Re: [Xen-devel] [PATCH] raisin: enable ovmf build for arm64

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 13/10/15 14:18, Stefano Stabellini wrote:
> On Tue, 13 Oct 2015, Ian Campbell wrote:
>> On Tue, 2015-10-13 at 13:49 +0100, Stefano Stabellini wrote:
>>> I didn't git clean enough. You are right, only -t GCC48 is required.
>>
>> What if only e.g. gcc-4.9 is available though?
> 
> It is just the no -t build that doesn't work. As far as I can tell
> looking at BaseTools/Conf/tools_def.template there is no difference
> between -t GCC49, -t GCC48 and -t GCC47 in terms of gcc flags.

The differences may be more subtle. I would be surprised if they
duplicate code just for having the variable name GCCXX matching the
version of the compiler.

For instance compiling using GCC 5.0 folds under GCC49. They didn't
bother to add a new GCCXX.

FWIW, the scripts to build x86 (OvmfPkg/build.sh) is detecting which
compiler is used and will setup the TARGET_TOOLS correctly:

    gcc_version=$(gcc -v 2>&1 | tail -1 | awk '{print $3}')
    case $gcc_version in
      4.5.*)
        TARGET_TOOLS=GCC45
        ;;
      4.6.*)
        TARGET_TOOLS=GCC46
        ;;
      4.7.*)
        TARGET_TOOLS=GCC47
        ;;
      4.8.*)
        TARGET_TOOLS=GCC48
        ;;
      4.9.*|4.1[0-9].*|5.*.*)
        TARGET_TOOLS=GCC49
        ;;
      *)
        TARGET_TOOLS=GCC44
        ;;
    esac

A couple of weeks ago I've looked at porting this script for ARM but it
wasn't trivial to do it (i.e requiring more than a couple of hours to
fix it).

Regards,

-- 
Julien Grall

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