[PATCH v4 00/30] tools build: Append -fzero-init-padding-bits=all option

[Leo Yan]

Thank you for reviewing v3 and I appreciate much Ian's suggestions, most
of which have been adopted into this series.

For anyone new to the series, the reason for appending this compiler
option is described in v3 (see "Link to v3" below).

In this version, the changes are organized into three parts:

  Patches 01 – 07: Preparation before adding the new compiler option.
                   Fix typos, adjust Makefiles to ensure the newly
                   introduced option does not cause regressions.
  Patch 08:        Propagate -fzero-init-padding-bits=all to
                   EXTRA_CFLAGS and HOST_EXTRACFLAGS for the
                   CC and HOSTCC compilers, respectively.
  Patches 09 – 30: Apply EXTRA_CFLAGS and HOST_EXTRACFLAGS in
                   project Makefiles.

The change has been verified:

Test 1: Cross compiling perf
	host: gcc 15.2.0 (x86_64), target: aarch64-linux-gnu-gcc

  make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- LDFLAGS="-static" \
	    -C tools/perf VF=1 CORESIGHT=1 NO_JEVENTS=1 DEBUG=1

Test 2: Cross compiling selftest bpf and sched_ext
	host: gcc 15.2.0 (x86_64), target: aarch64-linux-gnu-gcc

  export ARCH=arm64
  export CROSS_COMPILE=aarch64-linux-gnu-
  make -C tools/testing/selftests/ TARGETS="bpf sched_ext" SKIP_TARGETS=""

Test 3: Native compiling selftest bpf and sched_ext
	host: gcc 15.2.0 (x86_64)

  make -C tools/testing/selftests/ TARGETS="bpf sched_ext" SKIP_TARGETS=""

Signed-off-by: Leo Yan <leo.yan@xxxxxxx>
---
Changes in v4:
- Placed EXTRA_CFLAGS last so it can override the default options (Ian).
- Cached evaluated values to avoid invoking cc-option when each
  reference EXTRA_CFLAGS/HOST_EXTRACFLAGS (Ian).
- Dropped useless patches for feature, verification and nolibc
  (Gabriele / Ian / Thomas).
- Fixed typos for thermal (Ian).
- Removed duplicate $(CLANG_CROSS_FLAGS) in libbpf (Ian).
- Collected maintainers' reviewed and ACK tags.
- Link to v3: https://lore.kernel.org/r/20260308-tools_build_fix_zero_init-v3-0-6477808123b7@xxxxxxx

Changes in v3:
- Extended to support cross compilation (Quentin).
- Link to v2: https://lore.kernel.org/r/20260224-tools_build_fix_zero_init-v2-1-b1acc817a01e@xxxxxxx

---
Leo Yan (30):
      tools: lib: thermal: Fix typo
      tools/thermal: Fix typo
      tools: lib: thermal: Initialize CFLAGS before including Makefile.include
      tools/thermal: Initialize CFLAGS before including Makefile.include
      bpftool: Avoid adding EXTRA_CFLAGS to HOST_CFLAGS
      libbpf: Remove duplicate $(CLANG_CROSS_FLAGS)
      libbpf: Initialize CFLAGS before including Makefile.include
      tools build: Append -fzero-init-padding-bits=all to extra cflags
      bpftool: Append extra host flags
      perf build: Append extra host flags
      tools/bpf: build: Append extra cflags
      tools build: Append extra host cflags
      tools: bootconfig: Append extra cflags
      tools: counter: Append extra cflags
      tools: dma: Append extra cflags
      tools: gpio: Append extra cflags
      tools: hv: Append extra cflags
      tools: iio: Append extra cflags
      tools: mm: Append extra cflags
      tools: objtool: Append extra host cflags
      tools: power: acpi: Append extra cflags
      tools: power: x86/intel-speed-select: Append extra cflags
      tools: sched_ext: Append extra cflags
      tools: spi: Append extra cflags
      tools: tracing: Append extra cflags
      tools: usb: Append extra cflags
      selftests/bpf: Append extra cflags
      selftests/hid: Append extra cflags
      selftests/nolibc: Append extra cflags
      selftests/sched_ext: Append extra cflags

 tools/bootconfig/Makefile                   |  1 +
 tools/bpf/Makefile                          |  1 +
 tools/bpf/bpftool/Makefile                  |  9 +++++++--
 tools/build/Makefile                        |  6 ++++--
 tools/counter/Makefile                      |  1 +
 tools/dma/Makefile                          |  1 +
 tools/gpio/Makefile                         |  1 +
 tools/hv/Makefile                           |  1 +
 tools/iio/Makefile                          |  1 +
 tools/lib/bpf/Makefile                      | 17 ++++++++--------
 tools/lib/thermal/Makefile                  | 20 ++++++++++---------
 tools/mm/Makefile                           |  1 +
 tools/objtool/Makefile                      |  2 ++
 tools/perf/Makefile.config                  |  2 +-
 tools/power/acpi/Makefile.config            |  1 +
 tools/power/x86/intel-speed-select/Makefile |  1 +
 tools/sched_ext/Makefile                    |  1 +
 tools/scripts/Makefile.include              | 30 +++++++++++++++++++++++++++++
 tools/spi/Makefile                          |  1 +
 tools/testing/selftests/bpf/Makefile        | 10 ++++++++--
 tools/testing/selftests/hid/Makefile        |  1 +
 tools/testing/selftests/nolibc/Makefile     |  6 ++----
 tools/testing/selftests/sched_ext/Makefile  |  1 +
 tools/thermal/lib/Makefile                  | 20 ++++++++++---------
 tools/tracing/latency/Makefile              |  1 +
 tools/usb/Makefile                          |  1 +
 26 files changed, 101 insertions(+), 37 deletions(-)
---
base-commit: 4ae12d8bd9a830799db335ee661d6cbc6597f838
change-id: 20260224-tools_build_fix_zero_init-dc5261bd8b8b

Best regards,
-- 
Leo Yan <leo.yan@xxxxxxx>