This is to avoid misaligned access when memory-mapping ELF sections.
Signed-off-by: Giuliano Procida <gprocida@xxxxxxxxxx>
---
libbtf.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/libbtf.c b/libbtf.c
index 7552d8e..2f12d53 100644
--- a/libbtf.c
+++ b/libbtf.c
@@ -797,6 +797,14 @@ static int btf_elf__write(const char *filename, struct btf *btf)
goto unlink;
}
+ snprintf(cmd, sizeof(cmd), "%s --set-section-alignment .BTF=16 %s",
+ llvm_objcopy, filename);
+ if (system(cmd)) {
+ /* non-fatal, this is a nice-to-have and it's only supported from LLVM 10 */
+ fprintf(stderr, "%s: warning: failed to align .BTF section in '%s': %d!\n",
+ __func__, filename, errno);
+ }
+
err = 0;
unlink:
unlink(tmp_fn);
--
2.30.0.284.gd98b1dd5eaa7-goog
