From e4a59f664b74eec8effb62b3663cf12710ba7caf Mon Sep 17 00:00:00 2001
From: Andrew Kaster <akaster@serenityos.org>
Date: Sat, 10 Dec 2022 13:30:00 -0700
Subject: [PATCH] Toolchain+Meta: Add script to build CMake from source

Since we upstreamed CMake support for Serenity, we can use the Platform
files from upstream instead of keeping our local copy. While not added
in this commit, we can add patching capabilities for the platform files
similar to what we do for gdb, llvm, gcc, and binutils later.
---
 Meta/CMake/cmake-version.cmake |  6 ++++
 Toolchain/BuildCMake.sh        | 61 ++++++++++++++++++++++++++++++++++
 2 files changed, 67 insertions(+)
 create mode 100644 Meta/CMake/cmake-version.cmake
 create mode 100755 Toolchain/BuildCMake.sh

diff --git a/Meta/CMake/cmake-version.cmake b/Meta/CMake/cmake-version.cmake
new file mode 100644
index 00000000000..f38c247e40f
--- /dev/null
+++ b/Meta/CMake/cmake-version.cmake
@@ -0,0 +1,6 @@
+# Note: Update this alongside Toolchain/BuildCMake.sh
+set(version_ok 0)
+if (CMAKE_VERSION VERSION_GREATER_EQUAL 3.25.1)
+    set(version_ok 1)
+endif()
+execute_process(COMMAND "${CMAKE_COMMAND}" -E echo "${version_ok}")
diff --git a/Toolchain/BuildCMake.sh b/Toolchain/BuildCMake.sh
new file mode 100755
index 00000000000..28da6098d78
--- /dev/null
+++ b/Toolchain/BuildCMake.sh
@@ -0,0 +1,61 @@
+#!/usr/bin/env bash
+
+# This script builds the CMake build system
+set -e
+
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+
+PREFIX_DIR="$DIR/Local/cmake"
+BUILD_DIR="$DIR/Build/cmake"
+TARBALLS_DIR="$DIR/Tarballs"
+
+NPROC="nproc"
+SYSTEM_NAME="$(uname -s)"
+
+if [ "$SYSTEM_NAME" = "OpenBSD" ]; then
+    NPROC="sysctl -n hw.ncpuonline"
+elif [ "$SYSTEM_NAME" = "FreeBSD" ]; then
+    NPROC="sysctl -n hw.ncpu"
+elif [ "$SYSTEM_NAME" = "Darwin" ]; then
+    NPROC="sysctl -n hw.ncpu"
+fi
+
+[ -z "$MAKEJOBS" ] && MAKEJOBS=$($NPROC)
+
+# Note: Update this alongside Meta/CMake/cmake-version.cmake
+CMAKE_VERSION=3.25.1
+CMAKE_ARCHIVE_SHA256=1c511d09516af493694ed9baf13c55947a36389674d657a2d5e0ccedc6b291d8
+CMAKE_ARCHIVE=cmake-${CMAKE_VERSION}.tar.gz
+CMAKE_ARCHIVE_URL=https://github.com/Kitware/CMake/releases/download/v${CMAKE_VERSION}/${CMAKE_ARCHIVE}
+
+mkdir -p "$DIR"/Tarballs
+pushd "$DIR"/Tarballs
+    if [ ! -e "${CMAKE_ARCHIVE}" ]; then
+        echo "Downloading CMake from ${CMAKE_ARCHIVE_URL}..."
+        curl "${CMAKE_ARCHIVE_URL}" -L -o "${CMAKE_ARCHIVE}"
+    else
+        echo "${CMAKE_ARCHIVE} already exists, not downloading archive"
+    fi
+
+    if ! sha256sum --status -c <(echo "${CMAKE_ARCHIVE_SHA256}" "${CMAKE_ARCHIVE}"); then
+        echo "CMake archive SHA256 sum mismatch, please run script again"
+        rm -f "${CMAKE_ARCHIVE}"
+        exit 1
+    fi
+
+    if [ ! -d "cmake-${CMAKE_VERSION}" ]; then
+        echo "Extracting ${CMAKE_ARCHIVE}..."
+        tar -xf "${CMAKE_ARCHIVE}"
+    else
+        echo "cmake-${CMAKE_VERSION} already exists, not extracting archive"
+    fi
+popd
+
+mkdir -p "${PREFIX_DIR}"
+mkdir -p "${BUILD_DIR}"
+
+pushd "${BUILD_DIR}"
+    "${TARBALLS_DIR}"/cmake-"${CMAKE_VERSION}"/bootstrap --prefix="${PREFIX_DIR}" --parallel="${MAKEJOBS}"
+    make -j "${MAKEJOBS}"
+    make install
+popd