ldc-developers/ldc v1.19.0

LDC 1.19.0

on GitHub

(Changes since 1.19.0-beta2 are marked with (new).)

Big news

• Frontend, druntime and Phobos are at version 2.089.1+. (#3192, #3210, #3215, #3232, #3242, #3255, #3261) (new)
• LLVM for prebuilt packages upgraded to v9.0.1; our fork has moved to ldc-developers/llvm-project. The x86[_64] packages newly include the experimental AVR backend. (#3244) (new)
• Android: A prebuilt AArch64 package has been added. It also includes prebuilt druntime/Phobos libraries for x86_64; the armv7a package includes the i686 libraries. So all 4 Android targets are covered with prebuilt druntime/Phobos. (#3244) (new)
• Breaking extern(D) ABI change for Posix x86[_64]: non-POD arguments are now passed by ref under the hood, just like they already were for extern(C++). Some superfluous implicit blits have been optimized away as well, for all targets. (#3204)
• Posix: Defaults to cc now for linking, not gcc (or clang for FreeBSD 10+) - if the CC environment variable isn't set. Override with -gcc=<gcc|clang>. (#3202)
• Codegen elision of dead branches for if statements with constant condition (not depending on enabled LLVM optimizations). (#3134)
• druntime: New llvm_sideeffect intrinsic, new @cold function UDA and extended CAS functionality in core.atomic (incl. support for weak CAS and separate failure ordering). (ldc-developers/druntime#166, ldc-developers/druntime#167, #3220)
• Windows: Bundled MinGW-based libs have been upgraded to use the .def files from MinGW-w64 v7.0.0. They now also contain a default DllMain entry point as well as _[v]snprintf. (libs, #3142)

Platform support

• Supports LLVM 3.9 - 9.0.

Bug fixes

• Misc. CMake issues with some LLVM 9 configurations. (#3079, #3198)
• Equality/identity comparisons of vectors with length ≥ 32. (#3208, #3209)
• ldc.gccbuiltins_* druntime modules now available to non-installed compiler too. (#3194, #3201)
• Potential ICE when applying @assumeUsed on global union. (#3221, #3222)
• Context from outer function, but no outer function? regression introduced in v1.11 (inability to access outer context from extern(C++) methods). (#3234, #3235)
• Lvalue expressions with nested temporaries to be destructed yielding a wrong lvalue. (#3233)
• druntime: Cherry-picked fix wrt. GC potentially collecting objects still referenced in other threads' TLS area. (dlang/druntime#2558) (new)

Known issues

• Buggy older ld.bfd linker versions may wrongly strip out required symbols, e.g., ModuleInfos (so that e.g. no module ctors/dtors are run). LDC defaults to ld.gold on Linux.
• LDC does not zero the padding area of a real variable. This may lead to wrong results if the padding area is also considered. See #770. Does not apply to real members inside structs etc.