[PATCH v2] tools/resolve_btfids: Fix build error with older host toolchains

[Kun-Chuan Hsieh <jetswayss@gmail.com>]

Older libelf.h and glibc elf.h might not yet define the ELF compression
types.

Checking and defining SHF_COMPRESSED fix the build error when compiling
with older toolchains. Also, the tool resolve_btfids is compiled with host
toolchain. The host toolchain is more likely to be older than the cross
compile toolchain.

Cc: stable@vger.kernel.org

Signed-off-by: Kun-Chuan Hsieh <jetswayss@gmail.com>
---
 tools/bpf/resolve_btfids/main.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/bpf/resolve_btfids/main.c b/tools/bpf/resolve_btfids/main.c
index 7409d7860aa6..80d966cfcaa1 100644
--- a/tools/bpf/resolve_btfids/main.c
+++ b/tools/bpf/resolve_btfids/main.c
@@ -260,6 +260,11 @@ static struct btf_id *add_symbol(struct rb_root *root, char *name, size_t size)
 	return btf_id__add(root, id, false);
 }
 
+/* Older libelf.h and glibc elf.h might not yet define the ELF compression types. */
+#ifndef SHF_COMPRESSED
+#define SHF_COMPRESSED (1 << 11) /* Section with compressed data. */
+#endif
+
 /*
  * The data of compressed section should be aligned to 4
  * (for 32bit) or 8 (for 64 bit) bytes. The binutils ld
-- 
2.25.1