Fixes esp32_out.ld error

[chopmann]

No description provided.

[chopmann]

I have a working Demo with c++17 and the newer toolchain
https://github.com/HamburgChimps/ibis_wagenbus

[atanisoft]

@chopmann it isn't about having support for a newer version or not. The esp-idf build scripts default the gnu++11. I have also successfully overridden this to use c++14 without issues, even on esp-idf v3.x.

[chopmann]

@chopmann it isn't about having support for a newer version or not. The esp-idf build scripts default the gnu++11. I have also successfully overridden this to use c++14 without issues, even on esp-idf v3.x.

I know that. Of course it works with c++14 with platformio. What im saying is:
the current package toolchain-xtensa32 wont work with this PR or #3670
As far as I understood it needs the newer toolchain with gcc8.2 and not the older one

esp-idf v3.x. -->https://docs.espressif.com/projects/esp-idf/en/v3.3.1/get-started/linux-setup.html (GCC 5.2)
esp-idf v4.x --> https://www.esp32.com/viewtopic.php?f=10&t=7400&p=31257#p41667

[atanisoft]

That is correct, PlatformIO can not use IDF v4 without a lot of major reworking in PlatformIO core.

I no longer use PlatformIO, but your example of using gnu++17 linked above is the only approach usable with PlatformIO. It will not work outside of that env and won't work for those using cmake based esp-idf builds that include arduino-esp32. For cmake there is a way to do it but it would be better if it was configurable from the esp-idf side instead.