linux-toradex.git/tools/bpf/resolve_btfids/Makefile, branch master

resolve_btfids: Fix linker flags detection

2026-03-07T16:51:51+00:00

The "|| echo -lzstd" default makes zstd an unconditional link
dependency of resolve_btfids. On systems where libzstd-dev is not
installed and pkg-config fails, the linker fails:

  ld: cannot find -lzstd: No such file or directory

libzstd is a transitive dependency of libelf, so the -lzstd flag is
strictly necessary only for static builds [1].

Remove ZSTD_LIBS variable, and instead set LIBELF_LIBS depending on
whether the build is static or not. Use $(HOSTPKG_CONFIG) as primary
source of the flags list.

Also add a default value for HOSTPKG_CONFIG in case it's not built via
the toplevel Makefile. Pass it from selftests/bpf too.

[1] https://lore.kernel.org/bpf/4ff82800-2daa-4b9f-95a9-6f512859ee70@linux.dev/

Reported-by: BPF CI Bot (Claude Opus 4.6) 
Reported-by: Vitaly Chikunov 
Closes: https://lore.kernel.org/bpf/aaWqMcK-2AQw5dx8@altlinux.org/
Fixes: 4021848a903e ("selftests/bpf: Pass through build flags to bpftool and resolve_btfids")
Signed-off-by: Ihor Solodrai 
Reviewed-by: Paul Chaignon 
Link: https://lore.kernel.org/r/20260305014730.3123382-1-ihor.solodrai@linux.dev
Signed-off-by: Alexei Starovoitov

selftests/bpf: Pass through build flags to bpftool and resolve_btfids

2026-02-24T16:19:49+00:00

EXTRA_* and SAN_* build flags were not correctly propagated to bpftool
and resolve_btids when building selftests/bpf. This led to various
build errors on attempt to build with SAN_CFLAGS="-fsanitize=address",
for example.

Fix the makefiles to address this:
  - Pass SAN_CFLAGS/SAN_LDFLAGS to bpftool and resolve_btfids build
  - Propagate EXTRA_LDFLAGS to resolve_btfids link command
  - Use pkg-config to detect zlib and zstd for resolve_btfids, similar
    libelf handling

Also check for ASAN flag in selftests/bpf/Makefile for convenience.

Signed-off-by: Ihor Solodrai 
Link: https://lore.kernel.org/r/20260223190736.649171-7-ihor.solodrai@linux.dev
Signed-off-by: Alexei Starovoitov

resolve_btfids: Always build with -Wall -Werror

2025-12-19T18:55:40+00:00

resolve_btfids builds without compiler warnings currently, so let's
enforce this for future changes with '-Wall -Werror' flags [1].

[1] https://lore.kernel.org/bpf/1957a60b-6c45-42a7-b525-a6e335a735ff@linux.dev/

Signed-off-by: Ihor Solodrai 
Signed-off-by: Andrii Nakryiko 
Tested-by: Alan Maguire 
Link: https://lore.kernel.org/bpf/20251219181321.1283664-5-ihor.solodrai@linux.dev

tools/resolve_btfids: Fix build when cross compiling kernel with clang.

2025-06-10T16:09:27+00:00

When cross compiling the kernel with clang, we need to override
CLANG_CROSS_FLAGS when preparing the step libraries.

Prior to commit d1d096312176 ("tools: fix annoying "mkdir -p ..." logs
when building tools in parallel"), MAKEFLAGS would have been set to a
value that wouldn't set a value for CLANG_CROSS_FLAGS, hiding the
fact that we weren't properly overriding it.

Fixes: 56a2df7615fa ("tools/resolve_btfids: Compile resolve_btfids as host program")
Signed-off-by: Suleiman Souhlal 
Signed-off-by: Andrii Nakryiko 
Acked-by: Jiri Olsa 
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/bpf/20250606074538.1608546-1-suleiman@google.com

tools: Remove redundant quiet setup

2025-02-18T19:27:43+00:00

Q is exported from Makefile.include so it is not necessary to manually
set it.

Reviewed-by: Jiri Olsa 
Signed-off-by: Charlie Jenkins 
Acked-by: Andrii Nakryiko 
Acked-by: Quentin Monnet 
Cc: Adrian Hunter 
Cc: Alexander Shishkin 
Cc: Alexei Starovoitov 
Cc: Benjamin Tissoires 
Cc: Daniel Borkmann 
Cc: Daniel Lezcano 
Cc: Eduard Zingerman 
Cc: Hao Luo 
Cc: Ian Rogers 
Cc: Ingo Molnar 
Cc: Jiri Kosina 
Cc: John Fastabend 
Cc: Josh Poimboeuf 
Cc: KP Singh 
Cc: Lukasz Luba 
Cc: Mark Rutland 
Cc: Martin KaFai Lau 
Cc: Mykola Lysenko 
Cc: Namhyung Kim 
Cc: Peter Zijlstra 
Cc: Rafael J. Wysocki 
Cc: Shuah Khan 
Cc: Song Liu 
Cc: Stanislav Fomichev 
Cc: Steven Rostedt (VMware) 
Cc: Yonghong Song 
Cc: Zhang Rui 
Link: https://lore.kernel.org/r/20250213-quiet_tools-v3-2-07de4482a581@rivosinc.com
Signed-off-by: Arnaldo Carvalho de Melo

tools/resolve_btfids: Fix setting HOSTCFLAGS

2023-06-05T22:44:47+00:00

Building BPF selftests with custom HOSTCFLAGS yields an error:

    # make HOSTCFLAGS="-O2"
    [...]
      HOSTCC  ./tools/testing/selftests/bpf/tools/build/resolve_btfids/main.o
    main.c:73:10: fatal error: linux/rbtree.h: No such file or directory
       73 | #include 
          |          ^~~~~~~~~~~~~~~~

The reason is that tools/bpf/resolve_btfids/Makefile passes header
include paths by extending HOSTCFLAGS which is overridden by setting
HOSTCFLAGS in the make command (because of Makefile rules [1]).

This patch fixes the above problem by passing the include paths via
`HOSTCFLAGS_resolve_btfids` which is used by tools/build/Build.include
and can be combined with overridding HOSTCFLAGS.

[1] https://www.gnu.org/software/make/manual/html_node/Overriding.html

Fixes: 56a2df7615fa ("tools/resolve_btfids: Compile resolve_btfids as host program")
Signed-off-by: Viktor Malik 
Signed-off-by: Andrii Nakryiko 
Acked-by: Jiri Olsa 
Link: https://lore.kernel.org/bpf/20230530123352.1308488-1-vmalik@redhat.com

tools/resolve_btfids: Pass HOSTCFLAGS as EXTRA_CFLAGS to prepare targets

2023-02-09T19:44:56+00:00

Thorsten reported build issue with command line that defined extra
HOSTCFLAGS that were not passed into 'prepare' targets, but were
used to build resolve_btfids objects.

This results in build fail when these objects are linked together:

  /usr/bin/ld: /build.../tools/bpf/resolve_btfids//libbpf/libbpf.a(libbpf-in.o):
  relocation R_X86_64_32 against `.rodata.str1.1' can not be used when making a PIE \
  object; recompile with -fPIE

Fixing this by passing HOSTCFLAGS in EXTRA_CFLAGS as part of
HOST_OVERRIDES variable for prepare targets.

[1] https://lore.kernel.org/bpf/f7922132-6645-6316-5675-0ece4197bfff@leemhuis.info/

Fixes: 56a2df7615fa ("tools/resolve_btfids: Compile resolve_btfids as host program")
Reported-by: Thorsten Leemhuis 
Signed-off-by: Jiri Olsa 
Signed-off-by: Andrii Nakryiko 
Tested-by: Thorsten Leemhuis 
Acked-by: Ian Rogers 
Link: https://lore.kernel.org/bpf/20230209143735.4112845-1-jolsa@kernel.org

tools/resolve_btfids: Tidy HOST_OVERRIDES

2023-02-07T21:48:56+00:00

Don't set EXTRA_CFLAGS to HOSTCFLAGS, ensure CROSS_COMPILE isn't
passed through.

Signed-off-by: Ian Rogers 
Signed-off-by: Daniel Borkmann 
Acked-by: Jiri Olsa 
Link: https://lore.kernel.org/bpf/20230202224253.40283-1-irogers@google.com

tools/resolve_btfids: Compile resolve_btfids as host program

2023-02-07T21:47:16+00:00

Making resolve_btfids to be compiled as host program so
we can avoid cross compile issues as reported by Nathan.

Also we no longer need HOST_OVERRIDES for BINARY target,
just for 'prepare' targets.

Fixes: 13e07691a16f ("tools/resolve_btfids: Alter how HOSTCC is forced")
Reported-by: Nathan Chancellor 
Signed-off-by: Jiri Olsa 
Signed-off-by: Daniel Borkmann 
Tested-by: Nathan Chancellor 
Acked-by: Ian Rogers 
Link: https://lore.kernel.org/bpf/20230202112839.1131892-1-jolsa@kernel.org

tools/resolve_btfids: Alter how HOSTCC is forced

2023-01-25T17:28:14+00:00

HOSTCC is always wanted when building. Setting CC to HOSTCC happens
after tools/scripts/Makefile.include is included, meaning flags are
set assuming say CC is gcc, but then it can be later set to HOSTCC
which may be clang. tools/scripts/Makefile.include is needed for host
set up and common macros in objtool's Makefile. Rather than override
CC to HOSTCC, just pass CC as HOSTCC to Makefile.build, the libsubcmd
builds and the linkage step. This means the Makefiles don't see things
like CC changing and tool flag determination, and similar, work
properly.

Also, clear the passed subdir as otherwise an outer build may break by
inadvertently passing an inappropriate value.

Signed-off-by: Ian Rogers 
Signed-off-by: Daniel Borkmann 
Acked-by: Jiri Olsa 
Link: https://lore.kernel.org/bpf/20230124064324.672022-2-irogers@google.com