[zorg][lldb-statistics] Don't fetch artifacts for now

Ideally we'd want to fetch the Clang/LLDB binary that
the incremental LLDB bots produced. However, they currently
don't publish their artifacts. Until they do, build the host
Clang/LLDB.

Author: Michael137

zorg/jenkins/jobs/jobs/lldb-statistics

@@ -34,7 +34,11 @@ pipeline {
     parameters {
         string(name: 'LABEL', defaultValue: params.LABEL ?: 'macos-x86_64', description: 'Node label to run on')
         string(name: 'GIT_SHA', defaultValue: params.GIT_REVISION ?: '*/release/19.x', description: 'Git commit to build.')
-        string(name: 'ARTIFACT', defaultValue: params.ARTIFACT ?: 'lldb-cmake-intel/latest', description: 'Clang/LLDB artifact to use')
+
+        // TODO: we should get LLDB as an artifact from the lldb-cmake-intel/latest job. Said job doesn't currently
+        // publish LLDB/Clang as an artifact however. So instead we build Clang/LLDB from top-of-tree main.
+        // string(name: 'ARTIFACT', defaultValue: params.ARTIFACT ?: 'lldb-cmake-intel/latest', description: 'Clang/LLDB artifact to use')
+
         booleanParam(name: 'CLEAN', defaultValue: params.CLEAN ?: false, description: 'Wipe the build directory?')
     }
 
@@ -63,6 +67,16 @@ pipeline {
                             noTags: true, timeout: 30]
                         ]])
                     }
+                    dir('src/host-main') {
+                        checkout([$class: 'GitSCM', branches: [
+                            [name: '*/main']
+                        ], userRemoteConfigs: [
+                            [url: 'https://github.com/llvm/llvm-project.git']
+                        ], extensions: [
+                            [$class: 'CloneOption',
+                            noTags: true, timeout: 30]
+                        ]])
+                    }
                     dir('llvm-zorg') {
                         checkout([$class: 'GitSCM', branches: [
                             [name: '*/main']
@@ -88,32 +102,64 @@ pipeline {
                '''
             }
         }
-        stage('Fetch Artifact') {
+        stage('Build (host)') {
             environment {
                PATH="$PATH:/usr/bin:/usr/local/bin"
+               SRC="$WORKSPACE/src"
+               HOST_SRC="$WORKSPACE/src/host-main"
+               HOST_BUILD="$WORKSPACE/host-main-build"
             }
             steps {
                 withCredentials([string(credentialsId: 's3_resource_bucket', variable: 'S3_BUCKET')]) {
-                    sh """
-                        source ./venv/bin/activate
-                        echo "ARTIFACT=${params.ARTIFACT}"
-                        python llvm-zorg/zorg/jenkins/monorepo_build.py fetch
-                        ls $WORKSPACE/host-compiler/lib/clang/
-                        VERSION=`ls $WORKSPACE/host-compiler/lib/clang/`
-                    """
+                    sh '''
+                       source ./venv/bin/activate
+
+                       cd $HOST_SRC
+                       git tag -a -m "First Commit" first_commit 97724f18c79c7cc81ced24239eb5e883bf1398ef || true
+
+                       git_desc=$(git describe --match "first_commit")
+                       export GIT_DISTANCE=$(echo ${git_desc} | cut -f 2 -d "-")
+
+                       sha=$(echo ${git_desc} | cut -f 3 -d "-")
+                       export GIT_SHA=${sha:1}
+
+                       cd -
+
+                       set -eux
+
+                       $CXX --version
+                       LLVM_REV=${GIT_DISTANCE}
+
+                       mkdir -p host-main-src
+                       mkdir -p host-main-build
+                       rsync -a $HOST_SRC/ host-main-src/
+                       cd host-main-build
+                       cmake ../host-main-src/llvm \
+                         -DCMAKE_BUILD_TYPE=Release \
+                         -DLLVM_ENABLE_PROJECTS="clang;lldb" \
+                         -DLLVM_ENABLE_ASSERTIONS=Off \
+                         -DLLVM_ENABLE_MODULES=Off \
+                         -DLLDB_INCLUDE_TESTS=Off \
+                         -DLLDB_ENABLE_PYTHON=On \
+                         -DLLDB_ENABLE_LUA=Off \
+                         -DLLVM_TARGETS_TO_BUILD='X86;AArch64' \
+                         -DCMAKE_EXPORT_COMPILE_COMMANDS=On \
+                         -G Ninja
+                       cmake --build .
+                       cd ../..
+                   '''
                 }
             }
         }
-        stage('Build') {
+        stage('Build (historic)') {
             environment {
                PATH="$PATH:/usr/bin:/usr/local/bin"
                SRC="$WORKSPACE/src"
                BUILD="$WORKSPACE/clang-19-build"
-               TEST="$WORKSPACE/test"
-               RESULTS="$WORKSPACE/results"
-               CC="$WORKSPACE/host-compiler/bin/clang"
-               CXX="$WORKSPACE/host-compiler/bin/clang++"
+               HOST_BUILD="$WORKSPACE/clang-19-build"
                HISTORIC_COMPILER="clang-19"
+               CC="$WORKSPACE/host-main-build/bin/clang"
+               CXX="$WORKSPACE/host-main-build/bin/clang++"
             }
             steps {
                 withCredentials([string(credentialsId: 's3_resource_bucket', variable: 'S3_BUCKET')]) {
@@ -161,7 +207,7 @@ pipeline {
         }
         stage('Run metrics') {
             environment {
-               HOST_BUILD_DIR="$WORKSPACE/host-compiler"
+               HOST_BUILD_DIR="$WORKSPACE/host-build"
                HISTORIC_BUILD_DIR="$WORKSPACE/clang-19-build/tools/clang/stage2-bins"
             }
             steps {