#!/bin/bash
# ============================================================================
# DarkForge Linux — Phase 3, Chapter 8.14: M4
# ============================================================================
# Purpose:  Build and install m4, the macro processing language.
#           M4 is a dependency for autoconf/automake and other build tools.
#           Required for building other packages in Phase 3+.
# Inputs:   /sources/m4-1.4.21.tar.xz
# Outputs:  /usr/bin/m4
# Ref:      LFS 13.0 §8.14
# ============================================================================

set -euo pipefail
source /sources/toolchain-scripts/100-chroot-env.sh

PACKAGE="m4"
VERSION="1.4.21"

echo "=== Building ${PACKAGE}-${VERSION} (Phase 3) ==="

pkg_extract "${PACKAGE}-${VERSION}.tar.xz"
cd "${PACKAGE}-${VERSION}"

# Configure m4 for the target system
./configure --prefix=/usr

# Build m4
make

# Run tests to ensure build is correct
make check

# Install m4
make install

# Verify installation
if [ -x /usr/bin/m4 ]; then
    echo "PASS: m4 binary installed"
else
    echo "FAIL: m4 binary not found"
    exit 1
fi

# Test m4
echo "define(HELLO, Hello World)" | /usr/bin/m4 | grep -q "Hello World" && \
    echo "PASS: m4 works correctly"

pkg_cleanup "${PACKAGE}-${VERSION}"
echo "=== ${PACKAGE}-${VERSION} complete ==="