Has anyone tried to port Mono to RTEMS

xuelin.tian at qkmtech.com xuelin.tian at qkmtech.com
Fri Jul 21 03:10:06 UTC 2017 

Sorry about some missing information.
My host is ubuntu 14.4 (--host=x86_64-unknown-linux), and target is Zynq, ARM family (--target=arm-rtems4.11). 
I want to cross-compile Mono from source, downloaded from Github, the version is 4.8.1.0, not the HEAD. 

I think what you mean by build output is shown below:
=================================================
Running libtoolize...
libtoolize: putting auxiliary files in `.'.
libtoolize: copying file `./ltmain.sh'
libtoolize: putting macros in AC_CONFIG_MACRO_DIR, `m4'.
libtoolize: copying file `m4/libtool.m4'
libtoolize: copying file `m4/ltoptions.m4'
libtoolize: copying file `m4/ltsugar.m4'
libtoolize: copying file `m4/ltversion.m4'
libtoolize: copying file `m4/lt~obsolete.m4'
Running aclocal -I m4 -I .  ...
Running autoheader...
Running automake --gnu  ...
Running autoconf ...
Running libgc/autogen.sh ...
Running libtoolize...
libtoolize: putting auxiliary files in `.'.
libtoolize: copying file `./ltmain.sh'
libtoolize: putting macros in AC_CONFIG_MACRO_DIR, `m4'.
libtoolize: copying file `m4/libtool.m4'
libtoolize: copying file `m4/ltoptions.m4'
libtoolize: copying file `m4/ltsugar.m4'
libtoolize: copying file `m4/ltversion.m4'
libtoolize: copying file `m4/lt~obsolete.m4'
Running aclocal  -Wnone ...
Running automake --gnu  ...
Makefile.am:32: error: Libtool library used but 'LIBTOOL' is undefined
Makefile.am:32:   The usual way to define 'LIBTOOL' is to add 'LT_INIT'
Makefile.am:32:   to 'configure.ac' and run 'aclocal' and 'autoconf' again.
Makefile.am:32:   If 'LT_INIT' is in 'configure.ac', make sure
Makefile.am:32:   its definition is in aclocal's search path.
**Error**: automake failed.
Done running libgc/autogen.sh ...
Running eglib/autogen.sh ...
Running libtoolize...
libtoolize: putting macros in AC_CONFIG_MACRO_DIR, `m4'.
libtoolize: copying file `m4/libtool.m4'
libtoolize: copying file `m4/ltoptions.m4'
libtoolize: copying file `m4/ltsugar.m4'
libtoolize: copying file `m4/ltversion.m4'
libtoolize: copying file `m4/lt~obsolete.m4'
Running aclocal -I m4  ...
Running autoheader...
Running automake --gnu  ...
Running autoconf ...
Skipping configure process.
Done running eglib/autogen.sh ...
Running ./configure --enable-maintainer-mode --enable-compile-warnings --prefix=/opt/Mono/mono-4.8.1.0/mono-arm --target=arm-rtems4.11 --host=x86_64-unknown-linux CC=/opt/rtems-4.11.1-release/4.11-tools/bin/arm-rtems4.11-gcc CFLAGS=-qrtems -B/opt/rtems-4.11.1-release/4.11-bsp/arm-rtems4.11/lib -B/opt/rtems-4.11.1-release/4.11-bsp/arm-rtems4.11/xilinx_zynq_zedboard/lib/ -I//opt/rtems-4.11.1-release/4.11-bsp/arm-rtems4.11/xilinx_zynq_zedboard/lib/include --specs bsp_specs -march=armv7-a -mthumb -mfpu=neon -mfloat-abi=hard -mtune=cortex-a9 ...
checking build system type... x86_64-unknown-linux-gnu
checking host system type... x86_64-unknown-linux-gnu
checking target system type... arm-unknown-rtems4.11
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for x86_64-unknown-linux-strip... no
checking for strip... strip
checking for a thread-safe mkdir -p... /bin/mkdir -p
checking for gawk... no
checking for mawk... mawk
checking whether make sets $(MAKE)... yes
checking how to create a ustar tar archive... gnutar
checking whether to enable maintainer-specific portions of Makefiles... yes
checking whether ln -s works... yes
checking whether make supports nested variables... yes
checking host platform characteristics... ok
checking for x86_64-unknown-linux-gcc... /opt/rtems-4.11.1-release/4.11-tools/bin/arm-rtems4.11-gcc
checking for x86_64-unknown-linux-gcc... (cached) /opt/rtems-4.11.1-release/4.11-tools/bin/arm-rtems4.11-gcc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables... 
checking whether we are cross compiling... yes
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether /opt/rtems-4.11.1-release/4.11-tools/bin/arm-rtems4.11-gcc accepts -g... yes
checking for /opt/rtems-4.11.1-release/4.11-tools/bin/arm-rtems4.11-gcc option to accept ISO C89... none needed
checking for style of include used by make... GNU
checking dependency style of /opt/rtems-4.11.1-release/4.11-tools/bin/arm-rtems4.11-gcc... gcc3
checking for x86_64-unknown-linux-g++... no
checking for g++... g++
configure: WARNING: using cross tools not prefixed with host triplet
checking whether we are using the GNU C++ compiler... yes
checking whether g++ accepts -g... yes
checking dependency style of g++... gcc3
checking dependency style of /opt/rtems-4.11.1-release/4.11-tools/bin/arm-rtems4.11-gcc... gcc3
checking for gawk... (cached) mawk
checking whether /opt/rtems-4.11.1-release/4.11-tools/bin/arm-rtems4.11-gcc and cc understand -c and -o together... yes
checking how to run the C preprocessor... /opt/rtems-4.11.1-release/4.11-tools/bin/arm-rtems4.11-gcc -E
checking for grep that handles long lines and -e... /bin/grep
checking for egrep... /bin/grep -E
checking for ANSI C header files... yes
checking how to print strings... printf
checking for a sed that does not truncate output... /bin/sed
checking for fgrep... /bin/grep -F
checking for ld used by /opt/rtems-4.11.1-release/4.11-tools/bin/arm-rtems4.11-gcc... /opt/rtems-4.11.1-release/4.11-tools/arm-rtems4.11/bin/ld
checking if the linker (/opt/rtems-4.11.1-release/4.11-tools/arm-rtems4.11/bin/ld) is GNU ld... yes
checking for BSD- or MS-compatible name lister (nm)... /usr/bin/nm -B
checking the name lister (/usr/bin/nm -B) interface... BSD nm
checking the maximum length of command line arguments... 1572864
checking whether the shell understands some XSI constructs... yes
checking whether the shell understands "+="... yes
checking how to convert x86_64-unknown-linux-gnu file names to x86_64-unknown-linux-gnu format... func_convert_file_noop
checking how to convert x86_64-unknown-linux-gnu file names to toolchain format... func_convert_file_noop
checking for /opt/rtems-4.11.1-release/4.11-tools/arm-rtems4.11/bin/ld option to reload object files... -r
checking for x86_64-unknown-linux-objdump... objdump
checking how to recognize dependent libraries... pass_all
checking for x86_64-unknown-linux-dlltool... dlltool
checking how to associate runtime and link libraries... printf %s\n
checking for x86_64-unknown-linux-ar... no
checking for ar... ar
checking for archiver @FILE support... @
checking for x86_64-unknown-linux-strip... strip
checking for x86_64-unknown-linux-ranlib... no
checking for ranlib... ranlib
checking command to parse /usr/bin/nm -B output from /opt/rtems-4.11.1-release/4.11-tools/bin/arm-rtems4.11-gcc object... ok
checking for sysroot... no
checking for x86_64-unknown-linux-mt... no
checking for mt... mt
checking if mt is a manifest tool... no
checking for sys/types.h... yes
checking for sys/stat.h... yes
checking for stdlib.h... yes
checking for string.h... yes
checking for memory.h... yes
checking for strings.h... yes
checking for inttypes.h... yes
checking for stdint.h... yes
checking for unistd.h... yes
checking for dlfcn.h... yes
checking for objdir... .libs
checking if /opt/rtems-4.11.1-release/4.11-tools/bin/arm-rtems4.11-gcc supports -fno-rtti -fno-exceptions... no
checking for /opt/rtems-4.11.1-release/4.11-tools/bin/arm-rtems4.11-gcc option to produce PIC... -fPIC -DPIC
checking if /opt/rtems-4.11.1-release/4.11-tools/bin/arm-rtems4.11-gcc PIC flag -fPIC -DPIC works... yes
checking if /opt/rtems-4.11.1-release/4.11-tools/bin/arm-rtems4.11-gcc static flag -static works... yes
checking if /opt/rtems-4.11.1-release/4.11-tools/bin/arm-rtems4.11-gcc supports -c -o file.o... yes
checking if /opt/rtems-4.11.1-release/4.11-tools/bin/arm-rtems4.11-gcc supports -c -o file.o... (cached) yes
checking whether the /opt/rtems-4.11.1-release/4.11-tools/bin/arm-rtems4.11-gcc linker (/opt/rtems-4.11.1-release/4.11-tools/arm-rtems4.11/bin/ld -m elf_i386) supports shared libraries... no
checking dynamic linker characteristics... GNU/Linux ld.so
checking how to hardcode library paths into programs... unsupported
checking whether stripping libraries is possible... yes
checking if libtool supports shared libraries... no
checking whether to build shared libraries... no
checking whether to build static libraries... yes
checking how to run the C++ preprocessor... g++ -E
checking for ld used by g++... /opt/rtems-4.11.1-release/4.11-tools/arm-rtems4.11/bin/ld -m elf_i386
checking if the linker (/opt/rtems-4.11.1-release/4.11-tools/arm-rtems4.11/bin/ld -m elf_i386) is GNU ld... no
checking whether the g++ linker (/opt/rtems-4.11.1-release/4.11-tools/arm-rtems4.11/bin/ld -m elf_i386) supports shared libraries... yes
checking for g++ option to produce PIC... -fPIC -DPIC
checking if g++ PIC flag -fPIC -DPIC works... yes
checking if g++ static flag -static works... yes
checking if g++ supports -c -o file.o... yes
checking if g++ supports -c -o file.o... (cached) yes
checking whether the g++ linker (/opt/rtems-4.11.1-release/4.11-tools/arm-rtems4.11/bin/ld -m elf_i386) supports shared libraries... yes
checking dynamic linker characteristics... (cached) GNU/Linux ld.so
checking how to hardcode library paths into programs... unsupported
checking for bash... /bin/bash
checking if dolt supports this host... yes, replacing libtool
checking for ld used by /opt/rtems-4.11.1-release/4.11-tools/bin/arm-rtems4.11-gcc... (cached) /opt/rtems-4.11.1-release/4.11-tools/arm-rtems4.11/bin/ld
checking if the linker (/opt/rtems-4.11.1-release/4.11-tools/arm-rtems4.11/bin/ld) is GNU ld... (cached) yes
checking for ld used by GCC... /opt/rtems-4.11.1-release/4.11-tools/arm-rtems4.11/bin/ld
checking if the linker (/opt/rtems-4.11.1-release/4.11-tools/arm-rtems4.11/bin/ld) is GNU ld... yes
checking for shared library run path origin... done
checking for iconv... yes
checking for working iconv... guessing yes
checking for iconv declaration... 
         extern size_t iconv (iconv_t cd, char * *inbuf, size_t *inbytesleft, char * *outbuf, size_t *outbytesleft);
checking sys/filio.h usability... yes
checking sys/filio.h presence... no
configure: WARNING: sys/filio.h: accepted by the compiler, rejected by the preprocessor!
configure: WARNING: sys/filio.h: proceeding with the compiler's result
checking for sys/filio.h... yes
checking sys/sockio.h usability... yes
checking sys/sockio.h presence... no
configure: WARNING: sys/sockio.h: accepted by the compiler, rejected by the preprocessor!
configure: WARNING: sys/sockio.h: proceeding with the compiler's result
checking for sys/sockio.h... yes
checking netdb.h usability... no
checking netdb.h presence... no
checking for netdb.h... no
checking utime.h usability... yes
checking utime.h presence... yes
checking for utime.h... yes
checking sys/utime.h usability... yes
checking sys/utime.h presence... yes
checking for sys/utime.h... yes
checking semaphore.h usability... yes
checking semaphore.h presence... yes
checking for semaphore.h... yes
checking sys/un.h usability... no
checking sys/un.h presence... no
checking for sys/un.h... no
checking linux/rtc.h usability... no
checking linux/rtc.h presence... no
checking for linux/rtc.h... no
checking sys/syscall.h usability... no
checking sys/syscall.h presence... no
checking for sys/syscall.h... no
checking sys/mkdev.h usability... no
checking sys/mkdev.h presence... no
checking for sys/mkdev.h... no
checking sys/uio.h usability... yes
checking sys/uio.h presence... no
configure: WARNING: sys/uio.h: accepted by the compiler, rejected by the preprocessor!
configure: WARNING: sys/uio.h: proceeding with the compiler's result
checking for sys/uio.h... yes
checking sys/param.h usability... yes
checking sys/param.h presence... yes
checking for sys/param.h... yes
checking sys/sysctl.h usability... no
checking sys/sysctl.h presence... no
checking for sys/sysctl.h... no
checking libproc.h usability... no
checking libproc.h presence... no
checking for libproc.h... no
checking sys/prctl.h usability... no
checking sys/prctl.h presence... no
checking for sys/prctl.h... no
checking for sys/param.h... (cached) yes
checking sys/socket.h usability... no
checking sys/socket.h presence... no
checking for sys/socket.h... no
checking sys/ipc.h usability... no
checking sys/ipc.h presence... no
checking for sys/ipc.h... no
checking sys/utsname.h usability... yes
checking sys/utsname.h presence... no
configure: WARNING: sys/utsname.h: accepted by the compiler, rejected by the preprocessor!
configure: WARNING: sys/utsname.h: proceeding with the compiler's result
checking for sys/utsname.h... yes
checking alloca.h usability... yes
checking alloca.h presence... yes
checking for alloca.h... yes
checking ucontext.h usability... no
checking ucontext.h presence... no
checking for ucontext.h... no
checking pwd.h usability... yes
checking pwd.h presence... yes
checking for pwd.h... yes
checking sys/select.h usability... no
checking sys/select.h presence... no
checking for sys/select.h... no
checking netinet/tcp.h usability... no
checking netinet/tcp.h presence... no
checking for netinet/tcp.h... no
checking netinet/in.h usability... no
checking netinet/in.h presence... no
checking for netinet/in.h... no
checking for unistd.h... (cached) yes
checking for sys/types.h... (cached) yes
checking link.h usability... yes
checking link.h presence... no
configure: WARNING: link.h: accepted by the compiler, rejected by the preprocessor!
configure: WARNING: link.h: proceeding with the compiler's result
checking for link.h... yes
checking asm/sigcontext.h usability... no
checking asm/sigcontext.h presence... no
checking for asm/sigcontext.h... no
checking sys/inotify.h usability... no
checking sys/inotify.h presence... no
checking for sys/inotify.h... no
checking arpa/inet.h usability... no
checking arpa/inet.h presence... no
checking for arpa/inet.h... no
checking complex.h usability... yes
checking complex.h presence... yes
checking for complex.h... yes
checking unwind.h usability... yes
checking unwind.h presence... yes
checking for unwind.h... yes
checking for linux/netlink.h... no
checking for linux/rtnetlink.h... no
checking for sys/user.h... no
checking linux/serial.h usability... no
checking linux/serial.h presence... no
checking for linux/serial.h... no
checking zlib.h usability... yes
checking zlib.h presence... no
configure: WARNING: zlib.h: accepted by the compiler, rejected by the preprocessor!
configure: WARNING: zlib.h: proceeding with the compiler's result
checking for zlib.h... yes
Using system zlib
checking elf.h usability... no
checking elf.h presence... no
checking for elf.h... no
checking poll.h usability... no
checking poll.h presence... no
checking for poll.h... no
checking sys/poll.h usability... yes
checking sys/poll.h presence... no
configure: WARNING: sys/poll.h: accepted by the compiler, rejected by the preprocessor!
configure: WARNING: sys/poll.h: proceeding with the compiler's result
checking for sys/poll.h... yes
checking sys/wait.h usability... yes
checking sys/wait.h presence... yes
checking for sys/wait.h... yes
checking grp.h usability... yes
checking grp.h presence... yes
checking for grp.h... yes
checking syslog.h usability... no
checking syslog.h presence... no
checking for syslog.h... no
checking wchar.h usability... yes
checking wchar.h presence... yes
checking for wchar.h... yes
checking ieeefp.h usability... yes
checking ieeefp.h presence... yes
checking for ieeefp.h... yes
checking for isinf... yes
checking for _finite... no
checking for _finite in math.h... no
checking linux/magic.h usability... no
checking linux/magic.h presence... no
checking for linux/magic.h... no
checking size of void *... 4
checking for clang... no
checking for -Wno-unused-but-set-variable option to gcc... yes
checking whether NLS is requested... profile_default
checking for msgfmt... /usr/bin/msgfmt
checking for gmsgfmt... /usr/bin/msgfmt
checking for xgettext... /usr/bin/xgettext
checking for msgmerge... /usr/bin/msgmerge
checking for pkg-config... /usr/bin/pkg-config
checking for -mno-tls-direct-seg-refs option to gcc... no
yes
checking for visibility __attribute__... yes
checking whether /opt/rtems-4.11.1-release/4.11-tools/bin/arm-rtems4.11-gcc supports zero length arrays... yes
checking nacl/nacl_dyncode.h usability... no
checking nacl/nacl_dyncode.h presence... no
checking for nacl/nacl_dyncode.h... no
checking signal.h usability... yes
checking signal.h presence... yes
checking for signal.h... yes
checking for sigaction... yes
checking for kill... yes
checking for signal... yes
checking for library containing clock_gettime... none required
checking for clock_nanosleep... no
checking for dlopen... yes
checking for preceeding underscore in symbols... (cached) no
checking for dlerror... yes
checking execinfo.h usability... no
checking execinfo.h presence... no
checking for execinfo.h... no
checking sys/auxv.h usability... no
checking sys/auxv.h presence... no
checking for sys/auxv.h... no
checking sys/resource.h usability... yes
checking sys/resource.h presence... yes
checking for sys/resource.h... yes
checking for getgrgid_r... yes
checking for getgrnam_r... yes
checking for getpwnam_r... yes
checking for getpwuid_r... yes
checking for getresuid... no
checking for setresuid... no
checking for kqueue... no
checking for backtrace_symbols... no
checking for mkstemp... yes
checking for mmap... yes
checking for madvise... no
checking for getrusage... yes
checking for getpriority... no
checking for setpriority... no
checking for dl_iterate_phdr... no
checking for dladdr... no
checking for sysconf... yes
checking for getrlimit... no
checking for prctl... no
checking for sched_getaffinity... no
checking for sched_setaffinity... no
checking for sched_getcpu... no
checking for sched_setaffinity from glibc < 2.3.4... yes
checking if off_t is 64 bits wide... ok
checking for socket in -lsocket... no
checking for MSG_NOSIGNAL... no
checking for IPPROTO_IP... no
checking for IPPROTO_IPV6... no
checking for IPPROTO_TCP... no
checking for SOL_IP... no
checking for SOL_IPV6... no
checking for SOL_TCP... no
checking for IP_PKTINFO... no
checking for IPV6_PKTINFO... no
checking for IP_DONTFRAG... no
checking for IP_DONTFRAGMENT... no
checking for IP_MTU_DISCOVER... no
checking for IP_PMTUDISC_DO... no
checking for struct ip_mreqn... no
checking for struct ip_mreq... no
checking for getaddrinfo... no
checking for gethostbyname2_r... no
checking for gethostbyname2... no
checking for gethostbyname... no
checking for getprotobyname... no
checking for getnameinfo... no
checking for inet_ntop... no
checking for gethostbyaddr... no
checking for gethostbyaddr in -lnsl... no
checking for inet_pton... no
checking for inet_aton... no
checking for main in -lpthread... no
checking pthread.h usability... yes
checking pthread.h presence... yes
checking for pthread.h... yes
checking pthread_np.h usability... no
checking pthread_np.h presence... no
checking for pthread_np.h... no
checking for pthread_mutex_timedlock... yes
checking for pthread_getattr_np... yes
checking for pthread_attr_get_np... no
checking for pthread_setname_np... no
checking for pthread_kill... yes
checking for PTHREAD_MUTEX_RECURSIVE... ok
checking for pthread_attr_setstacksize... yes
checking for pthread_attr_getstack... yes
checking for pthread_attr_getstacksize... yes
checking for pthread_get_stacksize_np... no
checking for pthread_get_stackaddr_np... no
checking for mincore... no
checking for working __thread... cross compiling
checking for working sigaltstack... cross compiling
checking for library containing sem_init... none required
checking for library containing shm_open... no
checking for shm_open... no
checking for tm_gmtoff in struct tm... no
checking for timezone variable... no
configure: error: unable to find a way to determine timezone
===============================================
I googled the time zone variable, and still working on it.

But actually, I want to know whether I am doing it the right way? I mean, is this a right way to port Mono to RTEMS, just modifying some configuration options? I am still confusing about it. 



Best wishes,
xuelin.tian at qkmtech.com
 
From: Russell Haley
Date: 2017-07-21 10:42
To: xuelin.tian at qkmtech.com
CC: Joel Sherrill; users at rtems.org
Subject: Re: Re: Has anyone tried to port Mono to RTEMS

On Thu, Jul 20, 2017 at 7:07 PM, xuelin.tian at qkmtech.com <xuelin.tian at qkmtech.com> wrote:
I just followed the instructions from Mono, and did some changes obviously.
I did not use ScratchBox to cross-compile my Mono on ARM, just use arm-rtems4.11-gcc to cross-compile it. Is that right?
Do I need to modify the source code from Mono to port to RTEMS?
Some context you really should provide:
- What platform are you building on?
- Where did you get the source files? (if git, are you building head? I have had many problems building mono from head)
- Without posting your complete build output there is no way to tell what is happening. 

This is just a shot in the dark, but did you google Time Zone variable? Google says you need to set a TZ environment variable. 

Russ


Best wishes,
xuelin.tian at qkmtech.com
 
From: Russell Haley
Date: 2017-07-21 00:16
To: xuelin.tian; Joel Sherrill
CC: users
Subject: Re: Has anyone tried to port Mono to RTEMS
Did you get it to build natively?‎ What is your host. Build output would be helpful. 

Russ

Sent from my BlackBerry 10 smartphone on the Virgin Mobile network.
From: xuelin.tian at qkmtech.com
Sent: Thursday, July 20, 2017 5:53 AM
To: Russell Haley; Joel Sherrill
Cc: users at rtems.org
Subject: Re: Re: Has anyone tried to port Mono to RTEMS

I have been struck by it for like 2 days.
I want to cross-compile Mono for a test, and I enter: 

./autogen.sh --prefix=/opt/Mono/mono-4.8.1.0/mono-arm --target=arm-rtems4.11 --host=x86_64-unknown-linux CC=/opt/rtems-4.11.1-release/4.11-tools/bin/arm-rtems4.11-gcc CFLAGS="-qrtems -B/opt/rtems-4.11.1-release/4.11-bsp/arm-rtems4.11/lib -B/opt/rtems-4.11.1-release/4.11-bsp/arm-rtems4.11/xilinx_zynq_zedboard/lib/ -I//opt/rtems-4.11.1-release/4.11-bsp/arm-rtems4.11/xilinx_zynq_zedboard/lib/include --specs bsp_specs -march=armv7-a -mthumb -mfpu=neon -mfloat-abi=hard -mtune=cortex-a9"

It goes well at first, then the error came up:
checking for timezone variable... no
configure: error: unable to find a way to determine timezone

I can not really understand the content from config.log

Can anyone help me with this? Thanks a lot



Best wishes,
xuelin.tian at qkmtech.com
 
From: Russell Haley
Date: 2017-07-14 12:44
To: xuelin.tian; Joel Sherrill
CC: users
Subject: Re: Has anyone tried to port Mono to RTEMS
Thinking about it, Lua is designed to be statically linked into C applications and your scripts are loaded and executed by your application at runtime. This is how lua is plugged into many video games like world or warcraft and roblox. 

From my simplistic understanding of rtems (and everything I just said), that would be the way you would statically link lua into rtems?

Russ

Sent from my BlackBerry 10 smartphone on the Virgin Mobile network.
From: xuelin.tian at qkmtech.com
Sent: Thursday, July 13, 2017 9:03 PM
To: Russell Haley; Joel Sherrill
Cc: users at rtems.org
Subject: Re: Re: Has anyone tried to port Mono to RTEMS

OK, thanks a lot.
I will go through Lua today, to see if there is something interesting there.



Best wishes,
xuelin.tian at qkmtech.com
 
From: Russell Haley
Date: 2017-07-14 11:57
To: xuelin.tian; Joel Sherrill
CC: users
Subject: Re: Has anyone tried to port Mono to RTEMS
Just my opinion on the 'or other vm' comment. 

If your requirement is not strictly mono, I highly suggest something small and simple like Lua. It's a a very efficient vm and is cross compatible with all major platforms. The only requirement for Lua is c99. 

The language is very simple and bare bones. You pick your tools from git or a repository manager called luarocks (luarocks.org). That's where the 'hard part' of Lua comes in. It's very hands on because you need to find or write almost everything you need. 

I am putting together a 'lightweight' IoT platform using Lua 5.3 and a very sophisticated polling library called cqueues. There is an http library called lua-http based on cqueues that contains a client and server implementation of most major http standards including http2 and websockets. The requirements for cqueues are a polling library such as epoll or kqueues (or even poll or select). I'm not sure how well that would plug into rtems. ‎At this point I'm cross compatible for most major Nixs' though. 

Nonetheless, the overhead of mono is not really worth it if you are doing simple things. ‎That's why I switched away from DotNet for my project. If you have code to port, or have DotNet developers, mono makes sense. 

‎Just my opinion. 

HTH
Russ

Sent from my BlackBerry 10 smartphone on the Virgin Mobile network.
From: xuelin.tian at qkmtech.com
Sent: Thursday, July 13, 2017 8:38 PM
To: Joel Sherrill; Russell Haley
Cc: users at rtems.org
Subject: Re: Re: Has anyone tried to port Mono to RTEMS

Yes, I am trying to build it from source according to Russell.

As to .net core, I may not have a deep understanding of it. I think for now, Mono may be the best choice for me, since I need to make it (porting Mono or other VM to rtems) work in a few days. 



Best wishes,
xuelin.tian at qkmtech.com
 
From: Joel Sherrill
Date: 2017-07-13 01:08
To: Russell Haley
CC: xuelin.tian at qkmtech.com; users at rtems.org
Subject: Re: Re: Has anyone tried to port Mono to RTEMS
The reply from Russell is very good advice. Look forward when porting and
make sure you are porting something with a future.

For Mono, I did exactly what he outlined. I built native. I recall it using a 
fairly normal configure script and I just added --target=XXX-rtems. I might
have added some CFLAGS but don't recall. 

I focused on the run-time interpreter and ignored the JIT. The run-time
translated Mono calls into C library and POSIX calls. If there was a 
compilation issue, I tried to fix it where ever it had to be fixed. Always being
open to adding something to either RTEMS or newlib if possible
and needed.

--joel

On Wed, Jul 12, 2017 at 11:03 AM, Russell Haley <russ.haley at gmail.com> wrote:
On Tue, Jul 11, 2017 at 9:31 PM, xuelin.tian at qkmtech.com
<xuelin.tian at qkmtech.com> wrote:
> Dear Joel,
> Recently, I continue to port Mono to RTEMS.
> Porting consists of two parts, according to the Mono documents online, JIT
> engine and OS support.
> JIT part is already done, since I use ARM platform.
> And I am confuesd about OS part and how to build Mono on RTEMS.
> Could you recall any details about how to build Mono on RTEMS? Thank you.

I'm not sure that's quite right. There are really 3 parts: The
application framework, the 'JIT' (Mono Runtime, or Common Language
Runtime in Microsoft .Net) and the OS specific layer. The application
framework and the JIT are common to all platforms. The OS specific
parts are in the Mono Runtime where it translates the Interediate
Language (IL) to machine specific code at ... er ... runtime. The Mono
Runtime is being slowly replaced by the Roslyn compiler, which is open
source from Microsoft (very very cool stuff).

Building Mono requires a number of parts, including boot strapping the
build and downloading binaries from nuget (last time I did it,
anyway). I've never attempted to cross compile Mono. I would assume
you would change the make file to point to a cross compiler such as
arm-unknown-gcc (not sure about the RTEMS specifics).

In my opinion the best bet is to pull the mono repository from GitHub
and build it for your host platform first. Then you could look at
modifying it to build on arm.

That said, Mono is a dead/dying platform. Microsoft has bought
Xamarian (Mono sponsor company). Now the Mono Dev Team is slowly
porting everything over to the Microsoft .Net Core code. Once the
majority of libraries are converted, they can then write Mono specific
modules for legacy applications and then shuffle everyone over to
DotNet Core. It might be wise to look at using the DotNet Core instead
of Mono. There are a number of reasons to prefer the DotNet Core:

- Designed to be small and use a package manager to import required
external libraries. This was done with embedded systems in mind.
- Better interpreter: the new interpreters (Rosylin and the other that
I don't remember the name of) are very efficient compared to the Mono
mc.
- More efficient runtime. The Mono Runtime is known to be slow.

 Here would be a good place to start with the DotNet Core as they have
nightly arm builds.

https://stevedesmond.ca/blog/net-core-on-arm


HTH,

Russ

> ________________________________
> Best wishes,
> xuelin.tian at qkmtech.com
>
>
> From: Joel Sherrill
> Date: 2017-05-24 20:19
> To: xuelin.tian
> CC: rtems-users at rtems.org
> Subject: Re: Has anyone tried to port Mono to RTEMS
>
>
> On May 23, 2017 8:58 PM, "xuelin.tian at qkmtech.com" <xuelin.tian at qkmtech.com>
> wrote:
>
> Dear all,
> Is that possible to port Mono to RTEMS? Has anyone tried this before?
> As I notice that there is an open project in RTEMS projects.
>
>
> Sometime ago, I was asked to provide an estimate for this. It had to be
> between five and ten years ago because we were at the old office but after
> we had done a few years of GSoC. I did enough work preparing the estimate
> where I had the code building without too much effort. I saw the challenge
> as getting the test suite running since you would have to create a test
> harness and build/assembly helper that packaged the interpreted code with
> the interpreter in order to run it. At that time, I envisioned having to
> create a base image and a filesystem image per test.
>
> Our POSIX was good enough then to avoid much trouble. It should only be
> easier now since the POSIX support has improved.
>
> There were a lot of Mono tests and I expected most to pass quickly. But
> there was no way to know how many issues would be encountered and how many
> root causes there would be. I expected to fix one or two things and then run
> all the tests. That was where I expected time to be consumed.
>
> FWIW I recall the GSoC date part because they thought we could magically get
> students to do testing for free on a schedule. :)
>
> I hope that helps. It is feasible but the key is testing.
>
> --joel
>
>
> ________________________________
> Best wishes,
> xuelin.tian at qkmtech.com
>
> _______________________________________________
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> users at rtems.org
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