tree 3978b5f67eb3e145573af8c5a384c1d7be4ecbe8
parent 76df447444be3b80a96bce07ff539570e9ffdff5
author Sami Tolvanen <samitolvanen@google.com> 1607630318 -0800
committer Sami Tolvanen <samitolvanen@google.com> 1608137793 -0800

FROMLIST: kbuild: lto: add a default list of used symbols

With CONFIG_LTO_CLANG, LLVM bitcode has not yet been compiled into a
binary when the .mod files are generated, which means they don't yet
contain references to certain symbols that will be present in the final
binaries. This includes intrinsic functions, such as memcpy, memmove,
and memset [1], and stack protector symbols [2]. This change adds a
default symbol list to use with CONFIG_TRIM_UNUSED_KSYMS when Clang's
LTO is used.

[1] https://llvm.org/docs/LangRef.html#standard-c-c-library-intrinsics
[2] https://llvm.org/docs/LangRef.html#llvm-stackprotector-intrinsic

Bug: 145210207
Change-Id: I9da92fba820c72633209e292fdc6f1c44abe7b9a
Link: https://lore.kernel.org/lkml/20201211184633.3213045-7-samitolvanen@google.com/
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>