[all-commits] [llvm/llvm-project] 7a4c85: [cmake] FindLibXml2: fall back to xmlversion.h whe...

[Sampath Vutkoori via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 7a4c856d55d7b0e7f546cf12fb9b065af46762e7
      https://github.com/llvm/llvm-project/commit/7a4c856d55d7b0e7f546cf12fb9b065af46762e7
  Author: Sampath Vutkoori <svutkoor at qti.qualcomm.com>
  Date:   2026-07-08 (Wed, 08 Jul 2026)

  Changed paths:
    M llvm/cmake/modules/FindLibXml2.cmake

  Log Message:
  -----------
  [cmake] FindLibXml2: fall back to xmlversion.h when pkg-config has no… (#207797)

… version

LLVM's cmake/modules/FindLibXml2.cmake uses PC_LIBXML_VERSION (from
pkg-config) as the VERSION_VAR in find_package_handle_standard_args.
When pkg-config has no libxml-2.0.pc file (e.g. when linking against a
static libxml2-pic.a that ships no .pc file), PC_LIBXML_VERSION is left
empty after pkg_check_modules fails and the >=2.8 version check reports
'Found unsuitable version ""', causing LLDB_ENABLE_LIBXML2 to be set to
FALSE.

Fix: before calling find_package_handle_standard_args, check whether
PC_LIBXML_VERSION is still empty and if so read LIBXML_DOTTED_VERSION
from the xmlversion.h header. This mirrors the version-detection logic
in the system CMake FindLibXml2 module and ensures LLDB is built with
libxml2 support on installations that use a static libxml2 without a .pc
file.



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