[PATCHES v2 0/7] perf build: Add target to install devel packages needed to build perf

[Arnaldo Carvalho de Melo]

Hi,

This series adds a 'make -C tools/perf install-build-deps' target that
installs the development packages needed to build perf on Fedora,
Ubuntu, Debian, and RHEL family distributions.

Building perf requires many devel packages (libelf, libdw, libunwind,
numactl, libtraceevent, libbpf, etc.). Today users must iteratively
install packages as each feature check fails. The new target installs
the full set in one go.

The first patch makes the compiler probe run at parse time only when the
tool is installed, so a missing C++ compiler or clang no longer fails
the feature tests prematurely. The second patch adds the framework (make
target, distro detection, package manager drivers). The next four
patches add distro-specific package mappings derived from the headers
each feature test requires. The last patch removes leftover feature test
entries for cxx and clang support removed in 56b11a2126bf2f42 ("perf
bpf: Remove support for embedding clang for compiling BPF events (-e
foo.c)").

Supported distros (validated in containers, host never modified):
  - Fedora 44 (dnf, 29 packages)
  - Ubuntu 26.04 (apt, 29 packages)
  - Debian 13 (apt, reuses Ubuntu mapping)
  - Centos 10 (dnf, 29 packages)

On all distros, a clean O= build after running the target enabled every
feature the distro provides (excluding deliberately unmapped deprecated
packages). Re-running the target is a no-op.

What changed from v1:

  - AlmaLinux is now detected by its actual /etc/os-release ID
    ("almalinux" instead of "alma") in detect_distro() [sashiko review
    of PATCH 7/7];
  - packages that no enabled repo provides (e.g. zlib and the versioned
    JDK/jvmti packages on the RHEL family) are no longer silently
    omitted from the missing packages list, they are reported at the end
    of the run, as stated in the commit message [sashiko review of
    PATCH 7/7];
  - the temporary file used to track those missing packages is now
    removed by a trap, so it does not leak if the script is interrupted
    [sashiko review of PATCH 7/7];
  - the leftover feature test removal patch now carries the suggested
    Fixes: tag for 56b11a2126bf2f42, with the author of that commit
    Cc'd [Ian Rogers review of PATCH 6/7].

This series was developed with assistance from Opencode
(deepseek-v4-flash-free and glm-4-7-flash-ollama-local) for code
analysis, patch generation, and commit message composition.

Regards,

- Arnaldo

Arnaldo Carvalho de Melo (7):
  tools build: Only probe the compiler at parse time when it is installed
  perf build: Add install-build-deps framework to install devel packages
  perf build: install-build-deps: add Fedora devel package mapping
  perf build: install-build-deps: add Ubuntu devel package mapping
  perf build: install-build-deps: add Debian devel package mapping
  perf build: Remove leftover feature tests for removed cxx and clang support
  perf build: install-build-deps: add RHEL family devel package mapping

 tools/build/Makefile.feature               |   2 -
 tools/build/feature/Makefile               |  14 -
 tools/perf/Makefile.perf                   |  21 +-
 tools/perf/scripts/install-build-deps.sh   | 577 +++++++++++++++++++++++++++++++
 tools/scripts/Makefile.arch                |   2 +-
 tools/scripts/Makefile.include             |   2 +-
 6 files changed, 597 insertions(+), 21 deletions(-)

base-commit: bf10e6ee2ac3034c9068e03eed418fd16961984e