[OpenWrt-Devel,v2,1/4] tools: add zstd

diff --git a/tools/Makefile b/tools/Makefile
index 02556d4b83f3..ae230a7c88cd 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -33,7 +33,7 @@  tools-$(CONFIG_TARGET_mxs) += elftosb sdimage
 tools-$(CONFIG_TARGET_ar71xx) += lzma-old
 tools-$(CONFIG_TARGET_ar71xx)$(CONFIG_TARGET_ath79) += squashfs
 tools-$(CONFIG_USES_MINOR) += kernel2minor
-tools-y += lzma squashfskit4 zip
+tools-y += lzma squashfskit4 zip zstd
 tools-$(BUILD_B43_TOOLS) += b43-tools
 tools-$(BUILD_ISL) += isl
 tools-$(CONFIG_USE_SPARSE) += sparse
diff --git a/tools/zstd/Makefile b/tools/zstd/Makefile
new file mode 100644
index 000000000000..7459725e8e79
--- /dev/null
+++ b/tools/zstd/Makefile
@@ -0,0 +1,20 @@ 
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=zstd
+PKG_VERSION:=1.4.4
+
+PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
+PKG_SOURCE_URL:=@GITHUB/facebook/zstd/releases/download/v$(PKG_VERSION)
+PKG_HASH:=a364f5162c7d1a455cc915e8e3cf5f4bd8b75d09bc0f53965b0c9ca1383c52c8
+
+PKG_LICENSE:=BSD-3-Clause
+PKG_LICENSE_FILES:=LICENSE
+PKG_CPE_ID:=cpe:/a:facebook:zstandard
+
+HOST_BUILD_PARALLEL:=1
+
+include $(INCLUDE_DIR)/host-build.mk
+
+HOST_MAKE_FLAGS = PREFIX=$(HOST_BUILD_PREFIX) HAVE_ZLIB=0 HAVE_LZMA=0 HAVE_LZ4=0
+
+$(eval $(call HostBuild))
diff --git a/tools/zstd/patches/0001-build-issue-More-portable-header-prefix-usage-1987.patch b/tools/zstd/patches/0001-build-issue-More-portable-header-prefix-usage-1987.patch
new file mode 100644
index 000000000000..6d743aa38552
--- /dev/null
+++ b/tools/zstd/patches/0001-build-issue-More-portable-header-prefix-usage-1987.patch
@@ -0,0 +1,61 @@ 
+From 06a57cf57e3c4e887cadcf688e3081154f3f6db4 Mon Sep 17 00:00:00 2001
+Message-Id: <06a57cf57e3c4e887cadcf688e3081154f3f6db4.1589392463.git.mschiffer@universe-factory.net>
+From: Bimba Shrestha <bimbashrestha@fb.com>
+Date: Thu, 6 Feb 2020 14:10:51 -0800
+Subject: [PATCH] [build-issue] More portable header prefix usage (#) (#1987)
+
+* make 4.3 build issue fix
+
+* Changing header name and adding comment
+---
+ programs/Makefile | 11 +++++++----
+ 1 file changed, 7 insertions(+), 4 deletions(-)
+
+diff --git a/programs/Makefile b/programs/Makefile
+index b75314a83f43..a9ee3cb5311b 100644
+--- a/programs/Makefile
++++ b/programs/Makefile
+@@ -94,9 +94,12 @@ endif
+ 
+ VOID = /dev/null
+ 
++# Make 4.3 doesn't support '\#' anymore (https://lwn.net/Articles/810071/)
++NUM_SYMBOL := \#
++
+ # thread detection
+ NO_THREAD_MSG := ==> no threads, building without multithreading support
+-HAVE_PTHREAD := $(shell printf '\#include <pthread.h>\nint main(void) { return 0; }' > have_pthread.c && $(CC) $(FLAGS) -o have_pthread$(EXT) have_pthread.c -pthread 2> $(VOID) && rm have_pthread$(EXT) && echo 1 || echo 0; rm have_pthread.c)
++HAVE_PTHREAD := $(shell printf '$(NUM_SYMBOL)include <pthread.h>\nint main(void) { return 0; }' > have_pthread.c && $(CC) $(FLAGS) -o have_pthread$(EXT) have_pthread.c -pthread 2> $(VOID) && rm have_pthread$(EXT) && echo 1 || echo 0; rm have_pthread.c)
+ HAVE_THREAD := $(shell [ "$(HAVE_PTHREAD)" -eq "1" -o -n "$(filter Windows%,$(OS))" ] && echo 1 || echo 0)
+ ifeq ($(HAVE_THREAD), 1)
+ THREAD_MSG := ==> building with threading support
+@@ -108,7 +111,7 @@ endif
+ 
+ # zlib detection
+ NO_ZLIB_MSG := ==> no zlib, building zstd without .gz support
+-HAVE_ZLIB := $(shell printf '\#include <zlib.h>\nint main(void) { return 0; }' > have_zlib.c && $(CC) $(FLAGS) -o have_zlib$(EXT) have_zlib.c -lz 2> $(VOID) && rm have_zlib$(EXT) && echo 1 || echo 0; rm have_zlib.c)
++HAVE_ZLIB := $(shell printf '$(NUM_SYMBOL)include <zlib.h>\nint main(void) { return 0; }' > have_zlib.c && $(CC) $(FLAGS) -o have_zlib$(EXT) have_zlib.c -lz 2> $(VOID) && rm have_zlib$(EXT) && echo 1 || echo 0; rm have_zlib.c)
+ ifeq ($(HAVE_ZLIB), 1)
+ ZLIB_MSG := ==> building zstd with .gz compression support
+ ZLIBCPP = -DZSTD_GZCOMPRESS -DZSTD_GZDECOMPRESS
+@@ -119,7 +122,7 @@ endif
+ 
+ # lzma detection
+ NO_LZMA_MSG := ==> no liblzma, building zstd without .xz/.lzma support
+-HAVE_LZMA := $(shell printf '\#include <lzma.h>\nint main(void) { return 0; }' > have_lzma.c && $(CC) $(FLAGS) -o have_lzma$(EXT) have_lzma.c -llzma 2> $(VOID) && rm have_lzma$(EXT) && echo 1 || echo 0; rm have_lzma.c)
++HAVE_LZMA := $(shell printf '$(NUM_SYMBOL)include <lzma.h>\nint main(void) { return 0; }' > have_lzma.c && $(CC) $(FLAGS) -o have_lzma$(EXT) have_lzma.c -llzma 2> $(VOID) && rm have_lzma$(EXT) && echo 1 || echo 0; rm have_lzma.c)
+ ifeq ($(HAVE_LZMA), 1)
+ LZMA_MSG := ==> building zstd with .xz/.lzma compression support
+ LZMACPP = -DZSTD_LZMACOMPRESS -DZSTD_LZMADECOMPRESS
+@@ -130,7 +133,7 @@ endif
+ 
+ # lz4 detection
+ NO_LZ4_MSG := ==> no liblz4, building zstd without .lz4 support
+-HAVE_LZ4 := $(shell printf '\#include <lz4frame.h>\n\#include <lz4.h>\nint main(void) { return 0; }' > have_lz4.c && $(CC) $(FLAGS) -o have_lz4$(EXT) have_lz4.c -llz4 2> $(VOID) && rm have_lz4$(EXT) && echo 1 || echo 0; rm have_lz4.c)
++HAVE_LZ4 := $(shell printf '$(NUM_SYMBOL)include <lz4frame.h>\n\#include <lz4.h>\nint main(void) { return 0; }' > have_lz4.c && $(CC) $(FLAGS) -o have_lz4$(EXT) have_lz4.c -llz4 2> $(VOID) && rm have_lz4$(EXT) && echo 1 || echo 0; rm have_lz4.c)
+ ifeq ($(HAVE_LZ4), 1)
+ LZ4_MSG := ==> building zstd with .lz4 compression support
+ LZ4CPP = -DZSTD_LZ4COMPRESS -DZSTD_LZ4DECOMPRESS
+-- 
+2.26.2
+