Building examples/qrcode for esp32

[lll000111]

Build platform: Linux

esp-idf installed in ~/esp (and a symlink ~/esp32 => ~/esp because when I installed to ~/esp as instructed by esp-idf installation instructions it could not find it, and when I moved it to ~/esp32 it turned out that during different build steps both paths ~/esp as well as ~/esp32 were used)

Only copying the last lines of output:

App "xs_esp32" version: dc94381c
Building component project variables list /home/mha/Projects/moddable/build/tmp/esp32/debug/idf/app_update/component_project_vars.mk
including /home/mha/esp32/esp-idf/components/app_update/Makefile.projbuild...
including /home/mha/esp32/esp-idf/components/bootloader/Makefile.projbuild...
including /home/mha/esp32/esp-idf/components/bootloader_support/Makefile.projbuild...
including /home/mha/esp32/esp-idf/components/coap/Makefile.projbuild...
including /home/mha/esp32/esp-idf/components/esp32/Makefile.projbuild...
including /home/mha/esp32/esp-idf/components/esptool_py/Makefile.projbuild...
including /home/mha/esp32/esp-idf/components/mbedtls/Makefile.projbuild...
including /home/mha/esp32/esp-idf/components/nghttp/Makefile.projbuild...
including /home/mha/esp32/esp-idf/components/partition_table/Makefile.projbuild...
including /home/mha/esp32/esp-idf/components/ulp/Makefile.projbuild...
including /home/mha/esp32/esp-idf/components/unity/Makefile.projbuild...
# cc xsHost.c (strings in flash)
In file included from /home/mha/Projects/moddable/xs/sources/xsCommon.h:41:0,
                 from /home/mha/Projects/moddable/xs/sources/xsAll.h:41,
                 from /home/mha/Projects/moddable/xs/platforms/esp/xsHost.c:38:
/home/mha/Projects/moddable/xs/platforms/esp/xsPlatform.h:102:24: fatal error: lwip/netdb.h: No such file or directory
compilation terminated.
/home/mha/Projects/moddable/build/tmp/esp32/debug/qrcode/makefile:444: recipe for target '/home/mha/Projects/moddable/build/tmp/esp32/debug/lib/xsHost.c.o' failed
make: *** [/home/mha/Projects/moddable/build/tmp/esp32/debug/lib/xsHost.c.o] Error 1

There indeed is no file lwip/netdb.h. There would be one available as part of esp-idf though: ~/esp32/esp-idf/components/lwip/lwip/src/include/lwip/netdb.h but that's not the location that gets used. There is no such file in ..../build/tmp/esp32/debug/idf/include/config/lwip/

[barbiani]

I saw the same when using the wrong version of idf.

[lll000111]

What is the "wrong version"? I have 64 bit Linux and xtensa-esp32-elf-linux64-1.22.0-80-g6c4433a-5.2.0.tar.gz and I cloned git@github.com:espressif/esp-idf.git

[barbiani]

It would be 3.1.

git checkout release/v3.1
git submodule update

[lll000111]

Okay, I could build it now.

[phoddie]

@barbiani, thank you!