6.20. libarchive 3.8.7

Licenses:

• BSD-2-Clause (primary)
• BSD-3-Clause, public domain, and other permissive notices in selected files

Dependencies:

• musl (libc)
• cmake
• make
• zlib-ng (libz)

libarchive is a multi-format archive reading and writing library plus BSD archive utilities. we need it to provide tar, cpio, and unzip command compatibility in the target userspace.

Extract and Enter the Source Tree

cd "$LBI_SOURCES"
tar -xf libarchive-3.8.7.tar.xz
cd libarchive-3.8.7

Configure libarchive (CMake Path)

lbi_cmake build \
    -DCMAKE_C_COMPILER="$LBI_ROOT/system/tools/bin/$LBI_TARGET-clang" \
    -DCMAKE_AR="$LBI_ROOT/system/tools/bin/$LBI_TARGET-ar" \
    -DCMAKE_RANLIB="$LBI_ROOT/system/tools/bin/$LBI_TARGET-ranlib" \
    -DCMAKE_C_FLAGS="--target=$LBI_TARGET --sysroot=$LBI_ROOT $LWI_CFLAGS" \
    -DCMAKE_SHARED_LINKER_FLAGS="--target=$LBI_TARGET --sysroot=$LBI_ROOT $LBI_CUSTOM_LDFLAGS" \
    -DCMAKE_EXE_LINKER_FLAGS="--target=$LBI_TARGET --sysroot=$LBI_ROOT $LBI_CUSTOM_LDFLAGS" \
    -DBUILD_SHARED_LIBS=ON \
    -DENABLE_TAR=ON \
    -DENABLE_CPIO=ON \
    -DENABLE_UNZIP=ON \
    -DENABLE_CAT=OFF \
    -DENABLE_ZLIB=ON \
    -DENABLE_OPENSSL=OFF \
    -DENABLE_BZip2=OFF \
    -DENABLE_LZMA=OFF \
    -DENABLE_ZSTD=OFF \
    -DENABLE_LZ4=OFF \
    -DENABLE_LZO=OFF \
    -DENABLE_LIBB2=OFF \
    -DENABLE_LIBXML2=OFF \
    -DENABLE_EXPAT=OFF \
    -DENABLE_ICONV=OFF \
    -DENABLE_ACL=OFF \
    -DENABLE_XATTR=OFF \
    -DENABLE_TEST=OFF

Build libarchive

cmake --build build $LWI_MAKE_FLAGS

Install libarchive

DESTDIR="$LBI_ROOT" cmake --install build

Normalize Installed Paths to LBI Layout

install -d \
    "$LBI_ROOT/system/binaries" \
    "$LBI_ROOT/system/headers" \
    "$LBI_ROOT/system/documentation/man-pages/man1" \
    "$LBI_ROOT/system/documentation/man-pages/man3" \
    "$LBI_ROOT/system/documentation/man-pages/man5"

if [ -d "$LBI_ROOT/system/bin" ]; then
    mv -v "$LBI_ROOT/system/bin/"* "$LBI_ROOT/system/binaries/" 2>/dev/null || true
    rmdir -v "$LBI_ROOT/system/bin" 2>/dev/null || true
fi

if [ -d "$LBI_ROOT/system/include" ]; then
    mv -v "$LBI_ROOT/system/include/"* "$LBI_ROOT/system/headers/" 2>/dev/null || true
    rmdir -v "$LBI_ROOT/system/include" 2>/dev/null || true
fi

for sec in man1 man3 man5; do
    if [ -d "$LBI_ROOT/system/share/man/$sec" ]; then
        mv -v "$LBI_ROOT/system/share/man/$sec/"* \
            "$LBI_ROOT/system/documentation/man-pages/$sec/" 2>/dev/null || true
        rmdir -v "$LBI_ROOT/system/share/man/$sec" 2>/dev/null || true
    fi
done

Post-install pkg-config Fix

sed -i \
    -e 's|^prefix=.*$|prefix=/system|' \
    -e 's|^exec_prefix=.*$|exec_prefix=${prefix}|' \
    -e 's|^libdir=.*$|libdir=${exec_prefix}/libraries|' \
    -e 's|^includedir=.*$|includedir=${prefix}/headers|' \
    "$LBI_ROOT/system/libraries/pkgconfig/libarchive.pc"

Provide tar, cpio, and unzip Commands

ln -sf bsdtar "$LBI_ROOT/system/binaries/tar"
ln -sf bsdcpio "$LBI_ROOT/system/binaries/cpio"
ln -sf bsdunzip "$LBI_ROOT/system/binaries/unzip"

Command Explanations

• lbi_cmake build: Configures libarchive with the book's CMake helper and writes generated files into the build directory.
• -DCMAKE_C_COMPILER, -DCMAKE_AR, and -DCMAKE_RANLIB: Use the target-prefixed LLVM compiler and archive tools.
• -DCMAKE_C_FLAGS, -DCMAKE_SHARED_LINKER_FLAGS, and -DCMAKE_EXE_LINKER_FLAGS: Target the selected triple/sysroot and preserve local compile/link tuning.
• -DBUILD_SHARED_LIBS=ON: Builds shared libraries for the target system.
• -DENABLE_TAR=ON, -DENABLE_CPIO=ON, and -DENABLE_UNZIP=ON: Builds the archive command-line tools needed for command compatibility.
• -DENABLE_CAT=OFF: Skips the optional bsdcat tool.
• -DENABLE_ZLIB=ON: Enables gzip/deflate support through the installed zlib-compatible library.
• -DENABLE_OPENSSL=OFF, -DENABLE_BZip2=OFF, -DENABLE_LZMA=OFF, -DENABLE_ZSTD=OFF, -DENABLE_LZ4=OFF, -DENABLE_LZO=OFF, -DENABLE_LIBB2=OFF, -DENABLE_LIBXML2=OFF, -DENABLE_EXPAT=OFF, -DENABLE_ICONV=OFF, -DENABLE_ACL=OFF, and -DENABLE_XATTR=OFF: Disable optional dependencies that are not part of this early target userspace.
• -DENABLE_TEST=OFF: Skips test programs during the bootstrap build.
• cmake --build build $LWI_MAKE_FLAGS: Builds the configured tree using the shared parallel build setting.
• DESTDIR="$LBI_ROOT" cmake --install build: Installs into the target root rather than the host filesystem.
• install -d ...: Creates the final destination directories required by the book's layout.
• mv -v "$LBI_ROOT/system/bin/"* ... and mv -v "$LBI_ROOT/system/include/"* ...: Move upstream CMake install outputs into /system/binaries and /system/headers.
• for sec in man1 man3 man5; do ... done: Moves installed manual pages from upstream's share/man layout into the book's documentation tree.
• 2>/dev/null || true: Allows cleanup moves and directory removals to be harmless when an optional directory is empty or absent.
• sed -i ... libarchive.pc: Rewrites pkg-config metadata so later builds discover libarchive under /system/libraries and /system/headers.
• ln -sf bsdtar ... tar, ln -sf bsdcpio ... cpio, and ln -sf bsdunzip ... unzip: Provide standard archive command names through libarchive's BSD tools.