#!/bin/bash
# ============================================================================
# DarkForge Linux — Phase 0, Chapter 5: Libstdc++ (from GCC)
# ============================================================================
# Purpose:  Build the C++ standard library (libstdc++) for the target.
#           This was deferred from GCC Pass 1 because it depends on glibc,
#           which wasn't available then. Now that glibc is installed in the
#           target sysroot, we can build libstdc++.
# Inputs:   ${LFS}/sources/gcc-15.2.0.tar.xz (same source as GCC Pass 1)
# Outputs:  libstdc++ in ${LFS}/usr/lib/
# Assumes:  GCC Pass 1 + Glibc complete
# Ref:      LFS 13.0 §5.6
# ============================================================================

set -euo pipefail
source "${LFS}/sources/darkforge-env.sh"

PACKAGE="gcc"
VERSION="15.2.0"
SRCDIR="${LFS}/sources"

echo "=== Building libstdc++ from ${PACKAGE}-${VERSION} ==="

cd "${SRCDIR}"
tar -xf "${PACKAGE}-${VERSION}.tar.xz"
cd "${PACKAGE}-${VERSION}"

mkdir -v build
cd build

# Configure only the libstdc++ component
# --host=$LFS_TGT: cross-compile for our target
# --disable-multilib: no 32-bit support at this stage
# --disable-nls: no internationalization
# --disable-libstdcxx-pch: skip precompiled headers (saves time/space)
# --with-gxx-include-dir: point to the cross-compiler's include path
../libstdc++-v3/configure \
    --host="${LFS_TGT}" \
    --build="$(../config.guess)" \
    --prefix=/usr \
    --disable-multilib \
    --disable-nls \
    --disable-libstdcxx-pch \
    --with-gxx-include-dir="/tools/${LFS_TGT}/include/c++/${VERSION}"

make
make DESTDIR="${LFS}" install

# Remove libtool archive files — they cause problems with cross-compilation
rm -v "${LFS}/usr/lib/lib"{stdc++{,exp,fs},supc++}.la 2>/dev/null || true

# Cleanup
cd "${SRCDIR}"
rm -rf "${PACKAGE}-${VERSION}"

echo "=== libstdc++ from ${PACKAGE}-${VERSION} complete ==="