C++ Support

[neil-jones-blaize]

Sorry fairly new to Zephyr, hopefully this is something simple.

Currently using version 4.0.0 and the zephyr supplied aarch64-zephyr-elf toolchain (gcc 12).

All is working well for C based applications, we have ported over our board and C apps work fine.

But today I tried to port a C++ app over and it fails with:

In file included from /home/njones/src/zephyr/include/zephyr/types.h:11,
                 from /home/njones/src/zephyr/include/zephyr/kernel_includes.h:21,
                 from /home/njones/src/zephyr/include/zephyr/kernel.h:17,
                 from /home/njones/src/zephyr/arch/arm64/core/offsets/offsets.c:29:
/home/njones/src/zephyr/toolchain/aarch64-zephyr-elf/lib/gcc/aarch64-zephyr-elf/12.2.0/include/stdint.h:9:16: fatal error: stdint.h: No such file or directory

I get this even if I build samples/cpp/hello_world for rpi_5

In both my app and the sample app the config for CPP is:

CONFIG_CPP=y
CONFIG_REQUIRES_FULL_LIBCPP=y

Any help appreciated,

Cheers,
Neil

[TD-JBL]

I have

CONFIG_CPP=y
CONFIG_STD_CPP20=y
CONFIG_GNU_C_EXTENSIONS=y
CONFIG_GLIBCXX_LIBCPP=y

in my CPP example and have no issues with <stdint.h> or other includes like <type_traits>.

[neil-jones-blaize]

Note I'm not using west for building, this is in a CI so trying to keep things simple

I think this issue was caused by me only downloading the toolchain and setting CROSS_COMPILE (which worked fine for anything C based)

I now download the full SDK, but only install the ARM toolchain, then set ZEPHYR_TOOLCHAIN_BASE, this then works for C++ apps as well.