llvm: fix up package depenencies

This was based off of a clang-built dylib build, so perhaps lld doesn't
need to depend on llvm if it was statically linked, but I think moving
forward we'd be better off with a dylib build once we can do it with the
clang in the repos.

llvm/PKGBUILD

@@ -24,9 +24,10 @@ makedepends=('cmake'
              'gcc'
              'ninja'
              'pkgconf'
-             'libffi'
              'python'
              'git'
+             'libzstd-devel'
+             'zlib-devel'
              )
 _url=https://github.com/llvm/llvm-project/releases/download/${_tag}
 source=("${_url}/llvm-${pkgver}.src.tar.xz"{,.sig}
@@ -213,7 +214,8 @@ build() {
 package_clang() {
   pkgdesc="C language family frontend for LLVM"
   url="https://clang.llvm.org/"
-  depends=("llvm=${pkgver}")
+  depends=("gcc" "llvm=${pkgver}")
+  optdepends=("compiler-rt: for -rtlib=compiler-rt")
 
   # Disable automatic installation of components that go into subpackages
   # -i.orig to check what has been removed in-case it starts dropping more than it should
@@ -233,8 +235,7 @@ package_clang() {
 package_clang-analyzer() {
   pkgdesc="A source code analysis framework"
   url="https://clang-analyzer.llvm.org/"
-  depends=("clang=${pkgver}"
-           "python")
+  depends=("clang=${pkgver}" "python")
 
   local _analyzer
   for _analyzer in scan-build scan-build-py scan-view; do
@@ -261,9 +262,7 @@ package_compiler-rt() {
 package_lld() {
   pkgdesc="Linker tools for LLVM"
   url="https://lld.llvm.org/"
-  depends=("gcc-libs"
-           "zlib"
-           "zstd")
+  depends=("gcc-libs" "llvm=${pkgver}")
 
   DESTDIR="${pkgdir}" cmake --install "${srcdir}"/build/tools/lld
 
@@ -272,6 +271,7 @@ package_lld() {
 
 package_llvm() {
   pkgdesc="Low Level Virtual Machine"
+  depends=("gcc-libs" "libzstd" "zlib")
 
   # Disable automatic installation of components that go into subpackages
   # -i.orig to check what has been removed in-case it starts dropping more than it should