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I'm having difficulties to compile c++ code with xtensa-lx106-elf.

The manufacture of the chip I'm using (esp8266) provides a sdk (nonos-sdk). One of the libraries in this sdk implements functions to allocate memory in the chip: os_malloc, os_realloc, etc.

When compiling c code, everything works fine. When compiling c++, object files are generated successfully but I get a lot of error messages from the linker, complaining about undefined references to abort, free, malloc and a very odd one to __gxx_personality_v0.

My make file was created using cmake. Bellow the options that I use with the compiler.

target_include_directories( 
  ${elf_file}

  PUBLIC
  src/
  inc/
  /opt/esp-open-sdk/sdk/driver_lib/include/
  /opt/esp-open-sdk/sdk/include/
  )

target_compile_options(
  ${elf_file}

  PUBLIC
  -mlongcalls -c -std=c++11 -v
  )

target_link_libraries( 
  ${elf_file}

  PUBLIC

  -L/opt/esp-open-sdk/sdk/lib
  -L/opt/esp-open-sdk/sdk/ld
  -Teagle.app.v6.ld

  -nostdlib

  -Wl,--start-group
    -lmain -lhal -lnet80211 -lcrypto -lupgrade -lwpa -llwip -lpp -lphy -v
  -Wl,--end-group

  -ldriver
  -lcirom
  -lgcc
  )

Compiler errors:

CMakeFiles/MasterSPI-esp8266.elf.dir/src/main.cpp.o:(.eh_frame+0x12): undefined reference to `__gxx_personality_v0'
CMakeFiles/MasterSPI-esp8266.elf.dir/src/spi.cpp.o:(.eh_frame+0x12): undefined reference to `__gxx_personality_v0'
/opt/esp-open-sdk/sdk/lib/libgcc.a(unwind-dw2.o):(.literal+0x8): undefined reference to `abort'
/opt/esp-open-sdk/sdk/lib/libgcc.a(unwind-dw2.o): In function `execute_cfa_program':
/home/wjg/Repo/esp-open-sdk-20170622/crosstool-NG/.build/src/gcc-4.8.5/libgcc/unwind-dw2.c:1212: undefined reference to `abort'
/opt/esp-open-sdk/sdk/lib/libgcc.a(unwind-dw2.o): In function `read_encoded_value_with_base':
/home/wjg/Repo/esp-open-sdk-20170622/crosstool-NG/.build/src/gcc-4.8.5/libgcc/unwind-pe.h:252: undefined reference to `abort'
/opt/esp-open-sdk/sdk/lib/libgcc.a(unwind-dw2.o): In function `execute_stack_op':
/home/wjg/Repo/esp-open-sdk-20170622/crosstool-NG/.build/src/gcc-4.8.5/libgcc/unwind-dw2.c:905: undefined reference to `abort'
/opt/esp-open-sdk/sdk/lib/libgcc.a(unwind-dw2.o): In function `uw_update_context_1':
/home/wjg/Repo/esp-open-sdk-20170622/crosstool-NG/.build/src/gcc-4.8.5/libgcc/unwind-dw2.c:1420: undefined reference to `abort'
/opt/esp-open-sdk/sdk/lib/libgcc.a(unwind-dw2.o):/home/wjg/Repo/esp-open-sdk-20170622/crosstool-NG/.build/src/gcc-4.8.5/libgcc/unwind-dw2.c:1560: more undefined references to `abort' follow
/opt/esp-open-sdk/sdk/lib/libgcc.a(unwind-dw2-fde.o):(.literal+0x20): undefined reference to `malloc'
/opt/esp-open-sdk/sdk/lib/libgcc.a(unwind-dw2-fde.o):(.literal+0x24): undefined reference to `free'
/opt/esp-open-sdk/sdk/lib/libgcc.a(unwind-dw2-fde.o): In function `size_of_encoded_value':
/home/wjg/Repo/esp-open-sdk-20170622/crosstool-NG/.build/src/gcc-4.8.5/libgcc/unwind-pe.h:88: undefined reference to `abort'
/opt/esp-open-sdk/sdk/lib/libgcc.a(unwind-dw2-fde.o): In function `read_encoded_value_with_base':
/home/wjg/Repo/esp-open-sdk-20170622/crosstool-NG/.build/src/gcc-4.8.5/libgcc/unwind-pe.h:257: undefined reference to `abort'
/opt/esp-open-sdk/sdk/lib/libgcc.a(unwind-dw2-fde.o): In function `base_from_object':
/home/wjg/Repo/esp-open-sdk-20170622/crosstool-NG/.build/src/gcc-4.8.5/libgcc/unwind-dw2-fde.c:256: undefined reference to `abort'
/opt/esp-open-sdk/sdk/lib/libgcc.a(unwind-dw2-fde.o): In function `start_fde_sort':
/home/wjg/Repo/esp-open-sdk-20170622/crosstool-NG/.build/src/gcc-4.8.5/libgcc/unwind-dw2-fde.c:409: undefined reference to `malloc'
/home/wjg/Repo/esp-open-sdk-20170622/crosstool-NG/.build/src/gcc-4.8.5/libgcc/unwind-dw2-fde.c:412: undefined reference to `malloc'
/opt/esp-open-sdk/sdk/lib/libgcc.a(unwind-dw2-fde.o): In function `end_fde_sort':
/home/wjg/Repo/esp-open-sdk-20170622/crosstool-NG/.build/src/gcc-4.8.5/libgcc/unwind-dw2-fde.c:575: undefined reference to `abort'
/home/wjg/Repo/esp-open-sdk-20170622/crosstool-NG/.build/src/gcc-4.8.5/libgcc/unwind-dw2-fde.c:590: undefined reference to `free'
/opt/esp-open-sdk/sdk/lib/libgcc.a(unwind-dw2-fde.o): In function `__register_frame':
/home/wjg/Repo/esp-open-sdk-20170622/crosstool-NG/.build/src/gcc-4.8.5/libgcc/unwind-dw2-fde.c:118: undefined reference to `malloc'
/opt/esp-open-sdk/sdk/lib/libgcc.a(unwind-dw2-fde.o): In function `__register_frame_table':
/home/wjg/Repo/esp-open-sdk-20170622/crosstool-NG/.build/src/gcc-4.8.5/libgcc/unwind-dw2-fde.c:156: undefined reference to `malloc'
/opt/esp-open-sdk/sdk/lib/libgcc.a(unwind-dw2-fde.o): In function `__deregister_frame_info_bases':
/home/wjg/Repo/esp-open-sdk-20170622/crosstool-NG/.build/src/gcc-4.8.5/libgcc/unwind-dw2-fde.c:200: undefined reference to `free'
/home/wjg/Repo/esp-open-sdk-20170622/crosstool-NG/.build/src/gcc-4.8.5/libgcc/unwind-dw2-fde.c:216: undefined reference to `abort'
/opt/esp-open-sdk/sdk/lib/libgcc.a(unwind-dw2-fde.o): In function `__deregister_frame':
/home/wjg/Repo/esp-open-sdk-20170622/crosstool-NG/.build/src/gcc-4.8.5/libgcc/unwind-dw2-fde.c:231: undefined reference to `free'

Something that catch my attention is that it seems the linker is trying to find many files in the path: "/home/wjg/Repo/" and I can confirm it doesn't exist in my computer. Can't understand this behavior.

Tools info:

OS: Ubuntu 16.04LTS

Compiler: xtensa-lx106-elf-g++ (crosstool-NG crosstool-ng-1.22.0-60-g37b07f6) 4.8.5

CMake: cmake version 3.12.0-rc3

nonos-sdk: 2.2.1

Peter Cordes
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Oshio
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  • Have you considered just using PlatformIO? It has great ESP8266 support using nonos-sdk (which the Arduino SDK is built on), and you won't need to muck around directly with the Xtensa toolchain. https://platformio.org/ – romkey Aug 14 '18 at 04:52
  • `it seems the linker is trying to find many files in the path: "/home/wjg/Repo/"` - No, the linker isn't trying to find these files. The linker just points to the usage of the unresolved symbols in `libgcc` library, which has been compiled from these source files (on another machine). After compiling, these files are no longer needed. No worries about that. – Tsyvarev Aug 14 '18 at 07:32
  • @JohnRomkey Thanks for this recommendation, I tested and my c++ code works perfectly. – Oshio Aug 19 '18 at 17:27

1 Answers1

1

Maybe you forgot to link against the C++ libraries? These are the libraries I use during linking my C++ files on the ESP8266:

-lhal -lphy -lpp -lnet80211 -llwip2 -lwpa -lcrypto -lmain -lwps \
-laxtls -lespnow -lsmartconfig -lairkiss -lwpa2 -lstdc++ -lm -lc -lgcc

Especially the -lstdc++ is important! Try to add those libraries to your makefile!

A. Terstegge
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