Summary

• Adds Haiku platform support: build, CI workflow, and fixes across dynlink, portability, threading, build scripts, CMake, and tests

Changes

Build system

• tools/metacall-environment.sh + tools/metacall-configure.sh — added Haiku OS detection using uname -s and the Haiku dependency install step via pkgman:

  cmake
  git
  make
  wget
  getconf
  gcc_syslibs_devel
  

• cmake/CompileOptions.cmake — include the beos OS family in the Unix/macOS compile-options branch so Haiku gets the same hardening/flags treatment

• cmake/Portability.cmake — removed/commented out the old _GENERATE_EXPORT_HEADER workaround that forced WIN32=1 on Haiku; modern CMake export headers work on Haiku without it

Platform #if coverage — Haiku added to existing platform guards

• source/format/include/format/format_specifier.h — Haiku has <unistd.h> / POSIX format macros; without this, format specifiers fell into the unsupported branch

• source/metacall/include/metacall/metacall_fork.h + source/metacall/source/metacall_fork.c — Haiku has POSIX fork() / pid_t, so it joins the Unix fork-safety path. This is what metacall-fork-test exercises, now passing

• source/metacall/source/metacall_link.c — Haiku has <dlfcn.h>, joins the Unix dlsym() hook path

• source/threading/include/threading/threading_mutex.h — Haiku has pthreads; use pthread_mutex like the BSDs

• source/portability/include/portability/portability_path.h — Haiku branch defining PORTABILITY_PATH_SIZE as PATH_MAX with the right headers

• source/portability/include/portability/portability_executable_path.h — Haiku typedef for the path-length type (size_t)

Haiku-native API corrections

• source/threading/source/threading_thread_id.c — two fixes:

  • the header is <kernel/OS.h>, not the BeOS-era <be/kernel/OS.h>
  • the current-thread API is find_thread(NULL); thread_get_current_thread_id() is a private/internal function not in Haiku's public headers

CI (haiku-test.yml)

• New workflow running debug, relwithdebinfo, and release on a Haiku VM via cross-platform-actions

• Configures debug_server with:

  default_action report
  

  On Haiku, a crashing process doesn't die; debug_server suspends it waiting for a debugger, so in headless CI every crash looks like an infinite hang.

  With this setting, crashes terminate immediately and write a crash report with a stack trace, which the workflow dumps into the log.

Missing symbol at load time (portability / metacall CMakeLists)

• dl_iterate_phdr() lives in Haiku's libbsd.so, not libroot

• Haiku's runtime_loader binds all symbols eagerly, so any binary touching the portability code aborted at load with B_MISSING_SYMBOL / exit code 4, with no output

• Linked bsd on Haiku in both the portability library and the MetaCall unity build

dynlink_impl_beos.c — BIND_SELF

• load_add_on() never deduplicates: calling it on the running executable loads a second copy of the image and re-runs all its static constructors, matching BeOS replicant semantics

• Replaced the BIND_SELF path with dlopen(NULL), which on Haiku returns the global scope without loading anything — matching the Unix implementation's semantics

• Symbol lookup branches to dlsym() for the self handle

portability_executable_path.c

• Had no Haiku branch, so *length was returned uninitialized

• This caused an out-of-bounds read in portability_path_get_name() and a segfault in dynlink-test

• Added a branch using get_next_image_info() to find the B_APP_IMAGE path

serial_test.cpp

• Added __HAIKU__ to the expected pointer-format #if

• Haiku's %p prints 0xa7ef2, same as Linux

plthook (plthook_detour/CMakeLists.txt)

• Haiku support for PLT hooking — fixes detour-test and metacall-fork-test

• Currently fetches from my fork: yug105/plthook, branch haiku-support