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>
diff --git a/init/Kconfig b/init/Kconfig
index 188dde6..fdf4957 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -2308,6 +2308,7 @@
config UNUSED_KSYMS_WHITELIST
string "Whitelist of symbols to keep in ksymtab"
depends on TRIM_UNUSED_KSYMS
+ default "scripts/lto-used-symbols.txt" if LTO_CLANG
help
By default, all unused exported symbols will be un-exported from the
build when TRIM_UNUSED_KSYMS is selected.
diff --git a/scripts/lto-used-symbols.txt b/scripts/lto-used-symbols.txt
new file mode 100644
index 0000000..38e7bb9
--- /dev/null
+++ b/scripts/lto-used-symbols.txt
@@ -0,0 +1,5 @@
+memcpy
+memmove
+memset
+__stack_chk_fail
+__stack_chk_guard