1. change some directory structure for the build script

2. add build script and document
   see DOC/BuildVentoyFromSource.txt for detail

Ventoy2Disk/Ventoy2Disk/xz-embedded-20130513/userspace/ventoy_makefile

+#
+# Makefile
+#
+# Author: Lasse Collin <lasse.collin@tukaani.org>
+#
+# This file has been put into the public domain.
+# You can do whatever you want with this file.
+#
+
+CC = /opt/diet32/bin/diet  gcc  -Os -m32    -std=gnu89
+BCJ_CPPFLAGS = -DXZ_DEC_X86 -DXZ_DEC_POWERPC -DXZ_DEC_IA64 \
+		-DXZ_DEC_ARM -DXZ_DEC_ARMTHUMB -DXZ_DEC_SPARC
+CPPFLAGS = -DXZ_USE_CRC64 -DXZ_DEC_ANY_CHECK
+CFLAGS = -ggdb3 -O2 -pedantic -Wall -Wextra
+RM = rm -f
+VPATH = ../linux/include/linux ../linux/lib/xz
+COMMON_SRCS = xz_crc32.c xz_crc64.c xz_dec_stream.c xz_dec_lzma2.c xz_dec_bcj.c
+COMMON_OBJS = $(COMMON_SRCS:.c=.o)
+XZMINIDEC_OBJS = xzminidec.o
+BYTETEST_OBJS = bytetest.o
+BUFTEST_OBJS = buftest.o
+BOOTTEST_OBJS = boottest.o
+XZ_HEADERS = xz.h xz_private.h xz_stream.h xz_lzma2.h xz_config.h
+PROGRAMS = xzminidec bytetest buftest boottest
+
+ALL_CPPFLAGS = -I../linux/include/linux -I. $(BCJ_CPPFLAGS) $(CPPFLAGS)
+
+all: $(PROGRAMS)
+
+%.o: %.c $(XZ_HEADERS)
+	$(CC) $(ALL_CPPFLAGS) $(CFLAGS) -c -o $@ $<
+
+xzminidec: $(COMMON_OBJS) $(XZMINIDEC_OBJS)
+	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $(COMMON_OBJS) $(XZMINIDEC_OBJS)
+
+bytetest: $(COMMON_OBJS) $(BYTETEST_OBJS)
+	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $(COMMON_OBJS) $(BYTETEST_OBJS)
+
+buftest: $(COMMON_OBJS) $(BUFTEST_OBJS)
+	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $(COMMON_OBJS) $(BUFTEST_OBJS)
+
+boottest: $(BOOTTEST_OBJS) $(COMMON_SRCS)
+	$(CC) $(ALL_CPPFLAGS) $(CFLAGS) $(LDFLAGS) -o $@ $(BOOTTEST_OBJS)
+
+.PHONY: clean
+clean:
+	-$(RM) $(COMMON_OBJS) $(XZMINIDEC_OBJS) $(BUFTEST_OBJS) \
+		$(BOOTTEST_OBJS) $(PROGRAMS)

ZSTD/build.txt

+Build a static linked, small zstdcat tool
+
+======== Source Code ========
+use an old version of zstd
+https://codeload.github.com/facebook/zstd/zip/v1.0.0
+
+======== Build Envrioment ======== 
+build for 32bit, static linked with dietlibc
+1. install centos 6.10 i386 with CentOS-6.10-i386-bin-DVD1.iso
+2. yum install gcc gettext gettext-devel
+3. install dietc libc (just make && make install)
+4. export PATH=$PATH:/opt/diet/bin
+
+======== Build Step ======== 
+1. extract zstd source code
+2. cd programs
+3. diet -Os gcc -pipe -nostdinc         -falign-loops=32 -I../lib -I../lib/common -I../lib/dictBuilder -I../lib/legacy -O3 -Wall -Wextra -Wcast-qual -Wcast-align -Wshadow -Wstrict-aliasing=1 -Wswitch-enum -Wdeclaration-after-statement -Wstrict-prototypes -Wundef   -DZSTD_LEGACY_SUPPORT=1 ../lib/decompress/zstd_decompress.c -c -o ../lib/decompress/zstd_decompress.o
+   diet -Os gcc -pipe -nostdinc           -I../lib -I../lib/common -I../lib/dictBuilder -I../lib/legacy -O3 -Wall -Wextra -Wcast-qual -Wcast-align -Wshadow -Wstrict-aliasing=1 -Wswitch-enum -Wdeclaration-after-statement -Wstrict-prototypes -Wundef   -DZSTD_LEGACY_SUPPORT=1 ../lib/decompress/zstd_decompress.o ../lib/decompress/huf_decompress.c ../lib/common/entropy_common.c ../lib/common/fse_decompress.c ../lib/common/xxhash.c ../lib/common/zstd_common.c ../lib/compress/zstd_compress.c ../lib/compress/fse_compress.c ../lib/compress/huf_compress.c ../lib/legacy/zstd_v01.c ../lib/legacy/zstd_v02.c ../lib/legacy/zstd_v03.c ../lib/legacy/zstd_v04.c ../lib/legacy/zstd_v05.c ../lib/legacy/zstd_v06.c ../lib/legacy/zstd_v07.c ../lib/dictBuilder/divsufsort.c ../lib/dictBuilder/zdict.c zstdcli.c fileio.c bench.c datagen.c dibio.c -o zstd
+4. strip --strip-all zstd
+5. rename zstd to zstdcat

vtoyfat/fat_io_lib/README.txt

-========= About fat_io_lib =========
-1. Download fat_io_lib source code from http://ultra-embedded.com/releases/fat_io_lib.zip
-2. decompress the code and run buildlib.sh

vtoyfat/fat_io_lib/buildlib.sh

 #!/bin/sh
 
+if ! [ -f fat_io_lib.zip ]; then
+    echo "No fat_io_lib.zip found ..."
+    exit 1
+fi
+
+unzip fat_io_lib.zip
+
 rm -rf include
 rm -rf lib
 
+
 cd release
 gcc -O2 -D_FILE_OFFSET_BITS=64 fat*.c -c
 ar -rc libfat_io_64.a *.o