Hi Andrew,

There are compiler flags we set to suppress some of these types of specific warnings to avoid disable warnings as errors.

For example, this commit to tools_def.template:

https://github.com/tianocore/edk2/commit/8e985ac3fdb2b117968ac1fa1f54666e166af8ac

I would like to see the compiler, version, arch, log info with the specific warning being flagged to see if we can apply the techniques we have been able to apply in the past.

Mike

From: Andrew (EFI) Fish <afish@apple.com>
Sent: Wednesday, August 16, 2023 10:41 AM
To: edk2-devel-groups-io <devel@edk2.groups.io>; Kinney, Michael D <michael.d.kinney@intel.com>
Cc: wangliu@iscas.ac.cn
Subject: Re: [edk2-devel] Can RELEASE target disable -Werror CC_FLAG？

Mike,

I seem to remember it was a maybe-uninitialized compiler error. The DEBUG build did not hit it due to the NULL check in the ASSERT. The NULL check only exists if ASSERT() is enabled. So if ASSERT is disabled this code in the DXE Core will dereference a NULL pointer.

ASSERT (Prot != NULL);

//

// EFI_ALREADY_STARTED is not an error for bus driver.

// Return the corresponding protocol interface.

//

*Interface = Prot->Interface;

Thanks,

Andrew Fish

On Aug 16, 2023, at 10:02 AM, Michael D Kinney <michael.d.kinney@intel.com> wrote:
Can you provide the specific build error?

So far, we have not had to relax that flag for any RELEASE builds.

Thanks,

Mike
From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of ??
Sent: Wednesday, August 16, 2023 12:46 AM
To: Andrew (EFI) Fish <afish@apple.com>
Cc: edk2-devel-groups-io <devel@edk2.groups.io>
Subject: Re: [edk2-devel] Can RELEASE target disable -Werror CC_FLAG？

Yes, the RELEASE build compiler flags should be relaxed, all error checks that the DEBUG target should do, it doesn't belong to the RELEASE's job.

---
OvmfPkg/RiscVVirt/RiscVVirtQemu.dsc | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/OvmfPkg/RiscVVirt/RiscVVirtQemu.dsc b/OvmfPkg/RiscVVirt/RiscVVirtQemu.dsc
index 28d9af4..ac3b5ec 100644
--- a/OvmfPkg/RiscVVirt/RiscVVirtQemu.dsc
+++ b/OvmfPkg/RiscVVirt/RiscVVirtQemu.dsc
@@ -54,7 +54,7 @@
!include MdePkg/MdeLibs.dsc.inc

[BuildOptions]
- GCC:RELEASE_*_*_CC_FLAGS       = -DMDEPKG_NDEBUG
+ GCC:RELEASE_*_*_CC_FLAGS       = -flto
!ifdef $(SOURCE_DEBUG_ENABLE)
  GCC:*_*_RISCV64_GENFW_FLAGS    = --keepexceptiontable
!endif
--
2.39.1

I have added the LTO flag and dropped MDEPKG_NDEBUG in the .dsc file, it compiled successfully, the build log:https://build.tarsier-infra.com/package/live_build_log/home:ouuleilei:branches:openEuler:Mainline/edk2/openEuler_Mainline_standard_riscv64_gcc/riscv64

Do you have other way to add LTO flag to compile that don't change the source code, i tried to use environment variable, like exported CFLAGS=-flto to compile, but the compiler doesn't work with it.
-----原始郵件-----
發件人:"Andrew (EFI) Fish" <afish@apple.com>
發送時間:2023-08-10 21:50:55 (星期四)
收件人: edk2-devel-groups-io <devel@edk2.groups.io>, wangliu@iscas.ac.cn
抄送:
主題: Re: [edk2-devel] Can RELEASE target disable -Werror CC_FLAG？
I think that you are advocating that since we have code that error checks on DEBUG and not RELEASE builds we should relax the RELEASE build compiler flags?
/home/abuild/rpmbuild/BUILD/edk2-edk2-stable202305/MdeModulePkg/Core/Dxe/Hand/Handle.c:1183:24: error: ‘Prot’ may be used uninitialized [-Werror=maybe-uninitialized]
ASSERT (Prot != NULL);

//

// EFI_ALREADY_STARTED is not an error for bus driver.

// Return the corresponding protocol interface.

//

*Interface = Prot->Interface;

A given platform can add ASSERT into release builds if it wants. I’ve actually done that for power on before. If your compiler supports LTO you are not required to set MDEPKG_NDEBUG on RELEASE builds, and you can used a PCD to configure your debug level, per build type.

Maybe we should just have the error checks in all paths?

Thanks,

Andrew Fish

On Aug 10, 2023, at 6:44 AM, 汪流 <wangliu@iscas.ac.cn> wrote:

I want to build a rpm package for edk2-stable202305 on riscv64, however I get some uninitialized variable error, I have found that the reason is -Werror flag.
My build target was release. I think the flag should used in the debug ,not in release.
My build command: build -t GCC5 -n $NCPUS -b RELEASE -a RISCV64 -p OvmfPkg/RiscVVirt/RiscVVirtQemu.dsc -D SECURE_BOOT_ENABLE=TRUE -D TPM_ENABLE=TRUE -D TPM_CONFIG_ENABLE=TRUE

This is my packet log:

https://build.tarsier-infra.com/package/live_build_log/home:ouuleilei:branches:home:ouuleilei:branches:openEuler:Mainline/edk2-test/openEuler_Mainline_standard_riscv64_gcc/riscv64

https://build.tarsier-infra.com/build/home:ouuleilei:branches:home:ouuleilei:branches:openEuler:Mainline/openEuler_Mainline_standard_riscv64_gcc/riscv64/edk2-test/_log