4.9.3

• Updated cxxstd for 23 and 26 versions of recent gcc and clang. (#184)
  -- Andrey Semashev

4.9.2

• Fix too long msvc link actions.
  -- René Ferdinand Rivera Morell

4.9.1

• Fix bad calculation of initial dev-only path to bootstrap file within the
  b2 dev tree.
  -- René Ferdinand Rivera Morell
• Fix bad path calculation in final fallback for loading bootstrap file from
  path specified in boost-build rule.
  -- René Ferdinand Rivera Morell

4.9.0

This release has mostly internal cleanups and restructuring. The most
significant being: fixing all memory leaks, automatic build system
startup with the boost-build rule, the Jam Python interfaces, and
the unmaintained Python build system port.

• Add minimal and debug options for optimization feature.
  -- René Ferdinand Rivera Morell
• Add Rocket Lake, Alder Lake, Sapphire Rapids and Zen 3 instruction sets.
  -- Andrey Semashev
• Remove all, on-exit, memory leaks and fix all ASAN errors.
  -- René Ferdinand Rivera Morell
• Remove use of boost-build.jam as a initialization configuration file.
  -- René Ferdinand Rivera Morell
• Remove the incomplete build system port and Jam engine Python support
  extensions.
  -- René Ferdinand Rivera Morell
• Fix not being able to do combined arm+x86 builds on macOS with darwin
  and clang toolsets.
  -- René Ferdinand Rivera Morell
• Fix not being able to do cross-compiles on macOS with clang toolset.
  -- René Ferdinand Rivera Morell
• Fix errors when collecting a large number of object files with long names
  into a static archive for gcc and clang toolsets.
  -- René Ferdinand Rivera Morell
• Fix detection of QCC in build.sh engine build script.
  -- René Ferdinand Rivera Morell
• Fix missing assembly flags for intel-win toolset.
  -- René Ferdinand Rivera Morell
• Fix possible command line length limit exceeded error with msvc toolset for
  link actions.
  -- René Ferdinand Rivera Morell
• New: Add a "t" mode to FILE_OPEN built-in rule that gives one the
  contents of a file when evaluated.
  -- René Ferdinand Rivera Morell

WARNING: This release removes the use of boost-build.jam and the
boost-build rule for initialization. The boost-build.jam is still
searched for and loaded to not break existing operations. But is considered
deprecated and will be removed in a future release.

4.8.2

• Fix crash on exit cleanup of target lists caused by recursive destruction
  and incorrect target list pop unlinking.
  -- René Ferdinand Rivera Morell

4.8.1

• Fix build of engine on old macOS/XCode versions prior to 9.0 because of
  missing EXIT_SUCCESS and EXIT_FAILURE macros.
  -- René Ferdinand Rivera Morell

4.8.0

This is mostly a bugfix release, but there is also now support for building with the new LoongArch architecture. This release also sees the movement of the b2 engine to using more C++ features to help in reducing memory leaks and cleaner exit semantics.

• New: Add support for LoongArch.
  -- Zhang Na
• Change engine build to use static Intel libs if available instead of C++
  runtime static libs to fix systems where the static C++ runtime is not
  available.
  -- Alain Miniussi
• Reorder msvc cflags and cxxflags, and add compileflags, to fix inability
  to override flags by users.
  -- Peter Dimov
• Don't quote RPATH on clang-linux to fix use of double-quotes to make it
  possible to use $ORIGIN.
  -- Dimitry Andric
• Fix b2 executable detection on kFreeBSD.
  -- Laurent Bigonville
• Add .ipp extension to header scanning and a valid C++ file.
  -- Jim King
• Fix missing install targets when build=no is in source target usage
  requirements.
  -- Dmitry Arkhipov
• Add some future versions of C++ to cxxstd feature.
  -- René Ferdinand Rivera Morell
• Fix many memory leaks in engine.
  -- René Ferdinand Rivera Morell
• Change abort/exit calls to clean exception handling to allow for memory
  cleanup in engine.
  -- René Ferdinand Rivera Morell

4.7.2

• Fix errors configuring intel-linux toolset if icpx is not in the PATH but icpc is in the PATH.
  -- Mark E. Hamilton
• Add cxxstd=20 to msvc toolset now that VS 2019 onward supports it.
  -- Peter Dimov

4.7.1

• Fix regression for linking with clang-win toolset.
  -- Peter Dimov

4.7.0

Many, many fixes and internal cleanups in this release. But also adding
auto-detection and bootstrap for VS 2022 preview toolset.

• New: Add vc143, aka VS2022, aka cl.exe 17.x toolset support. Includes
  building engine and automatic detection of the prerelease toolset.
  -- Sergei Krivonos
• Allow alias targets to continue even if <build>no is in the usage
  requirement. Which allows composition of alias targets that may contain
  optional targets, like tests.
  -- Dmitry Arkhipov
• Fix use of JAMSHELL in gcc toolset.
  -- René Ferdinand Rivera Morell
• Fix compiling b2 enging such that it works when run in cross-architecture
  emulation context. I.e. when running arm binaries in QEMU 64 bit host.
  -- René Ferdinand Rivera Morell
• Default to 64bit MSVC on 64 bit hosts.
  -- Matt Chambers
• Remove /NOENTRY option for resource only DLLs to allow correct linking.
  -- gnaggnoyil
• Fix redefinition error of unix when compiling engine on OpenBSD.
  -- Brad Smith
• Fix building with clang on iOS and AppleTV having extra unrecognized
  compiler options.
  -- Konstantin Ivlev
• Add missing Boost.JSON to boost support module.
  -- Dmitry Arkhipov
• Add arm/arm64 target support in clang-win toolset.
  -- Volo Zyko
• Avoid warnings about threading model for qt5.
  -- psandana
• Unify Clang and GCC PCH creation.
  -- Nikita Kniazev
• Move Objective-C support to GCC toolset.
  -- Nikita Kniazev
• Support values for instruction-set feature for Xilinx ZYNQ.
  -- Thomas Brown
• MIPS: add generic mips architecture.
  -- YunQiang Su
• Fix preprocessing on MSVC compiler.
  -- Nikita Kniazev