/json/cJSON/cJSON.c:2398: multiple definition of `cJSON_CreateArray'; lib\joylink\lib\libjoylink.a(cJSON.o):cJSON.c:(.text+0x2514): first defined here
c:/users/gordon/.platformio/packages/toolchain-xtensa32/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\Gordon\.platformio\packages\framework-arduinoespressif32@src-af5e7a20b06459e6156a1629ec8e660c\tools\sdk\esp32\lib\libjson.a(cJSON.c.obj): in function `cJSON_CreateObject':
/Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/json/cJSON/cJSON.c:2409: multiple definition of `cJSON_CreateObject'; lib\joylink\lib\libjoylink.a(cJSON.o):cJSON.c:(.text+0x252c): first defined here
c:/users/gordon/.platformio/packages/toolchain-xtensa32/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\Gordon\.platformio\packages\framework-arduinoespressif32@src-af5e7a20b06459e6156a1629ec8e660c\tools\sdk\esp32\lib\libjson.a(cJSON.c.obj): in function `cJSON_CreateIntArray':
/Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/json/cJSON/cJSON.c:2421: multiple definition of `cJSON_CreateIntArray'; lib\joylink\lib\libjoylink.a(cJSON.o):cJSON.c:(.text+0x2544): first defined here
c:/users/gordon/.platformio/packages/toolchain-xtensa32/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\Gordon\.platformio\packages\framework-arduinoespressif32@src-af5e7a20b06459e6156a1629ec8e660c\tools\sdk\esp32\lib\libjson.a(cJSON.c.obj): in function `cJSON_CreateFloatArray':
/Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/json/cJSON/cJSON.c:2456: multiple definition of `cJSON_CreateFloatArray'; lib\joylink\lib\libjoylink.a(cJSON.o):cJSON.c:(.text+0x25b8): first defined here
c:/users/gordon/.platformio/packages/toolchain-xtensa32/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\Gordon\.platformio\packages\framework-arduinoespressif32@src-af5e7a20b06459e6156a1629ec8e660c\tools\sdk\esp32\lib\libjson.a(cJSON.c.obj): in function `cJSON_CreateDoubleArray':
/Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/json/cJSON/cJSON.c:2492: multiple definition of `cJSON_CreateDoubleArray'; lib\joylink\lib\libjoylink.a(cJSON.o):cJSON.c:(.text+0x2630): first defined here
c:/users/gordon/.platformio/packages/toolchain-xtensa32/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\Gordon\.platformio\packages\framework-arduinoespressif32@src-af5e7a20b06459e6156a1629ec8e660c\tools\sdk\esp32\lib\libjson.a(cJSON.c.obj): in function `cJSON_CreateStringArray':
/Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/json/cJSON/cJSON.c:2528: multiple definition of `cJSON_CreateStringArray'; lib\joylink\lib\libjoylink.a(cJSON.o):cJSON.c:(.text+0x269c): first defined here
c:/users/gordon/.platformio/packages/toolchain-xtensa32/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\Gordon\.platformio\packages\framework-arduinoespressif32@src-af5e7a20b06459e6156a1629ec8e660c\tools\sdk\esp32\lib\libjson.a(cJSON.c.obj): in function `cJSON_Duplicate':
/Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/json/cJSON/cJSON.c:2565: multiple definition of `cJSON_Duplicate'; lib\joylink\lib\libjoylink.a(cJSON.o):cJSON.c:(.text+0x2704): first defined here
c:/users/gordon/.platformio/packages/toolchain-xtensa32/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\Gordon\.platformio\packages\framework-arduinoespressif32@src-af5e7a20b06459e6156a1629ec8e660c\tools\sdk\esp32\lib\libjson.a(cJSON.c.obj): in function `cJSON_Minify':
/Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/json/cJSON/cJSON.c:2693: multiple definition of `cJSON_Minify'; lib\joylink\lib\libjoylink.a(cJSON.o):cJSON.c:(.text+0x27fc): first defined here
collect2.exe: error: ld returned 1 exit status
*** [.pio\build\az-delivery-devkit-v4\firmware.elf] Error 1
========================= [FAILED] Took 53.55 seconds =========================
CMakeFiles\Production.dir\build.make:76: recipe for target 'CMakeFiles/Production' failed
CMakeFiles\Makefile2:98: recipe for target 'CMakeFiles/Production.dir/all' failed
CMakeFiles\Makefile2:105: recipe for target 'CMakeFiles/Production.dir/rule' failed
Makefile:137: recipe for target 'Production' failed
mingw32-make.exe[3]: *** [CMakeFiles/Production] Error 1
mingw32-make.exe[2]: *** [CMakeFiles/Production.dir/all] Error 2
mingw32-make.exe[1]: *** [CMakeFiles/Production.dir/rule] Error 2
mingw32-make.exe: *** [Production] Error 2

In idf4.2 the linker throws multiple definition error (not if I use 4.0).
What I have tried so far

Move project cJSON.h into a folder named cJSON under ./lib
Add cJSON to lib-ignore
Add path to libjson to lib-ignore
Delete the include_directories line targeting cJSON

None of the above works.
My question is how to resolve such conflicts under platformio. Any help will be much appreciated.

maxgerhardt · December 23, 2020, 11:52am

/Users/ficeto/Desktop/ESP32/ESP32S2/esp-idf-public/components/json/cJSON/cJSON.c:181: multiple definition of cJSON_InitHooks'; lib\joylink\lib\libjoylink.a(cJSON.o):cJSON.c:(.text+0x144): first defined here c:/users/gordon/.platformio/packages/toolchain-xtensa32/bin/../lib/gcc/xtensa-esp32-elf/8.2.0/../../../../xtensa-esp32-elf/bin/ld.exe: C:\Users\Gordon\.platformio\packages\framework-arduinoespressif32@src-af5e7a20b06459e6156a1629ec8e660c\tools\sdk\esp32\lib\libjson.a(cJSON.c.obj): in function cJSON_Delete’:

This libjoylink.a library you’re using contains the cJSON library as well. Since that is hardcompiled in the only resolution I see would be to not link the Arduino’s \tools\sdk\esp32\lib\libjson.a file.

Including this library is done in the original build script at the end this code using -ljson

github.com

espressif/arduino-esp32/blob/ef99cd7fe7778719c92d6f8df0f10d3f0f7aa35e/tools/platformio-build.py#L173-L175


      
          LIBS=[
              "-lgcc", "-lespcoredump", "-lesp_event", "-lheap", "-lpe", "-lmesh", "-lm", "-lesp_http_client", "-lfb_gfx", "-lface_detection", "-lesp_adc_cal", "-ldetection_cat_face", "-lmbedtls", "-lunity", "-lspiffs", "-lod", "-lapp_trace", "-llog", "-lesp_websocket_client", "-lexpat", "-lwpa2", "-lxtensa-debug-module", "-lnet80211", "-lhal", "-lvfs", "-lwps", "-lmqtt", "-lasio", "-lbt", "-lwpa_supplicant", "-lpp", "-lmdns", "-llwip", "-lnvs_flash", "-lc", "-lbootloader_support", "-lnewlib", "-lsdmmc", "-lapp_update", "-lethernet", "-lefuse", "-lprotobuf-c", "-ldetection", "-lfreemodbus", "-lcore", "-lface_recognition", "-lfd", "-lcoap", "-ljsmn", "-lesp_https_ota", "-ltcp_transport", "-lbtdm_app", "-lesp_ringbuf", "-ldriver", "-lwifi_provisioning", "-llibsodium", "-lopenssl", "-lfatfs", "-lnghttp", "-lespnow", "-lprotocomm", "-lspi_flash", "-lc_nano", "-lulp", "-lesp_http_server", "-lesp32-camera", "-lsmartconfig", "-lsmartconfig_ack", "-lesp-tls", "-lcoexist", "-lmicro-ecc", "-lesp_https_server", "-lwpa", "-ltcpip_adapter", "-lwear_levelling", "-lfreertos", "-lsoc", "-ljson", "-lesp32", "-lpthread", "-lcxx", "-lfr", "-ldl", "-lphy", "-limage_util", "-lrtc", "-lconsole", "-lstdc++"
          ],

Using Advanced Scripting, we can come up with something that removes that flag.

Add to the platformio.ini

extra_scripts = remove_lib.py

and then in the project folder, at the same level as the platformio.ini, the file remove_lib.py with the content

Import("env")

libs = env["LIBS"]
#print("libs before:" + str(libs))
libs.remove("-ljson")
#print("libs after:" + str(libs))
env.Replace(
  LIBS=libs
)

and in my tests that removes -ljson.

Of course the other thing that would be super nice is if you had the Joylink available to you as sourcecode and then you would just remove the duplicate cJSON sources. Or if that library was compiled as dynamica library with libjson.so being a dependency of it – that way both the arduino core and the joylink library could use the same code.

maxgerhardt · December 23, 2020, 12:15pm

Oh actually I had another thought. .a library files are nothing but archives containing object files…

You can trivially fix the joylink library by removing all cJSON related object files using ar commands as shown in libraries - Deleting a file object from a library - Unix & Linux Stack Exchange. (Or, for xtensa32, better use the C:\Users\<user>\.platformio\packages\toolchain-xtensa32\bin\xtensa-esp32-elf-ar.exe program).

shb3014 · December 23, 2020, 2:42pm

You can trivially fix the joylink library by removing all cJSON related object files using ar commands as shown in libraries - Deleting a file object from a library - Unix & Linux Stack Exchange. (Or, for xtensa32, better use the C:\Users\<user>\.platformio\packages\toolchain-xtensa32\bin\xtensa-esp32-elf-ar.exe program).

That works like a charm. As soon as I removed the cJSON.o from the lib, it all compiles. Thank you so much for the quick reply!