Re: [PATCH-for-5.0] roms/edk2-funcs: Force armhf toolchain prefix on Debian

[Laszlo Ersek <lersek@redhat.com>]

On 12/05/19 19:17, Ard Biesheuvel wrote:
> On Thu, 5 Dec 2019 at 18:09, Philippe Mathieu-Daudé <philmd@redhat.com> wrote:
>>
>> The Debian (based) distributions historically provides 2 ARM
>> toolchains, documented as [1]:
>>
>> * The ARM EABI (armel) port targets a range of older 32-bit ARM
>>   devices, particularly those used in NAS hardware and a variety
>>   of *plug computers.
>> * The newer ARM hard-float (armhf) port supports newer, more
>>   powerful 32-bit devices using version 7 of the ARM architecture
>>   specification.
>>
>> The EDK2 documentation suggests to use the hard-float toolchain.
>>
> 
> We should probably fix that.

OK, I'm confused. What case are we talking about?

(1) Without this patch, "roms/edk2-funcs.sh" fails to select *any* cross
compiler on Debian, and the build just croaks.

--> insist on armhf in this script?
--> insist on armel in this script?
--> pick whichever is available, because either works?

(2) Without this patch, "roms/edk2-funcs.sh" selects the "armel" flavor,
and it fails to build edk2.

--> insist on armhf in this script?

(3) Without this patch, "roms/edk2-funcs.sh" selects the "armel" flavor,
and it builds edk2 just fine -- but that's not the flavor that the edk2
documentation suggests.

--> drop this patch, and fix the edk2 docs?

Thanks,
Laszlo

> tools_def.template mentions
> arm-linux-gnueabi, and while it does not really matter in most cases,
> if you are using Clang, you actually need the armel binutils (see
> 41203b9ab5d48e029f24e17e9a865e54b7e1643d for details)
> 
> 
>> Force the armhf cross toolchain prefix on Debian distributions.
>>
>> [1] https://www.debian.org/ports/arm/#status
>> [2] https://github.com/tianocore/edk2-platforms/blob/master/Readme.md#if-cross-compiling
>>
>> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
>> ---
>>  roms/edk2-funcs.sh | 3 +++
>>  1 file changed, 3 insertions(+)
>>
>> diff --git a/roms/edk2-funcs.sh b/roms/edk2-funcs.sh
>> index 3f4485b201..a546aa1d11 100644
>> --- a/roms/edk2-funcs.sh
>> +++ b/roms/edk2-funcs.sh
>> @@ -112,6 +112,9 @@ qemu_edk2_get_cross_prefix()
>>       ( [ "$gcc_arch" == i686 ] && [ "$host_arch" == x86_64 ] ); then
>>      # no cross-compiler needed
>>      :
>> +  elif ( [ -e /etc/debian_version ] && [ "$gcc_arch" == arm ] ); then
>> +    # force hard-float cross-compiler on Debian
>> +    printf 'arm-linux-gnueabihf-'
>>    else
>>      printf '%s-linux-gnu-\n' "$gcc_arch"
>>    fi
>> --
>> 2.21.0
>>
>