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Author SHA1 Message Date
Sam Clegg 3c45a06f26 [lld][WebAssembly] Allow exporting of mutable globals 
In particular allow explict exporting of `__stack_pointer` but
exclud this from `--export-all` to avoid requiring the mutable
globals feature whenenve `--export-all` is used.

This uncovered a bug in populateTargetFeatures regarding checking
if the mutable-globals feature is allowed.

See: https://github.com/WebAssembly/binaryen/issues/2934

Differential Revision: https://reviews.llvm.org/D88506
 2020-09-30 17:53:27 -07:00
Sam Clegg 2c12b056be [lld][WebAssembly] Allow globals imports via import_name/import_module 
This feature already exists but was limited to function
symbols.

Differential Revision: https://reviews.llvm.org/D87666
 2020-09-14 20:35:03 -07:00
Sam Clegg 04febd30a8 [lld][WebAssembly] Error on import/export of mutable global without `mutable-globals` feature 
Also add the +mutable-globals features in clang when
building with `-fPIC` since the linker will generate mutable
globals imports and exports in that case.

Differential Revision: https://reviews.llvm.org/D87537
 2020-09-12 14:28:14 -07:00