build.txt

Build a static linked, small dmsetup tool

======== Source Code ========
use an old version of dmsetup
xxx/centos-vault/5.3/os/SRPMS/device-mapper-1.02.28-2.el5.src.rpm

======== 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 kernel-devel package
3. install dietc libc (just make && make install)
4. export PATH=$PATH:/opt/diet/bin

======== Build Step ======== 
1. extract device mapper source code
2. CC="diet gcc" ./configure --disable-nls  --disable-selinux --disable-shared
3. modify include/configure.h file
   --- delete the line with "#define malloc rpl_malloc"
   --- add 2 defines as follow:
       #ifndef UINT32_MAX
       #define UINT32_MAX  (4294967295U)
       #endif
       
       #ifndef UINT64_C
       #define UINT64_C(c) c ## ULL
       #endif
   
4. make
5. strip dmsetup/dmsetup
5. get dmsetup/dmsetup as the binary file