Add lld20 into toolchain registry

commit_hash:7b0d771b7f0e5779078cc5c6bd89eb4208b488aa

Author: 4JustMe4

.mapping.json

@@ -53,6 +53,8 @@
   "ynd/bin/lld/18/ix.sh":"toolchains/ynd/bin/lld/18/ix.sh",
   "ynd/bin/lld/18/llvm-issue-61208.diff":"toolchains/ynd/bin/lld/18/llvm-issue-61208.diff",
   "ynd/bin/lld/18/macho-relocation.patch":"toolchains/ynd/bin/lld/18/macho-relocation.patch",
+  "ynd/bin/lld/20/ix.sh":"toolchains/ynd/bin/lld/20/ix.sh",
+  "ynd/bin/lld/20/llvm-issue-61208.diff":"toolchains/ynd/bin/lld/20/llvm-issue-61208.diff",
   "ynd/bin/llvm-profdata/19/ix.sh":"toolchains/ynd/bin/llvm-profdata/19/ix.sh",
   "ynd/bin/llvm-profdata/ix.sh":"toolchains/ynd/bin/llvm-profdata/ix.sh",
   "ynd/bin/yq/ix.sh":"toolchains/ynd/bin/yq/ix.sh",

ynd/bin/lld/20/ix.sh

@@ -0,0 +1,48 @@
+{% extends '//bin/clang/t/t/ix.sh' %}
+
+{% block fetch %}
+{% include '//lib/llvm/20/ver.sh' %}
+{% endblock %}
+
+{% block bld_libs %}
+lib/zstd
+{{super()}}
+{% endblock %}
+
+{% block bld_tool %}
+lib/llvm/20/tblgen
+{% if linux %}
+bin/muslstack
+{% endif %}
+{{super()}}
+{% endblock %}
+
+{% block llvm_targets %}
+lld
+{% endblock %}
+
+{% block patch %}
+base64 -d << EOF | patch -p1
+{% include 'llvm-issue-61208.diff/base64' %}
+EOF
+{% endblock %}
+
+{% block configure %}
+export PYTHON3=$(command -v python3)
+echo ${PYTHON3}
+{{super()}}
+{% endblock %}
+
+{% block cmake_flags %}
+{{super()}}
+LLVM_INCLUDE_BENCHMARKS=OFF
+LLVM_INCLUDE_TESTS=OFF
+Python3_EXECUTABLE=${PYTHON3}
+{% endblock %}
+
+{% block install %}
+{{super()}}
+{% if linux %}
+muslstack -s 8388608 ${out}/bin/lld
+{% endif %}
+{% endblock %}

ynd/bin/lld/20/llvm-issue-61208.diff

@@ -0,0 +1,11 @@
+--- a/lld/ELF/SymbolTable.cpp
++++ b/lld/ELF/SymbolTable.cpp
+@@ -276,7 +276,7 @@ void SymbolTable::scanVersionScript() {
+                                    pat.isExternCpp, /*hasWildCard=*/false},
+                                   id, ver, /*includeNonDefault=*/true);
+       if (!found && !ctx.arg.undefinedVersion)
+-        Err(ctx) << "version script assignment of '" << ver << "' to symbol '"
++        Warn(ctx) << "version script assignment of '" << ver << "' to symbol '"
+                  << pat.name << "' failed: symbol not defined";
+     };
+     for (SymbolVersion &pat : v.nonLocalPatterns)