Messages in this thread | | | Date | Fri, 29 Oct 2021 10:09:26 -0700 | Subject | Re: [PATCH V2 01/15] selftests/x86/sgx: Fix a benign linker warning | From | Reinette Chatre <> |
| |
Hi Dave,
On 10/28/2021 5:26 PM, Dave Hansen wrote: > On 10/28/21 1:37 PM, Reinette Chatre wrote: >> From: Sean Christopherson <sean.j.christopherson@intel.com> >> >> Pass a build id of "none" to the linker to suppress a warning about the >> build id being ignored: >> >> /usr/bin/ld: warning: .note.gnu.build-id section discarded, --build-id >> ignored. > > Do we have a good grasp on why this is producing a warning in the first > place? This seems like something that could get merged quickly with one > more sentence in the changelog. >
How about a new changelog as below:
The enclave binary (test_encl.elf) is built with only three sections (tcs, text, and data) as controlled by its custom linker script.
If gcc is built with "--enable-linker-build-id" (this appears to be a common configuration even if it is by default off) then gcc will pass "--build-id" to the linker that will prompt it (the linker) to to write unique bits identifying the linked file to a ".note.gnu.build-id" section.
The section ".note.gnu.build-id" does not exist in the test enclave resulting in the following warning emitted by the linker:
/usr/bin/ld: warning: .note.gnu.build-id section discarded, --build-id ignored
The test enclave does not use the build id within the binary so fix the warning by passing a build id of "none" to the linker that will disable the setting from any earlier "--build-id" options and thus disable the attempt to write the build id to a ".note.gnu.build-id" section that does not exist.
Reinette
| |