linux-kernel - [PATCH 5.11 078/306] tools/resolve_btfids: Fix build error with older host toolchains

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Message-Id: <20210315135510.275986662@linuxfoundation.org>
Date:   Mon, 15 Mar 2021 14:52:21 +0100
From:   gregkh@...uxfoundation.org
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Kun-Chuan Hsieh <jetswayss@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jiri Olsa <jolsa@...hat.com>
Subject: [PATCH 5.11 078/306] tools/resolve_btfids: Fix build error with older host toolchains

From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

From: Kun-Chuan Hsieh <jetswayss@...il.com>

commit 41462c6e730ca0e63f5fed5a517052385d980c54 upstream.

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.

Fixes: 51f6463aacfb ("tools/resolve_btfids: Fix sections with wrong alignment")
Signed-off-by: Kun-Chuan Hsieh <jetswayss@...il.com>
Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
Acked-by: Jiri Olsa <jolsa@...hat.com>
Link: https://lore.kernel.org/bpf/20210224052752.5284-1-jetswayss@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 tools/bpf/resolve_btfids/main.c |    5 +++++
 1 file changed, 5 insertions(+)

--- 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
 	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