+# ################################################################
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under both the BSD-style license (found in the
+# LICENSE file in the root directory of this source tree) and the GPLv2 (found
+# in the COPYING file in the root directory of this source tree).
+# You may select, at your option, one of the above-listed licenses.
+# ################################################################
+
+.PHONY: libzstd
+libzstd:
+ rm -rf linux
+ mkdir -p linux
+ mkdir -p linux/include/linux
+ mkdir -p linux/lib/zstd
+ ../freestanding_lib/freestanding.py \
+ --source-lib ../../lib \
+ --output-lib linux/lib/zstd \
+ --xxhash '<linux/xxhash.h>' \
+ --xxh64-state 'struct xxh64_state' \
+ --xxh64-prefix 'xxh64' \
+ --rewrite-include '<limits\.h>=<linux/limits.h>' \
+ --rewrite-include '<stddef\.h>=<linux/types.h>' \
+ --rewrite-include '"\.\./zstd.h"=<linux/zstd.h>' \
+ --rewrite-include '"(\.\./)?zstd_errors.h"=<linux/zstd_errors.h>' \
+ --sed 's,/\*\*\*,/* *,g' \
+ --sed 's,/\*\*,/*,g' \
+ --spdx \
+ -DZSTD_NO_INTRINSICS \
+ -DZSTD_NO_UNUSED_FUNCTIONS \
+ -DZSTD_LEGACY_SUPPORT=0 \
+ -DZSTD_STATIC_LINKING_ONLY \
+ -DFSE_STATIC_LINKING_ONLY \
+ -DXXH_STATIC_LINKING_ONLY \
+ -D__GNUC__ \
+ -D__linux__=1 \
+ -DSTATIC_BMI2=0 \
+ -DZSTD_ADDRESS_SANITIZER=0 \
+ -DZSTD_MEMORY_SANITIZER=0 \
+ -DZSTD_DATAFLOW_SANITIZER=0 \
+ -DZSTD_COMPRESS_HEAPMODE=1 \
+ -UNO_PREFETCH \
+ -U__cplusplus \
+ -UZSTD_DLL_EXPORT \
+ -UZSTD_DLL_IMPORT \
+ -U__ICCARM__ \
+ -UZSTD_MULTITHREAD \
+ -U_MSC_VER \
+ -U_WIN32 \
+ -RZSTDLIB_VISIBLE= \
+ -RZSTDERRORLIB_VISIBLE= \
+ -RZSTD_FALLTHROUGH=fallthrough \
+ -DZSTD_HAVE_WEAK_SYMBOLS=0 \
+ -DZSTD_TRACE=0 \
+ -DZSTD_NO_TRACE \
+ -DZSTD_DISABLE_ASM \
+ -DZSTD_LINUX_KERNEL
+ rm linux/lib/zstd/decompress/huf_decompress_amd64.S
+ mv linux/lib/zstd/zstd.h linux/include/linux/zstd_lib.h
+ mv linux/lib/zstd/zstd_errors.h linux/include/linux/
+ cp linux_zstd.h linux/include/linux/zstd.h
+ cp zstd_common_module.c linux/lib/zstd
+ cp zstd_compress_module.c linux/lib/zstd
+ cp zstd_decompress_module.c linux/lib/zstd
+ cp decompress_sources.h linux/lib/zstd
+ cp linux.mk linux/lib/zstd/Makefile
+
+LINUX ?= $(HOME)/repos/linux
+
+.PHONY: import
+import: libzstd
+ rm -f $(LINUX)/include/linux/zstd.h
+ rm -f $(LINUX)/include/linux/zstd_errors.h
+ rm -rf $(LINUX)/lib/zstd
+ cp linux/include/linux/zstd.h $(LINUX)/include/linux
+ cp linux/include/linux/zstd_lib.h $(LINUX)/include/linux
+ cp linux/include/linux/zstd_errors.h $(LINUX)/include/linux
+ cp -r linux/lib/zstd $(LINUX)/lib
+
+import-upstream:
+ rm -rf $(LINUX)/lib/zstd
+ mkdir $(LINUX)/lib/zstd
+ cp ../../lib/zstd.h $(LINUX)/include/linux/zstd_lib.h
+ cp -r ../../lib/common $(LINUX)/lib/zstd
+ cp -r ../../lib/compress $(LINUX)/lib/zstd
+ cp -r ../../lib/decompress $(LINUX)/lib/zstd
+ mv $(LINUX)/lib/zstd/zstd_errors.h $(LINUX)/include/linux
+ rm $(LINUX)/lib/zstd/common/threading.*
+ rm $(LINUX)/lib/zstd/common/pool.*
+ rm $(LINUX)/lib/zstd/common/xxhash.*
+ rm $(LINUX)/lib/zstd/compress/zstdmt_*
+
+DEBUGFLAGS= -Wall -Wextra -Wcast-qual -Wcast-align -Wshadow \
+ -Wstrict-aliasing=1 -Wswitch-enum -Wdeclaration-after-statement \
+ -Wstrict-prototypes -Wundef -Wpointer-arith \
+ -Wvla -Wformat=2 -Winit-self -Wfloat-equal -Wwrite-strings \
+ -Wredundant-decls -Wmissing-prototypes -Wc++-compat \
+ -Wimplicit-fallthrough
+
+.PHONY: test
+test: libzstd
+ $(MAKE) -C test run-test CFLAGS="-O3 $(CFLAGS) $(DEBUGFLAGS) -Werror" -j
+
+.PHONY: clean
+clean:
+ $(RM) -rf linux
+ $(MAKE) -C test clean