Commits on Feb 28, 2022

1. Fix ldc-developers#3916 - undefined symbols with -dllimport=all on Wi… …

   …ndows
   
   Instantiated data symbols were previously never dllimported with
   `-dllimport=all`. So if the parent template instance wasn't
   codegen'd into the binary directly, it remained undefined.
   
   For `-dllimport=defaultLibsOnly`, the 'solution' to this problem
   was to define-on-declare data symbols instantiated from druntime/
   Phobos templates, making sure each binary defines all such symbols
   it references.
   
   In both cases, switch to an approach where we dllimport all
   instantiated data symbols (or druntime/Phobos symbols only), and
   dllexport them whenever defining them (so that other object files
   or binaries can import them). This may lead to more 'importing
   locally defined symbol' linker warnings, but may also lead to less
   duplicates and possibly 'proper' sharing of instantiated globals
   across the whole process.
   
   This is superfluous and skipped with `-linkonce-templates`, as
   that mode defines all referenced instantiated symbols in each
   binary anyway, and so has already been a workaround.

   

   kinke committed Feb 28, 2022
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