[PATCH v3 0/8] tools: fix compilation failure caused by init_disassemble_info API changes

[Andres Freund]

binutils changed the signature of init_disassemble_info(), which now causes
compilation failures for tools/{perf,bpf} on e.g. debian unstable. Relevant
binutils commit:
https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=60a3da00bd5407f07

I first fixed this without introducing the compat header, as suggested by
Quentin, but I thought the amount of repeated boilerplate was a bit too
much. So instead I introduced a compat header to wrap the API changes. Even
tools/bpf/bpftool/jit_disasm.c, which needs its own callbacks for json, imo
looks nicer this way.

I'm not regular contributor, so it very well might be my procedures are a
bit off...

I am not sure I added the right [number of] people to CC?

WRT the feature test: Not sure what the point of the -DPACKAGE='"perf"' is,
nor why tools/perf/Makefile.config sets some LDFLAGS/CFLAGS that are also
in feature/Makefile and why -ldl isn't needed in the other places. But...

V2:
- split patches further, so that tools/bpf and tools/perf part are entirely
  separate
- included a bit more information about tests I did in commit messages
- add a maybe_unused to fprintf_json_styled's style argument

V3:
- don't include dis-asm-compat.h when building without libbfd
  (Ben Hutchings)
- don't include compiler.h in dis-asm-compat.h, use (void) casts instead,
  to avoid compiler.h include due to potential licensing conflict
- dual-license dis-asm-compat.h, for better compatibility with the rest of
  bpftool's code (suggested by Quentin Monnet)
- don't display feature-disassembler-init-styled test
  (suggested by Jiri Olsa)
- don't display feature-disassembler-four-args test, I split this for the
  different subsystems, but maybe that's overkill? (suggested by Jiri Olsa)

Cc: Alexei Starovoitov <ast@xxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Sedat Dilek <sedat.dilek@xxxxxxxxx>
Cc: Quentin Monnet <quentin@xxxxxxxxxxxxx>
CC: Ben Hutchings <benh@xxxxxxxxxx>
Cc: bpf@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/lkml/20220622181918.ykrs5rsnmx3og4sv@xxxxxxxxxxxxxxxxx
Link: https://lore.kernel.org/lkml/CA+icZUVpr8ZeOKCj4zMMqbFT013KJz2T1csvXg+VSkdvJH1Ubw@xxxxxxxxxxxxxx

Andres Freund (8):
  tools build: Add feature test for init_disassemble_info API changes
  tools build: Don't display disassembler-four-args feature test
  tools include: add dis-asm-compat.h to handle version differences
  tools perf: Fix compilation error with new binutils
  tools bpf_jit_disasm: Fix compilation error with new binutils
  tools bpf_jit_disasm: Don't display disassembler-four-args feature
    test
  tools bpftool: Fix compilation error with new binutils
  tools bpftool: Don't display disassembler-four-args feature test

 tools/bpf/Makefile                            |  7 ++-
 tools/bpf/bpf_jit_disasm.c                    |  5 +-
 tools/bpf/bpftool/Makefile                    |  8 ++-
 tools/bpf/bpftool/jit_disasm.c                | 42 +++++++++++---
 tools/build/Makefile.feature                  |  4 +-
 tools/build/feature/Makefile                  |  4 ++
 tools/build/feature/test-all.c                |  4 ++
 .../feature/test-disassembler-init-styled.c   | 13 +++++
 tools/include/tools/dis-asm-compat.h          | 55 +++++++++++++++++++
 tools/perf/Makefile.config                    |  8 +++
 tools/perf/util/annotate.c                    |  7 ++-
 11 files changed, 138 insertions(+), 19 deletions(-)
 create mode 100644 tools/build/feature/test-disassembler-init-styled.c
 create mode 100644 tools/include/tools/dis-asm-compat.h

-- 
2.37.0.3.g30cc8d0f14