emscripten-core/emscripten 7.0.0

on GitHub

What's Changed

• Remove support for the EMCC_ONLY_FORCED_STDLIBS environment variable, which
  was deprecated in 2.0.14 (#13448). Use -nostdlib instead to avoid linking
  standard libraries. (#28151)
• libclang_rt.builtins and libclang_rt.profile are now linked directly into
  all side modules, matching upstream clang behaviour. This means they are
  no longer exported from the main module, reducing MAIN_MODULE=1 code size.
  A new system library, libemcc, now exists for the emscripten-specific code
  that was previously included in libclang_rt.builtins but requires a single
  program-wide definition. If you build with -nostdlib, and explictly list
  system libraries you would now need to include -lemcc. (#28142)
• Split libclang_rt.profile out of libclang_rt.builtins so that it is only
  linked when profiling or coverage flags (such as -fprofile-instr-generate or
  --coverage) are enabled, avoiding unwanted default.profraw output at exit
  in MAIN_MODULE=1 builds. (#28123)
• Pipes now have a 64 KiB capacity: non-blocking writes to a full pipe fail
  with EAGAIN. For now, blocking writes remain unbounded. (#27831)
• When compiling and linking in a single command, auxiliary compiler output
  files (such as .dwo files from -gsplit-dwarf or .json files from
  -ftime-trace) are now named <output>-<input>.<ext>, matching the behavior
  of clang. Previously, .dwo files were named <input>.dwo and other
  auxiliary files were written to the temporary directory. (#28045)
• libcxx, libcxxabi, libunwind and compiler-rt were updated to LLVM 23.1.3.
  Note that libc++ 23 removes many transitive header includes by default, which
  may cause build errors in code that relies on them. As a temporary workaround,
  you can define -D_LIBCPP_KEEP_TRANSITIVE_INCLUDES_LLVM23 until missing
  #include directives are added. See the libc++ 23 release notes for details:
  https://libcxx.llvm.org/ReleaseNotes/23.html#potentially-breaking-changes
  (#28011, #28014, #28108, #28149)
• The WasmFS OPFS backend now uses readwrite-unsafe access handles in
  pthreads builds, so unlink and rename fail with EIO on files open
  read-only. (#27937)
• mimalloc was updated to 3.6.1. (#28026, #28068, #28121)
• Restored --whole-archive behaviour when linking with -sSIDE_MODULE=1
  (fixing a regression from 6.0.0 where static archives were no longer included
  in full), while keeping native archive behaviour for -shared. (#28055)
• JavaScript library dependencies on other JavaScript library symbols are now
  detected automatically by the compiler, so __deps is no longer required for
  direct JS-to-JS references (__deps is still supported for dependencies on
  compiled C/C++ symbols or indirect dependencies). (#27995)
• The default minimum browser versions targeted by Emscripten were increased:
  • MIN_CHROME_VERSION: 85 (Aug 2020) -> 93 (Aug 2021)
  • MIN_FIREFOX_VERSION: 79 (Jul 2020) -> 92 (Sep 2021)
  • MIN_SAFARI_VERSION: 15.0 (Sep 2021) -> 15.4 (Mar 2022)
    (#28141)

Contributors

Thanks to the following contributors: @sbc100 (70) @aheejin (7) @kleisauke (7) @clementperon (4) @guybedford (4) @dschuff (2) @JulesPatmanidis (2) @rustyconover (2) @tlively (2) @ypujante (2) @arsnyder16 (1) @basvandijk (1) @brendandahl (1) @dimokol (1) @Grantim (1) @hoodmane (1) @JesusFileto (1) @kripken (1) @lyrixx (1) @piandtheradians-glitch (1) @Project516 (1) @RagedPanda (1) @stephenduong1004 (1) @subhaushsingh (1) @Thanatos9404 (1) @trackoor (1)

New Contributors

• @rustyconover made their first contribution in #28002
• @JesusFileto made their first contribution in #28033
• @RagedPanda made their first contribution in #28070
• @piandtheradians-glitch made their first contribution in #28066
• @Project516 made their first contribution in #28110
• @lyrixx made their first contribution in #28135
• @basvandijk made their first contribution in #28125
• @Thanatos9404 made their first contribution in #28177
• @trackoor made their first contribution in #28170

Full Changelog: 6.0.13...7.0.0