Re: Toolchain question

[Michael Zimmermann <sigmaepsilon92@gmail.com>]

> I use both, and never notice any difference. The primary differences
> are newlib vs glibc, and in some cases, whether symbols are decorated
> with a leading _
> The actual code generation is more dependent on the default target
> (i.e., -march/-mthumb for ARM) than bare-metal/hosted.

> I only ever use the native
> compiler under Linux, or one of the linaro "-linux-" flavours if
> cross-compiling.

I think that works because edk2 excludes all toolchain libs with -nostdlib
and fno-builtin.
I know from other bootloader projects like LK(LittleKernel) which link
against libgcc that compiling with anything but bare-metal toolchains makes
the resulting binary un-bootable.

Thanks
Michael

On Tue, Aug 9, 2016 at 10:39 AM, Leif Lindholm <leif.lindholm@linaro.org>
wrote:

> On Tue, Aug 09, 2016 at 06:07:36AM +0200, Michael Zimmermann wrote:
> > As for the kind of toolchain to use: there's always (at least) two types:
> > bare metal toolchains(arm-eabi,arm-none-eabi, aarch64-elf), and the ones
> > with a OS ABI(androideabi, linux-gnueabi,linux-gnueabihf, ...). While
> > unlike other bootloader/kernel projects EDK2 seems to work with all of
> them
> > I can only recommend using the bare metal variants.
> >
> > For ARM and AArch64 I recommend using linaro's latest stable release(5.3
> at
> > the time of writing):
> > http://www.linaro.org/downloads/
> > sometimes the website is out of date and you can go here directly:
> > https://releases.linaro.org/components/toolchain/binaries/
>
> So, while all of the above is fine, I only ever use the native
> compiler under Linux, or one of the linaro "-linux-" flavours if
> cross-compiling.
>
> I am however happy someone is testing the bare-metal profiles as well,
> since we need to keep the environment (i.e. build configuration) rigid
> enough that toolchain flavour does not affect things.
>
> > I've also CC'ed the Arm maintainers so you'll actually get answers unlike
> > me when I asked the same question about a year ago ;)
>
> Thanks :)
>
> Regards,
>
> Leif
>