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tools/resolve_btfids: Fix build error with older host toolchains 

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: 51f6463aac ("tools/resolve_btfids: Fix sections with wrong alignment")
Signed-off-by: Kun-Chuan Hsieh <jetswayss@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Link: https://lore.kernel.org/bpf/20210224052752.5284-1-jetswayss@gmail.com
This commit is contained in:
Kun-Chuan Hsieh 2021-02-24 05:27:52 +00:00 committed by Daniel Borkmann
parent c41d81bfbb
commit 41462c6e73
1 changed files with 5 additions and 0 deletions
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5
tools/bpf/resolve_btfids/main.c
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@ -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