Linker problem with typeinfo for fs::FileImpl in version 5.3.0 & arduino core 2.0.6

[rvbc1]

All files are compiling ok, but linker returns error as below
.platformio/packages/toolchain-xtensa-esp32/bin/../lib/gcc/xtensa-esp32-elf/8.4.0/../../../../xtensa-esp32-elf/bin/ld: build/local/esp-idf/framework-arduinoespressif32/libframework-arduinoespressif32.a(vfs_api.o):(.rodata._ZTI11VFSFileImpl[typeinfo for VFSFileImpl]+0x8): undefined reference to typeinfo for fs::FileImpl'`
On Version 5.2.0 & Arduino core 2.0.5 code is compiling ok

[Jason2866]

Example Sketch? There are code changes in Arduino for this part. You probably have to adopt your code.

[alex-code]

I just updated to 5.3 and get this error too on code that previously compiled ok.

Googling for solutions I found mention of RTTI.
I'm using build_unflags = -fno-rtti as there's use of dynamic_cast

Possibly related espressif/arduino-esp32#7585

[Jason2866]

@alex-code The toolchains (compiler) does not support rtti. You cant do build_unflags = -fno-rtti

[alex-code]

@alex-code The toolchains (compiler) does not support rtti. You cant do build_unflags = -fno-rtti

Been working for me before 5.3

This compiles on 5.2

; Condensed
platform = [email protected]
build_flags =
	-std=gnu++17
build_unflags =
	-std=gnu++11
	-fno-rtti

This fails on 5.3

; Condensed
platform = [email protected]
build_flags =
	-std=gnu++17
build_unflags =
	-std=gnu++11
	-fno-rtti

c:/users/me/.platformio/packages/[email protected]+2021r2-patch5/bin/../lib/gcc/xtensa-esp32-elf/8.4.0/../../../../xtensa-esp32-elf/bin/ld.exe: .pio/build/firebeetle2/lib0e2/libFS.a(vfs_api.cpp.o):(.rodata._ZTI11VFSFileImpl[_ZTI11VFSFileImpl]+0x8): undefined reference to typeinfo for fs::FileImpl'

[Jason2866]

Exactly, toolchains changed from 5.2.0 to 5.3.0 from patch3 to patch5.
rtti was never supported correctly in the toolchains. Espressif fixed this and removed the faulty rtti support in patch5 tool chains.
Anyways this is not a platformio issue, since Arduino IDE behaviour is the same.
There is a reason why -fno-rtti is set as default ;-)

[valeros]

Thanks @Jason2866 for clarifying. Indeed seems like the issue is caused by updated toolchains which is out of our control. Anyone who's experiencing the same issue please update your project configuration as described above.

[LK-Simon]

This is not resolved, and is indeed a serious problem!

Just because your library doesn't use RTTI, doesn't mean there aren't plenty of us with code that DOES reliably and with necessity use RTTI.

[Jason2866]

@LK-Simon At the end the issue was something different ;-).
The fix espressif/arduino-esp32#8768

Currently not in any released core. Fix will be included in core 3.0.0 and the fix is backported in bug fix core 2.0.15. Whenever both core will be released. As long this is not happened you have to do the change locally.

[LK-Simon]

@LK-Simon At the end the issue was something different ;-). The fix espressif/arduino-esp32#8768

Currently not in any released core. Fix will be included in core 3.0.0 and the fix is backported in bug fix core 2.0.15. Whenever both core will be released. As long this is not happened you have to do the change locally.

Hi @Jason2866, how do I get Platformio to use the fixed version of the core? :) This has been driving me nuts because my Event Engine absolutely requires RTTI, and I have other issues that make using an older version of the ESP lib untenable.

[Jason2866]

@LK-Simon This should work:

platform = espressif32 @ 6.5.0
platform_packages = framework-arduinoespressif32 @ https://github.com/espressif/arduino-esp32.git#release/v2.x

[LK-Simon]

@LK-Simon This should work:

platform = espressif32 @ 6.5.0
platform_packages = framework-arduinoespressif32 @ https://github.com/espressif/arduino-esp32.git#release/v2.x

You, sir, are a life-saver!

[MatersM]

Exactly run into the same issue.... it works now, great @Jason2866

[mathemaphysics]

This is an error on their part. I've overridden the build options to use -frtti everywhere. It works. Their compiler does not find this single typeinfo. This is the only one. Just libFS.a can't find fs::FileImpl's typeinfo. That's it. Nothing else.

This looks to be a compiler issue.

[Jason2866]

@mathemaphysics you have to add this change in your framework https://github.com/espressif/arduino-esp32/pull/8768/files