On 08/13/19 03:13, Chen, Farrah wrote:
> Hi,
>
> When build ovmf with the latest two commits of master branch, we meet error
> on Red Hat 7.6 with gcc version 4.8.5, but succeed on Red Hat 8.0 with gcc
> version 8.2.1.
>
> Steps:
> git clone https://github.com/tianocore/edk2.git
> cd edk2
> git submodule init
> git submodule update -recursive
> OvmfPkg/build.sh -a X64 -n 64
>
> Error log:
> .......
> /home/build/kvm_build/nightly/kvm_qemu/kvm-next-20190813010558-a738b5e7-5e7bcdcf/edk2/MdeModulePkg/Core/DxeIplPeim/X64/VirtualMemory.c:641:50:
> error: 'PageMapLevel5Entry' may be used uninitialized in this function
> [-Werror=maybe-uninitialized]
> PAGE_MAP_AND_DIRECTORY_POINTER *PageMapLevel5Entry;
> ^
> cc1: all warnings being treated as errors
> "objcopy"
> /home/build/kvm_build/nightly/kvm_qemu/kvm-next-20190813010558-a738b5e7-5e7bcdcf/edk2/Build/OvmfX64/DEBUG_GCC48/X64/MdeModulePkg/Bus/Pci/PciHostBridgeDxe/PciHostBridgeDxe/DEBUG/PciHostBridgeDxe.dll
> "GenFw" -e UEFI_DRIVER -o
> /home/build/kvm_build/nightly/kvm_qemu/kvm-next-20190813010558-a738b5e7-5e7bcdcf/edk2/Build/OvmfX64/DEBUG_GCC48/X64/OvmfPkg/XenBusDxe/XenBusDxe/OUTPUT/XenBusDxe.efi
>
> /home/build/kvm_build/nightly/kvm_qemu/kvm-next-20190813010558-a738b5e7-5e7bcdcf/edk2/Build/OvmfX64/DEBUG_GCC48/X64/OvmfPkg/XenBusDxe/XenBusDxe/DEBUG/XenBusDxe.dll
> make: ***
> [/home/build/kvm_build/nightly/kvm_qemu/kvm-next-20190813010558-a738b5e7-5e7bcdcf/edk2/Build/OvmfX64/DEBUG_GCC48/X64/MdeModulePkg/Core/DxeIplPeim/DxeIpl/OUTPUT/X64/VirtualMemory.obj]
> Error 1
> cp -f
> /home/build/kvm_build/nightly/kvm_qemu/kvm-next-20190813010558-a738b5e7-5e7bcdcf/edk2/Build/OvmfX64/DEBUG_GCC48/X64/OvmfPkg/XenBusDxe/XenBusDxe/OUTPUT/XenBusDxe.efi
>
> /home/build/kvm_build/nightly/kvm_qemu/kvm-next-20190813010558-a738b5e7-5e7bcdcf/edk2/Build/OvmfX64/DEBUG_GCC48/X64/OvmfPkg/XenBusDxe/XenBusDxe/DEBUG
>
>
> build.py...
> : error 7000: Failed to execute command
> make tbuild
> [/home/build/kvm_build/nightly/kvm_qemu/kvm-next-20190813010558-a738b5e7-5e7bcdcf/edk2/Build/OvmfX64/DEBUG_GCC48/X64/MdeModulePkg/Core/DxeIplPeim/DxeIpl]
>
>
>
>
> build.py...
> : error F002: Failed to build module
>
> /home/build/kvm_build/nightly/kvm_qemu/kvm-next-20190813010558-a738b5e7-5e7bcdcf/edk2/MdeModulePkg/Core/DxeIplPeim/DxeIpl.inf
> [X64, GCC48, DEBUG]
>
> - Failed -
> Build end time: 08:46:33, Aug.13 2019
> Build total time: 00:01:15
>
> GCC:
> gcc --version
> gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-36)
> Copyright (C) 2015 Free Software Foundation, Inc.
> This is free software; see the source for copying conditions. There is NO
> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
This bug was introduced in commit b3527dedc395 ("MdeModulePkg/DxeIpl:
Create 5-level page table for long mode", 2019-08-09).
It's being addressed in the following (pending) patch:
[edk2-devel] [PATCH 1/1] MdeModulePkg/DxeIplPeim: Relocate the operation
of PageMapLevel5Entry++
(I'm calling the issue a bug and not an invalid compiler warning because
the patch looks like an actual fix.)
Thanks
Laszlo
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