LLVM: Add unified LLD JLL, and add driver entrypoints.

L/LLVM/Clang_unified/build_tarballs.jl

@@ -11,7 +11,9 @@ version = v"0.1"
 llvm_full_versions = [
     v"15.0.7+10",
     v"16.0.6+4",
-    v"17.0.6+5"
+    v"17.0.6+5",
+    v"18.1.7+3",
+    v"19.1.1+0",
 ]
 
 augment_platform_block = """
@@ -59,5 +61,3 @@ for (i, build) in enumerate(builds)
                    skip_audit=true, dont_dlopen=true, julia_compat="1.10",
                    augment_platform_block)
 end
-
-# bump

L/LLVM/LLD@14/build_tarballs.jl

@@ -38,4 +38,4 @@ for (i, build) in enumerate(builds)
                    augment_platform_block)
 end
 
-#let's build!
+# bump

L/LLVM/LLD@15/build_tarballs.jl

@@ -37,3 +37,5 @@ for (i, build) in enumerate(builds)
                    skip_audit=true, julia_compat="1.9",
                    augment_platform_block)
 end
+
+# bump

L/LLVM/LLD@16/build_tarballs.jl

@@ -37,3 +37,5 @@ for (i, build) in enumerate(builds)
                    skip_audit=true, julia_compat="1.11",
                    augment_platform_block)
 end
+
+# bump

L/LLVM/LLD@17/build_tarballs.jl

@@ -37,3 +37,5 @@ for (i, build) in enumerate(builds)
                    skip_audit=true, julia_compat="1.11",
                    augment_platform_block)
 end
+
+# bump

L/LLVM/LLD@18/build_tarballs.jl

@@ -37,4 +37,5 @@ for (i, build) in enumerate(builds)
                    skip_audit=true, julia_compat="1.12",
                    augment_platform_block)
 end
-#!
+
+# bump

L/LLVM/LLD@19/build_tarballs.jl

@@ -37,4 +37,5 @@ for (i, build) in enumerate(builds)
                    skip_audit=true, julia_compat="1.12",
                    augment_platform_block)
 end
-#!
+
+# bump

L/LLVM/LLD_unified/build_tarballs.jl

@@ -0,0 +1,63 @@
+using BinaryBuilder, Pkg
+using Base.BinaryPlatforms
+
+const YGGDRASIL_DIR = "../../.."
+include(joinpath(YGGDRASIL_DIR, "fancy_toys.jl"))
+include(joinpath(YGGDRASIL_DIR, "platforms", "llvm.jl"))
+include("../common.jl")
+
+name = "LLD_unified"
+version = v"0.1"
+llvm_full_versions = [
+    v"15.0.7+10",
+    v"16.0.6+4",
+    v"17.0.6+5",
+    v"18.1.7+3",
+    v"19.1.1+0",
+]
+
+augment_platform_block = """
+    using Base.BinaryPlatforms
+
+    $(LLVM.augment)
+
+    function augment_platform!(platform::Platform)
+        augment_llvm!(platform)
+    end"""
+
+# determine exactly which tarballs we should build
+builds = []
+for llvm_assertions in (false, true), llvm_full_version in llvm_full_versions
+    llvm_full_version >= v"15" || continue
+    libllvm_version = llvm_full_version
+    _, _, sources, script, platforms, products, dependencies =
+        configure_extraction(ARGS, llvm_full_version, "LLD", libllvm_version;
+                             assert=llvm_assertions, augmentation=true,
+                             dont_dlopen=false)
+    # ignore the output version, as we want a unified JLL
+    dependencies = map(dependencies) do dep
+        # ignore the version of any LLVM dependency, as we'll automatically load
+        # an appropriate version of LLD via platform augmentations
+        # TODO: make this an argument to `configure_extraction`?
+        if isa(dep, Dependency) && contains(dep.pkg.name, "LLVM")
+            Dependency(dep.pkg.name; dep.platforms)
+        else
+            dep
+        end
+    end
+    push!(builds, [name, version, sources, script, platforms, products, dependencies])
+end
+
+# don't allow `build_tarballs` to override platform selection based on ARGS.
+# we handle that ourselves by calling `should_build_platform`
+non_platform_ARGS = filter(arg -> startswith(arg, "--"), ARGS)
+
+# `--register` should only be passed to the latest `build_tarballs` invocation
+non_reg_ARGS = filter(arg -> arg != "--register", non_platform_ARGS)
+
+for (i, build) in enumerate(builds)
+    build_tarballs(i == lastindex(builds) ? non_platform_ARGS : non_reg_ARGS,
+                   build...;
+                   skip_audit=true, dont_dlopen=true, julia_compat="1.10",
+                   augment_platform_block)
+end

L/LLVM/common.jl

@@ -728,6 +728,11 @@ function configure_extraction(ARGS, LLVM_full_version, name, libLLVM_version=not
         script = lldscript
         products = [
             ExecutableProduct("lld", :lld, "tools"),
+            ExecutableProduct("ld.lld", :ld_lld, "tools"),      # Unix
+            ExecutableProduct("ld64.lld", :ld64_lld, "tools"),  # macOS
+            ExecutableProduct("lld-link", :lld_link, "tools"),  # Windows
+            ExecutableProduct("wasm-ld", :wasm_ld, "tools"),    # WebAssembly
+
             ExecutableProduct("dsymutil", :dsymutil, "tools"),
         ]
 
@@ -756,6 +761,10 @@ function configure_extraction(ARGS, LLVM_full_version, name, libLLVM_version=not
         # We don't build LLVM 15 for i686-linux-musl.
         filter!(p -> !(arch(p) == "i686" && libc(p) == "musl"), platforms)
     end
+    if version < v"18"
+        # We only have LLVM builds for AArch64 BSD starting from LLVM 18
+        filter!(p -> !(Sys.isfreebsd(p) && arch(p) == "aarch64"), platforms)
+    end
     platforms = expand_cxxstring_abis(platforms)
 
     if augmentation