[ELF] - Depricate version references.
This is PR28358
According to
https://www.akkadia.org/drepper/dsohowto.pdf
"The fourth point, the VERS 1.0 version being referred to in the VERS 2.0 definition, is not really important in symbol versioning. It marks the predecessor relationship of the two versions and it is done to maintain the similar- ities with Solaris’ internal versioning. It does not cause any problem it might in fact be useful to a human reader so predecessors should always be mentioned."
Patch partially reverts 273423 "[ELF] - Implemented version script hierarchies.",
version references are just ignored now.
Differential revision: http://reviews.llvm.org/D21888
llvm-svn: 274345
diff --git a/lld/ELF/SymbolListFile.cpp b/lld/ELF/SymbolListFile.cpp
index f9a12e2..bbf9085 100644
--- a/lld/ELF/SymbolListFile.cpp
+++ b/lld/ELF/SymbolListFile.cpp
@@ -95,8 +95,13 @@
parseVersionSymbols(Version);
expect("}");
+
+ // Each version may have a parent version. For example, "Ver2" defined as
+ // "Ver2 { global: foo; local: *; } Ver1;" has "Ver1" as a parent. This
+ // version hierarchy is, probably against your instinct, purely for human; the
+ // runtime doesn't care about them at all. In LLD, we simply skip the token.
if (!Version.empty() && peek() != ";")
- Config->SymbolVersions.back().Parent = next();
+ next();
expect(";");
}