VS Arduino - Enabling RTTI when compiling

Apr 18^th, 2024 at 9:02pm (UTC)

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VS Arduino › Visual Micro › General Board › Enabling RTTI when compiling

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Enabling RTTI when compiling (Read 4895 times)

Bas Junior Member Offline Posts: 50 Joined: Feb 20^th, 2017	Enabling RTTI when compiling Sep 15^th, 2017 at 10:09pm	Print Post
	I would like to use dynamic_cast<> i my code but when I do i get the error Quote: error: 'dynamic_cast' not permitted with -fno-rtti How do I enable this compiler option? Strange thing is that i cannot find this option in the verbose log of the compiler.

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Bas Junior Member Offline Posts: 50 Joined: Feb 20^th, 2017	Re: Enabling RTTI when compiling Reply #1 - Sep 16^th, 2017 at 2:29pm	Print Post
	I've found where to enable the rtti option, in the platform.txt file of the board Code compiler.cpp.flags=-c -g -Os {compiler.warning_flags} -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -MMD -flto -frtti This actually works and compiles the c++ files with rtti enabled. BUT .... Now the linker is tripping over something and sends me the following message: Quote: Linking it all together ... 3.5.4-arduino2/bin/avr-g++" -w -Os -g -flto -fuse-linker-plugin -Wl,--gc-sections,--relax -mmcu=atmega2560 -o o.elf" [..removed rest of command ...] ccNLxbjy.ltrans1.ltrans.o: (.rodata+0x10a): undefined reference to vtable for __cxxabiv1::__class_type_info ccNLxbjy.ltrans1.ltrans.o: (.rodata+0x186): undefined reference to vtable for __cxxabiv1::__vmi_class_type_info ccNLxbjy.ltrans1.ltrans.o: (.rodata+0x19a): undefined reference to vtable for __cxxabiv1::__class_type_info ccNLxbjy.ltrans1.ltrans.o: (.rodata+0x19e): undefined reference to vtable for __cxxabiv1::__class_type_info ccNLxbjy.ltrans1.ltrans.o*: (.rodata+0x1a2): undefined reference to vtable for __cxxabiv1::__si_class_type_info Anybody any idea how to solve this?


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Tim@Visual Micro Administrator Offline Posts: 12076 Location: United Kingdom Joined: Apr 10^th, 2010	Re: Enabling RTTI when compiling Reply #2 - Sep 16^th, 2017 at 2:59pm	Print Post
	Hi, If you think visual micro can be changed in anyway to help you then I am keen to hear any suggestions. Sadly I don't think I can help as is. You are into the cpp world and how the arduino build process works. The linker command is also in platform.txt but I suspect that the issue is slightly more complex. For testing you can paste chosen platform.txt lines into a board.txt in the local project. Click save after making changes to board.txt then click build and platform.txt commands will be overridden where specified in board.txt It's easier than clicking rescan each time you change platform.txt


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Bas Junior Member Offline Posts: 50 Joined: Feb 20^th, 2017	Re: Enabling RTTI when compiling Reply #3 - Sep 16^th, 2017 at 3:04pm	Print Post
	So if i understand correctly than a boards.txt file in the project will override the boards.txt and platform.txt in the arduino library? Can i also make a platform.local.txt in the project? Thanks for the tip
	« Last Edit: Sep 16^th, 2017 at 3:05pm by Bas »

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Tim@Visual Micro Administrator Offline Posts: 12076 Location: United Kingdom Joined: Apr 10^th, 2010	Re: Enabling RTTI when compiling Reply #4 - Sep 16^th, 2017 at 3:13pm	Print Post
	Ah no, it's called a board.txt singular. Consider that the board out of boards.txt and platform.txt and platform.local are all merged prior to compile. Just after that anything in board.txt is applied. Then the compile happens. So the core files must exists as normal and board.txt used just to tweak a few settings.


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Bas Junior Member Offline Posts: 50 Joined: Feb 20^th, 2017	Re: Enabling RTTI when compiling Reply #5 - Sep 16^th, 2017 at 5:50pm	Print Post
	Ok,thanks, that's clear! When i have shared projects in my solution, does every project have to have its own board.txt or is the boards.txt in the main project used for compiling all shared projects too?


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Tim@Visual Micro Administrator Offline Posts: 12076 Location: United Kingdom Joined: Apr 10^th, 2010	Re: Enabling RTTI when compiling Reply #6 - Sep 16^th, 2017 at 6:06pm	Print Post
	The board.txt can only exist in normal projects, not shared projects. A shared project is never built and does not have an architecture. Shared projects are always merged with the main project during compile. The architecture and build properties of the main project are used for intellisense and build. This means that one shared project can be compiled with different sets of build properties.


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