The following commit broke the UefiPayloadPkg build:

Environment: GCC5 / openSUSE 15.x

 build -a IA32 -a X64 -p UefiPayloadPkg/UefiPayloadPkg.dsc -b DEBUG -t GCC5 -D BOOTLOADER=COREBOOT

Build log:
/home/lxuser/edk2/edk2-orig/UefiPayloadPkg/Library/PayloadEntryHobLib/Hob.c:80:30: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
   Hob->EfiMemoryTop        = (EFI_PHYSICAL_ADDRESS) EfiMemoryTop;
                              ^
/home/lxuser/edk2/edk2-orig/UefiPayloadPkg/Library/PayloadEntryHobLib/Hob.c:81:30: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
   Hob->EfiMemoryBottom     = (EFI_PHYSICAL_ADDRESS) EfiMemoryBottom;
                              ^
/home/lxuser/edk2/edk2-orig/UefiPayloadPkg/Library/PayloadEntryHobLib/Hob.c:82:30: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
   Hob->EfiFreeMemoryTop    = (EFI_PHYSICAL_ADDRESS) EfiFreeMemoryTop;
                              ^

The below patch fixes the build, however I'm not sure if this is the best way to solve the issue - or if there are any side effects:

diff --git a/UefiPayloadPkg/Library/PayloadEntryHobLib/Hob.c b/UefiPayloadPkg/Library/PayloadEntryHobLib/Hob.c
index 768c3db770..53ee1440f5 100644
--- a/UefiPayloadPkg/Library/PayloadEntryHobLib/Hob.c
+++ b/UefiPayloadPkg/Library/PayloadEntryHobLib/Hob.c
@@ -77,9 +77,9 @@ HobConstructor (
   Hob->Version             = EFI_HOB_HANDOFF_TABLE_VERSION;
   Hob->BootMode            = BOOT_WITH_FULL_CONFIGURATION;

-  Hob->EfiMemoryTop        = (EFI_PHYSICAL_ADDRESS) EfiMemoryTop;
-  Hob->EfiMemoryBottom     = (EFI_PHYSICAL_ADDRESS) EfiMemoryBottom;
-  Hob->EfiFreeMemoryTop    = (EFI_PHYSICAL_ADDRESS) EfiFreeMemoryTop;
+  Hob->EfiMemoryTop        = (EFI_PHYSICAL_ADDRESS) (UINTN)EfiMemoryTop;
+  Hob->EfiMemoryBottom     = (EFI_PHYSICAL_ADDRESS) (UINTN)EfiMemoryBottom;
+  Hob->EfiFreeMemoryTop    = (EFI_PHYSICAL_ADDRESS) (UINTN)EfiFreeMemoryTop;
   Hob->EfiFreeMemoryBottom = (EFI_PHYSICAL_ADDRESS) (UINTN) (HobEnd+1);
   Hob->EfiEndOfHobList     = (EFI_PHYSICAL_ADDRESS) (UINTN) HobEnd;

Thanks,

Sumo