Runtime system:

• #9344, #9368: Disable exception backtraces in bytecode programs built with "-output-complete-exe". At the moment, such programs do not embed debug information and exception backtraces where causing them to crash. (Jérémie Dimino, review by Nicolás Ojeda Bär)

Build system:

• #9531: fix support for the BFD library on FreeBSD (Hannes Mehnert, review by Gabriel Scherer and David Allsopp)

Bug fixes:

• #9068, #9437: ocamlopt -output-complete-obj failure on FreeBSD 12 (Xavier Leroy, report by Hannes Mehnert, review by Sébastien Hinderer)

• #9165, #9840: Add missing -function-sections flag in Makefiles. (Greta Yorsh, review by David Allsopp)

• #9495: fix a bug where bytecode binaries compiled with -output-complete-exe would not execute at_exit hooks at program termination (in particular, output channels would not be flushed). (Nicolás Ojeda Bär, review by David Allsopp)

• #9714, #9724: Use the C++ alignas keyword when compiling in C++ in MSVC. Fixes a bug with MSVC C++ 2015 onwards. (Antonin Décimo, review by David Allsopp and Xavier Leroy)

• #9736, #9749: Compaction must start in a heap where all free blocks are blue, which was not the case with the best-fit allocator. (Damien Doligez, report and review by Leo White)

Tools:

• #9552: restore ocamloptp build and installation (Florian Angeletti, review by David Allsopp and Xavier Leroy)