Building EDK2 code on arm64 (aarch64) - BaseTools fails

["Rebecca Cran" <rebecca@bluestop.org>]

Is there any expectation that EDK2 will build on non-x86 systems?

I tried building BaseTools (from git master, 
ae2fb9ead47b5abaf2a4e815b5f57c8f4838b221) using GCC 8.2 on a SoftIron 
OverDrive 1000 (running FreeBSD) but there are lots of errors, such as:


gcc  -c  -I .. -I ../Include/Common -I ../Include/ -I 
../Include/IndustryStandard -I ../Common/ -I .. -I . -I ../Include/Arm/  
-MD -fshort-wchar -fno-strict-aliasing -Wall -Werror 
-Wno-deprecated-declarations -Wno-stringop-truncation -Wno-restrict 
-Wno-unused-result -nostdlib -g -O2  BasePeCoff.c -o BasePeCoff.o
BasePeCoff.c: In function 'PeCoffLoaderGetPeHeader':
BasePeCoff.c:120:49: error: cast from pointer to integer of different 
size [-Werror=pointer-to-int-cast]
    *PeHdr = (EFI_IMAGE_OPTIONAL_HEADER_UNION *) 
((UINTN)ImageContext->Handle + ImageContext->PeCoffHeaderOffset);
                                                  ^
BasePeCoff.c:120:12: error: cast to pointer from integer of different 
size [-Werror=int-to-pointer-cast]
    *PeHdr = (EFI_IMAGE_OPTIONAL_HEADER_UNION *) 
((UINTN)ImageContext->Handle + ImageContext->PeCoffHeaderOffset);
             ^
BasePeCoff.c: In function 'PeCoffLoaderImageAddress':
BasePeCoff.c:551:10: error: cast to pointer from integer of different 
size [-Werror=int-to-pointer-cast]
    return (UINT8 *) ((UINTN) ImageContext->ImageAddress + Address);
           ^


-- 
Rebecca Cran