Platformio (Visual Code): Intellisense issues, cannot open source file stdlib.h (unrecognized command line option '-m64')

DerMaister · November 23, 2019, 5:02pm

The reason for the problem was found:

Platform/Architecture/Compiler agnostic IntelliSense modes

opened 09:26AM - 22 Nov 19 UTC

Language Service Feature Request Feature: Configuration Feature: IntelliSense Mode

Hi. As of #4644 -m32/m64 argument is now being added whenever compiler built-…ins are probed. This change however breaks any GCC that does not actually target x86/x64 or certain other platforms that have those command line options available; E.g. ARM/AArch64 are among those that do not have such options. It is not possible to ignore any unknown command line options (except for -Wno), so e.g. passing some other option thru compilerArgs to easily overcome this issue is not possible. Of course, it's always possible to do a wrapper kludge, which would modify command line arguments and only after that do the actual GCC call, but that's really pushing it too far and would not solve this issue for anyone else except me. I have no idea how Clang behaves on this matter, perhaps it has more relaxed command line argument parsing. I wonder, if there could be some either some option to specify the command line options ("compilerArgsProbe") which are used for probing for any platform-specific (machine-depedent in GCC lingo) options, or better still, if there would be some other mode ("gcc-other") to inform that the compiler isn't really targetting x86/x64 and just some best effort style is to be expected, instead of completely bailing out and doing nothing. I see that #4271 has a similar type of request (arm/arm64 intellSenseMode), and now after the change mentioned above that would do the job, too.

Solution: return to version 0.26.2-insiders