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[PATCH]: allow PE executables to have an export table

Current version of ld has a limitation: PE executables generated by ld never
have an export table, although PE shared libraries (DLLs) have one. In fact,
an export table in an executable file is perfectly legitimate (
says: "Executables may of course also have exported symbols but usually
they don't"), and Microsoft's tools cl.exe and link.exe are able to create
.EXE files with an export table.

With this patch, ld puts an export table in the PE executable files it generates,
as long as there is at least one exported function. The behaviour is unchanged
when there are no exported functions, which is the vast
majority of cases. The patch has only been tested with Intel i386 PE files,
no other processors have been tested.

Fabrizio Gennari

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Attachment: ld-patch.txt
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