Unable to compile

[Jimbobnz]

`Arduino: 1.8.4 (Windows 10), Board: "NodeMCU 1.0 (ESP-12E Module), 80 MHz, 115200, 4M (3M SPIFFS)"

Build options changed, rebuilding all
C:\Users\James\Documents\Arduino\libraries\uMQTTBroker\src\mqtt_server.c: In function 'MQTT_server_deleteClientCon':

C:\Users\James\Documents\Arduino\libraries\uMQTTBroker\src\mqtt_server.c:156:2: warning: 'return' with no value, in function returning non-void [enabled by default]

return;

^

In file included from C:\Users\James\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.0-rc2/tools/sdk/include/os_type.h:28:0,

             from C:\Users\James\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.0-rc2/tools/sdk/include/user_interface.h:28,

             from C:\Users\James\Documents\Arduino\libraries\uMQTTBroker\src\uMQTTBroker.h:4,

             from C:\Users\James\Documents\Arduino\libraries\uMQTTBroker\src\uMQTTBroker.cpp:2:

C:\Users\James\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.0-rc2/tools/sdk/include/ets_sys.h:193:5: error: previous declaration of 'int atoi(const char*)' with 'C++' linkage

int atoi(const char *nptr);

 ^

In file included from C:\Users\James\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.0-rc2/tools/sdk/libc/xtensa-lx106-elf/include/string.h:10:0,

             from C:\Users\James\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.0-rc2/tools/sdk/include/osapi.h:28,

             from C:\Users\James\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.0-rc2/tools/sdk/lwip/include/arch/cc.h:40,

             from C:\Users\James\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.0-rc2/tools/sdk/lwip/include/lwip/arch.h:43,

             from C:\Users\James\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.0-rc2/tools/sdk/lwip/include/lwip/debug.h:35,

             from C:\Users\James\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.0-rc2/tools/sdk/lwip/include/lwip/opt.h:46,

             from C:\Users\James\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.0-rc2/tools/sdk/lwip/include/lwip/ip_addr.h:35,

             from C:\Users\James\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.0-rc2/tools/sdk/include/user_interface.h:30,

             from C:\Users\James\Documents\Arduino\libraries\uMQTTBroker\src\uMQTTBroker.h:4,

             from C:\Users\James\Documents\Arduino\libraries\uMQTTBroker\src\uMQTTBroker.cpp:2:

C:\Users\James\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.0-rc2/tools/sdk/libc/xtensa-lx106-elf/include/stdlib.h:78:36: error: conflicts with new declaration with 'C' linkage

int _EXFUN(atoi,(const char *__nptr));

                                ^

C:\Users\James\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.0-rc2/tools/sdk/libc/xtensa-lx106-elf/include/_ansi.h:65:35: note: in definition of macro '_EXFUN'

#define _EXFUN(name, proto) name proto

                               ^

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

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

[martin-ger]

Used Arduino 1.8.5 with ESP Board Vesion 2.4.2. For me it compiles without errors. The first warning is now fixed with the latest version.