tree 22abb7f385bd57d1308571c3d16e8fbe0419b090
parent 3dafd644af855246f057cebff67557663dd0e4b9
author Sam Clegg <sbc@chromium.org> 1571289414 +0000
committer Sam Clegg <sbc@chromium.org> 1571289414 +0000

[lld][WebAssebmly] Preserve custom import attributes with LTO

Undefined symbols in WebAssembly can come with custom `import-module`
and `import-field` attributes.  However when reading symbols from
bitcode object files during LTO those curtom attributes are not
available.

Once we compile the LTO object and read in the symbol table from the
object file we have access to these custom attributes.  In this case,
when undefined symbols are added and a symbol already exists in the
SymbolTable we can't simple return it, we may need to update the
symbol's attributes.

Fixes: PR43211

Differential Revision: https://reviews.llvm.org/D68959

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@375081 91177308-0d34-0410-b5e6-96231b3b80d8