[PATCH v6 02/29] vmlinux.lds.h: Add .gnu.version* to COMMON_DISCARDS

[Kees Cook]

For vmlinux linking, no architecture uses the .gnu.version* sections,
so remove it via the COMMON_DISCARDS macro in preparation for adding
--orphan-handling=warn more widely. This is a work-around for what
appears to be a bug[1] in ld.bfd which warns for this synthetic section
even when none is found in input objects, and even when no section is
emitted for an output object[2].

[1] https://sourceware.org/bugzilla/show_bug.cgi?id=26153
[2] https://lore.kernel.org/lkml/202006221524.CEB86E036B@keescook/

Reviewed-by: Fangrui Song <maskray@xxxxxxxxxx>
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
---
 include/asm-generic/vmlinux.lds.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index 184b23d62784..f1f02a2f71b7 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -957,7 +957,9 @@
 #define COMMON_DISCARDS							\
 	*(.discard)							\
 	*(.discard.*)							\
-	*(.modinfo)
+	*(.modinfo)							\
+	/* ld.bfd warns about .gnu.version* even when not emitted */	\
+	*(.gnu.version*)						\
 
 #define DISCARDS							\
 	/DISCARD/ : {							\
-- 
2.25.1