Localize hostname symbol

[andig]

When I declare

String hostname;

I end up with a compiler conflict:

C:\Users\xx\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.0.0-rc2/tools/sdk/lib\libmain.a(eagle_lwip_if.o):(.bss+0x0): multiple definition of `hostname'

sketch\esp8266-webconf.ino.cpp.o:(.bss.hostname+0x0): first defined here

c:/users/xx/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/bin/ld.exe: Warning: size of symbol `hostname' changed from 12 in sketch\esp8266-webconf.ino.cpp.o to 4 in C:\Users\xx\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.0.0-rc2/tools/sdk/lib\libmain.a(eagle_lwip_if.o)

collect2.exe: error: ld returned 1 exit status

exit status 1
Error compiling.

However, when I try to use the obviously existing internal hostname I receive an undefined error.

Is hostname a forbidden symbol name?

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[igrr]

hostname is a symbol exported from one of SDK libraries. When you declare
another symbol with the same name, you get linker error. If you try to use
the existing one you get compiler error, because hostname isn't declared
anywhere.

For now, you should avoid using this name.
I'll check if it can be localized to one of the libraries.

On Tue, Dec 22, 2015, 19:04 andig notifications@github.com wrote:

When I declare

String hostname;

I end up with a compiler conflict:

C:\Users\xx\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.0.0-rc2/tools/sdk/lib\libmain.a(eagle_lwip_if.o):(.bss+0x0): multiple definition of `hostname'

sketch\esp8266-webconf.ino.cpp.o:(.bss.hostname+0x0): first defined here

c:/users/xx/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/bin/ld.exe: Warning: size of symbol `hostname' changed from 12 in sketch\esp8266-webconf.ino.cpp.o to 4 in C:\Users\xx\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.0.0-rc2/tools/sdk/lib\libmain.a(eagle_lwip_if.o)

collect2.exe: error: ld returned 1 exit status

exit status 1
Error compiling.

However, when I try to use the obviously existing internal hostname I
receive an undefined error.

Is hostname a forbidden symbol name?

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#1281.

[devyte]

@d-a-v does #3362 fix this? I can't find the symbol in lwip2.