Yann Collet 96be2ab78d build: mingw _WIN32_WINNT, pthread probe in a private directory, install installs what was built (checkpoint) ...

Prototype, not intended for a PR as is.

- lz4frame.c (Win32) : _WIN32_WINNT raised to 0x0600 (condition variables) when lower,
  instead of only when undefined : <_mingw.h>, included by standard headers, defines it
  to 0x502 on older mingw-w64, where CONDITION_VARIABLE was then undeclared.
  A higher user-defined value is preserved.
- lib/Makefile : the pthread probe runs within a private temporary directory (mktemp -d),
  instead of a fixed have_pthread.c in the source tree : concurrent invocations no longer
  collide (35 / 320 concurrent probes wrongly reported no threads, producing liblz4.so
  without multi-threading), and read-only source trees are supported.
  The build message mentions "(threads not detected)" when the probe fails.
- make install, as zstd : installs the libraries already built (lib, lib-mt, lib-nomt),
  and only builds them, with current settings, when absent :
  `make lib-mt && make install` now installs the multi-threaded libraries.
  liblz4.pc declares -pthread (Libs.private) when the installed liblz4.a requires it,
  deduced from its symbols (nm) ; when they can't be listed, whenever threads are available.
  Root Makefile : install is ordered after lib goals of the same command line
  (make -j all install, make -j lib-mt install), instead of always rebuilding lib.
- lib/README.md documents it.

Validated : full tests MT / no-MT, ASAN+UBSAN, TSAN, make test, wine, build policies,
Windows DLL through lib/Makefile (imports CreateThread), mingw with _WIN32_WINNT=0x0502,
10 install scenarios + test_install.sh, concurrent and read-only probes.

2026-10-22 04:26:50 -07:00

8.5 KiB

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