C++ STL header include problem

[MarkoSagadin]

Commit 3220e63 compiles most of files right now, however compilation stops at one file that includes vector header from c++ library.
Compiler output is following:

[490/613] Building C object CMakeFiles/app.dir/src/main.c.obj
FAILED: CMakeFiles/app.dir/src/main.c.obj 
ccache /home/skobec/zephyr-sdk-0.11.4/arm-zephyr-eabi/bin/arm-zephyr-eabi-gcc -DBUILD_VERSION=v2.3.0-rc1-ncs1 -DKERNEL -DNRF52840_XXAA -DUSE_PARTITION_MANAGER=0 -D_FORTIFY_SOURCE=2 -D__LINUX_ERRNO_EXTENSIONS__ -D__PROGRAM_START -D__ZEPHYR__=1 -I../. -I../src -I../tflite-model -I../model-parameters -I../edge-impulse-sdk -I../edge-impulse-sdk/third_party/ruy -I../edge-impulse-sdk/third_party/gemmlowp -I../edge-impulse-sdk/third_party/flatbuffers/include -I../edge-impulse-sdk/third_party -I../edge-impulse-sdk/tensorflow/lite/schema -I../edge-impulse-sdk/tensorflow -I../edge-impulse-sdk/porting -I../edge-impulse-sdk/dsp/speechpy -I../edge-impulse-sdk/dsp/spectral -I../edge-impulse-sdk/dsp/kissfft -I../edge-impulse-sdk/dsp/dct -I../edge-impulse-sdk/dsp -I../edge-impulse-sdk/classifier -I../edge-impulse-sdk/anomaly -I../edge-impulse-sdk/CMSIS/NN/Include -I../edge-impulse-sdk/CMSIS/DSP/PrivateInclude -I../edge-impulse-sdk/CMSIS/DSP/Include -I../edge-impulse-sdk/CMSIS/Core/Include -I/home/skobec/Programs/ncs/zephyr/include -Izephyr/include/generated -I/home/skobec/Programs/ncs/zephyr/soc/arm/nordic_nrf/nrf52 -I/home/skobec/Programs/ncs/zephyr/lib/libc/newlib/include -I/home/skobec/Programs/ncs/nrf/include -I/home/skobec/Programs/ncs/modules/hal/cmsis/CMSIS/Core/Include -I/home/skobec/Programs/ncs/modules/hal/nordic/nrfx -I/home/skobec/Programs/ncs/modules/hal/nordic/nrfx/drivers/include -I/home/skobec/Programs/ncs/modules/hal/nordic/nrfx/mdk -I/home/skobec/Programs/ncs/modules/hal/nordic/. -I/home/skobec/Programs/ncs/modules/debug/segger/rtt -isystem /home/skobec/Programs/ncs/nrfxlib/crypto/nrf_cc310_platform/include -Os -imacros/home/skobec/work/example-standalone-inferencing-nrf52-zephyr/build/zephyr/include/generated/autoconf.h -ffreestanding -fno-common -g -mcpu=cortex-m4 -mthumb -mabi=aapcs -imacros/home/skobec/Programs/ncs/zephyr/include/toolchain/zephyr_stdint.h -Wall -Wformat -Wformat-security -Wno-format-zero-length -Wno-main -Wno-address-of-packed-member -Wno-pointer-sign -Wpointer-arith -Wno-unused-but-set-variable -Werror=implicit-int -fno-asynchronous-unwind-tables -fno-pie -fno-pic -fno-strict-overflow -fno-reorder-functions -fno-defer-pop -fmacro-prefix-map=/home/skobec/work/example-standalone-inferencing-nrf52-zephyr=CMAKE_SOURCE_DIR -fmacro-prefix-map=/home/skobec/Programs/ncs/zephyr=ZEPHYR_BASE -fmacro-prefix-map=/home/skobec/Programs/ncs=WEST_TOPDIR -ffunction-sections -fdata-sections -specs=nano.specs -std=c99 -fdiagnostics-color=always -MD -MT CMakeFiles/app.dir/src/main.c.obj -MF CMakeFiles/app.dir/src/main.c.obj.d -o CMakeFiles/app.dir/src/main.c.obj   -c ../src/main.c
In file included from .././edge-impulse-sdk/dsp/spectral/spectral.hpp:27,
                 from ../edge-impulse-sdk/classifier/ei_run_dsp.h:27,
                 from ../edge-impulse-sdk/classifier/ei_run_classifier.h:30,
                 from ../src/main.c:2:
.././edge-impulse-sdk/dsp/spectral/processing.hpp:26:10: fatal error: vector: No such file or directory
   26 | #include <vector>
      |          ^~~~~~~~
compilation terminated.
[499/613] Building CXX object CMakeFiles/app.dir/edge-impulse-sdk/tensorflow/lite/micro/recording_micro_allocator.cc.obj
ninja: build stopped: subcommand failed.
FATAL ERROR: command exited with status 1: /usr/bin/cmake --build /home/skobec/work/example-standalone-inferencing-nrf52-zephyr/build

Same error happens if I try to compile cpp_synchroization after adding #include <vector> header into its main.
Zephyr had a issue like this in past: zephyrproject-rtos/zephyr#15603, however they seemed to resolve it.

I should try compiling this on regular zephyr commit, to see if this happens there as well.

[MarkoSagadin]

No, it seems that problem is also present when compiling with regular zephyr.

[MarkoSagadin]

This was solved by adding below lines above find package:

set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CONFIG_LIB_CPLUSPLUS ON)
set(CONFIG_NEWLIB_LIBC ON)

This issue can be closed.