- Support dwz alternate files
- Regression tests: from 6 in v1.31 to 74
- New coverage work, 16 csets

DWARF loader:

- Support DW_FORM_GNU_ref_alt references to dwz alternate debug files
- Add cu parameter to tag__set_spec() and dwarf_tag__set_attr_type()
- Fix cus__merging_cu failing to detect DW_FORM_ref_addr
- Support DW_TAG_imported_unit for same-file partial units
- Allow forcing the merge of CUs for solving inter CU tag references
- Initial support for DW_TAG_subprogram in DW_TAG_enumeration
- Initial support for DW_TAG_variant_part
- Replace stale FIXME/XXX comments with explanations
- Fix data race in tag__init() decl_file string cache
- Skip libdw__lock when elfutils is built thread-safe
- Fix --fixup_silly_bitfields condition check
- Fix annotation failure leaks in variable and typedef creation
- Allocate type_dcu via dwarf_cu__new to fix dangling stack pointer
- Analyze per-parameter information for true signatures
- Collect per-parameter information
- Detect aggregate ABI register usage and signature changes
- Add support for DW_TAG_GNU_annotation
- Extract die__add_btf_type_tag() helper [NFC]
- Detect reordered parameters
- Handle DW_AT_location attrs containing DW_OP_plus_uconst

BTF loader:

- Fix multi-dimensional array loading
- Handle decl tag component_idx for parameters
- Fix warnings due to type permutation

BTF encoder:

- Fix multi-dimensional array encoding
- Fall back to objcopy when llvm-objcopy is not available
- Add elf_strptr NULL checks and fix kfunc bounds
- Fix early cleanup crashes in btf_encoder__new/delete
- Use btf_encoder__tag_type() for all type ID computations
- Fix interior pointer free and missing NULL check
- Ensure the first same-name function has a non-zero address
- Add O_TRUNC to btf_encoder__write_raw_file()
- Only skip optimized parms when ABI changed
- Emit true function signatures
- Prefer strong function definitions for BTF generation
- Add true_signature feature support for "."-suffixed functions
- Fix a verbose output issue
- Factor out BPF kfunc emission
- Refactor btf_encoder__add_func_proto
- Remove encoder pointer from btf_encoder_func_state

pahole:

- Fix -C -T segfault
- Fix option name in the -m/-C error message
- Apply the struct-only filters to unions
- Don't match unions with --with_flexible_array
- Fix --unions --packable segfault
- Guard pipe_seek() against negative offsets
- Use fseek for seekable files in --prettify and --seek_bytes
- Skip inline expansions during BTF encoding
- Fix parse_btf_features("all") being a silent no-op
- Fix --errno typo that decrements instead of negating
- Fix instance memory leak on early returns in
  prototype__stdio_fprintf_value
- Fix BTF function parameter type match check
- Add "layout" BTF encoding feature
- Fix discarded-qualifiers for strchr/strstr.
- Refactor selftests

Regression tests:

- Add pfunct split BTF test to btf_split
- Verify the downloaded perf tarball checksum before extracting
- Use a portable high-resolution timestamp
- Build the test_bin fixture in the per-test tmpdir
- Use POSIX [ instead of [[ in test_lib.sh
- btf_type_tag_order.sh: Use gawk for capture-group match()
- Fix coverage build by respecting build-coverage/ in PATH
- Add automatic perf building for cross-distro compatibility
- Check minimum perf metadata records instead of exact counts
- Fix perf tests for container environments
- Force DWARF 5 in atomic_types test for _Atomic support
- Skip tests gracefully on old bpftool versions
- Skip instead of fail when old toolchains lack feature support
- Fix gcc_true_signatures.sh compiler detection and awk syntax
- Add prototype expression parsing and prettify test
- Add codiff_multi_cu.sh to cover __cus__find_cu_by_name
- Add BTF vmlinux encoding test
- Add typedef chain display test
- Add _Atomic type compile emission test
- Add pahole scattered option paths coverage test
- Add pahole --header_type, --range and --seek_bytes prettify test
- Add codiff member type change and function prototype diff test
- Add dwarf_loader.c bitfield recode and inlining edge case test
- Add dwarves.c core API coverage test
- Add prefcnt type reference counting coverage test
- Add elf_symtab, gobuffer, dutil and pglobal coverage test
- Add dwarves_emit and dwarves_reorganize coverage test
- Add bitfield, cross-boundary and mixed member type test
- Add BTF encoder coverage test for vars, floats and multi-CU
- Add codiff terse, verbose and multi-CU diff test
- Add pfunct CLI option coverage
- Add pglobal variable and function listing test
- Add multi-file loading test
- Add 5 btf_encoder.c targeted coverage tests
- Add medium-effort coverage tests for 5 uncovered code paths
- Add CLI display, BTF encoding options and auxiliary tools tests
- Add enumerator search test, in 2 csets
- Add type containment and pointer search test, in 2 csets
- Add coverage-diff.sh workflow and coverage_table.py reporter
- Add LLVM source-based code coverage support
- Add split BTF encoding test (vmlinux base + kernel module)
- Add BTF_KIND_FWD encoding and loading round-trip test
- Add BTF bitfield encoding/loading round-trip test
- Add BTF FLOAT and ENUM64 type encoding tests
- Add BTF VAR and DATASEC encoding test
- Add expand_pointers, pfunct_stats and class_list_file tests
- Add BTF arena type tag encoding test
- Add pdwtags DWARF tag display test
- Add codiff struct comparison test
- Add bitfield layout and data member filtering test
- Add sort output and separator test
- Add display format options test
- Add class name filtering test
- Add compilable output and type filtering test
- Add type expansion and anonymous struct test
- Add sizes and holes display test
- Fix mktemp suffix portability for Alpine Linux
- Add emit_atomic.sh test and fix pfunct-btf-decl-tags.sh quoting
- Reduce reproducible_build thread count iterations
- Add --dump-artifacts to capture DWARF/BTF from binaries
- Add --jobs/-j option to limit parallel test execution
- Show referenced log file contents in verbose mode
- Add --verbose/-v option for better failure diagnosis
- Add PERF_BIN support and preserve build logs on failure
- Add test number filtering and waiting status line
- Add dynamic test timing and reordering to avoid slow tests blocking
  results
- Add --vmlinux option to specify vmlinux file for tests
- Run test scripts in parallel
- Fix test_lib.sh and test scripts to run from any directory
- Guard cleanup() against empty outdir to prevent rm /*
- Add BTF_FUNCTIONS_QUICK mode for fast CI iteration
- Skip and find vmlinux tests when the running kernel vmlinux is not
  available
- Add inter-CU type reference comparison test
- Add GCC default-BTF optimized parameter coverage
- Add BTF true_signature encoding tests
- Add btf_type_tag ordering test
- Support GCC in pfunct-btf-decl-tags test
- add gcc true signature test

Build:

- Automate the steps needed to release a new version
- Add build-check-series.sh for bisectability verification
- Add tarball targets similar to kernel's perf-tar-src-pkg
- Add git SHA tracking via --devel_version option
- Add test, coverage and list-targets make targets
- Warn loudly when coverage instrumentation is enabled
- Add vmlinux_comparison.py for DWARF/BTF analysis
- Update minimum required version from 3.5 to 3.10

Library:

- Remove 11 dead functions found via coverage analysis, in 2 csets
- Add exec_objcopy() shell-injection-safe helper
- Fix variable shadowing in __cus__find_struct_by_name()
- Fix heap buffer overflow in languages__parse realloc
- Don't search for holes before member byte sizes are cached
- Fix missing list head initialization in type__clone_members
- libbpf sync with 1.8
- Fix NULL dereference in remove_dyn()

Man pages:

- Improve language and formatting
- Fix incorrect command line argument in documentation
- describe layout BTF feature
- document true_signature btf_feature

CI:

- Update LLVM version to 22
- Add clang+aarch64 to matrix
- build/install bpftool from kernel tree
- Support building kernel with LLVM

pfunct:

- Add man page
- Add support for split BTF
- Mark file-local functions as static

Other:

- build-and-test-cmd.sh: Move build-dir detection to test_lib.sh, fix
  container PATH
- build-and-test-cmd.sh: Add CI build+test script
- Fix -Wsign-compare warnings across the codebase

btfdiff:

- Remove leftover comment about --flat_arrays usage
- Remove --flat_arrays now that pahole encodes multi dim arrays in BTF

CTF loader:

- Fix error path resource leaks

scncopy:

- Fix error handling when opening file

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>