Thanks to a recent binutils change which doesn't generate unused
symbols, it's now possible for thunk_64.o be completely empty with
CONFIG_PREEMPTION: no text, no data, no symbols.
We could edit the Makefile to only build that file when
CONFIG_PREEMPTION is enabled, but that will likely create confusion
if/when the thunks end up getting used by some other code again.
Just ignore it and move on.
Reported-by: Nathan Chancellor <natechancel...@gmail.com>
Signed-off-by: Josh Poimboeuf <jpoim...@redhat.com>
---
tools/objtool/elf.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/tools/objtool/elf.c b/tools/objtool/elf.c
index be89c741ba9a..2b0f4f52f7b5 100644
--- a/tools/objtool/elf.c
+++ b/tools/objtool/elf.c
@@ -380,8 +380,11 @@ static int read_symbols(struct elf *elf)
symtab = find_section_by_name(elf, ".symtab");
if (!symtab) {
- WARN("missing symbol table");
- return -1;
+ /*
+ * A missing symbol table is actually possible if it's an empty
+ * .o file. This can happen for thunk_64.o.
+ */
+ return 0;
}
symtab_shndx = find_section_by_name(elf, ".symtab_shndx");
--
2.29.2
