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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 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. Link: https://lore.kernel.org/linux-sgx/20191017030340.18301-2-sean.j.christopherson@intel.com/ Suggested-by: Cedric Xing <cedric.xing@intel.com> Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com> Signed-off-by: Reinette Chatre <reinette.chatre@intel.com> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org> Acked-by: Dave Hansen <dave.hansen@linux.intel.com> Link: https://lkml.kernel.org/r/ca0f8a81fc1e78af9bdbc6a88e0f9c37d82e53f2.1636997631.git.reinette.chatre@intel.com |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.