Forum Discussion
Honored ContributorC++ on uClinux on Nios II ?
Can you use C++ on uClinux on Nios II? I tried building the C++ test application available in menuconfig, but STL doesn't build:
Code:
Do I need to install something else to get pthread support? What about the other errors? Has anybody had any luck building other C++ libraries or applications?
10 Replies
Altera_ForumAFAIK, with NIOS2-nommu, you can use C++ but you can't use shared libraries (what you seemingly want to do as your "dll" naming suggests). Before trying to port an application you should first try to compile and run a simple "hallo world" c++ program .
With NIOS2-mmu you can use shared libraries. While I did not yet try c++ and did not try to create a shared library or a program that uses one, I did try to do threads via the pthread library. With NIOS2-nommu this does work, but the debugger does not support threads. Moreover the compiler does not support the "__thread" keywords (static thread specific varibles). Both issues hould be solved with the NIOS2-mmu distribution. -Michael- Altera_Forum
The C++ is supported on nios2. But I build the applicaiotn without the menuconfig, I build the applicaiotn with my Makefile. I have build the MiniGUI and C++ applicaiotn.make: Entering directory `/data/nios/nios2-linux/uClinux-dist/lib/STLport/build/lib' nios2-linux-uclibc-g++ -pthread -fexceptions -fident -fPIC -O2 -fuse-cxa-atexit -D_STLP_REAL_LOCALE_IMPLEMENTED -D_GNU_SOURCE -I/data/nios/nios2-linux/uClinux-dist/include/STLport -I/data/nios/nios2-linux/uClinux-dist/include -c -o obj/gcc/shared/dll_main.o ../../src/dll_main.cpp-pthread or -lpthread ??? - Altera_Forum
I changed -pthread to -lpthread and no longer get that error, but there are still the not found includes
- Altera_Forum
Fixed includes and a couple of other things in STLport, now on to compiling and linking helloworld:
and so on...make: Entering directory `/data/nios/nios2-linux/uClinux-dist/user/cxxtest/helloworld' nios2-linux-uclibc-g++ -L/data/nios/nios2-linux/uClinux-dist/lib/STLport/lib -o cxx_helloworld helloworld.o -lm -Wl,-Bstatic -lstdc++ -Wl,-Bdynamic helloworld.o(.text+0x20): In function `std::__verify_grouping(char const*, unsigned long, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)': : undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::size() const' helloworld.o(.text+0x80): In function `std::__verify_grouping(char const*, unsigned long, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)': : undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::operator(unsigned long) const' helloworld.o(.text+0xdc): In function `std::__verify_grouping(char const*, unsigned long, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)': : undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::operator(unsigned long) const' helloworld.o(.text+0x114): In function `std::__verify_grouping(char const*, unsigned long, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)': : undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::operator(unsigned long) const' helloworld.o(.text+0x188): In function `main': : undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)' /data/nios/nios2-linux/uClinux-dist/lib/STLport/lib/libstdc++.a(iostream.o)(.text+0x3b8): In function `std::_Stl_create_wfilebuf(__STDIO_FILE_STRUCT*, int)': : undefined reference to `__gxx_personality_sj0' - Altera_Forum
STLport is not needed and the cxxtest apps is not ported. You can build the c++ apps with simply,
nios2-linux-uclibc-g++ helloworld.cxx -o helloworld -elf2flt - Hippo - Altera_Forum
<div class='quotetop'>QUOTE (hippo @ Sep 1 2009, 12:32 AM) <{post_snapback}> (index.php?act=findpost&pid=23713)</div>
--- Quote Start --- STLport is not needed and the cxxtest apps is not ported. You can build the c++ apps with simply, nios2-linux-uclibc-g++ helloworld.cxx -o helloworld -elf2flt - Hippo[/b] --- Quote End --- Is STL already in the toolchain then? Is there any advantage to using STLport now that I do have it built (sort of, trouble linking the app as above)? - Altera_Forum
<div class='quotetop'>QUOTE (tehfury87 @ Sep 1 2009, 09:50 PM) <{post_snapback}> (index.php?act=findpost&pid=23724)</div>
--- Quote Start --- Is STL already in the toolchain then? Is there any advantage to using STLport now that I do have it built (sort of, trouble linking the app as above)?[/b] --- Quote End --- No. STL is not used in the toolchain. We use libstdc++ come with gcc. I don't know if there is any advantage to use STLport. - Hippo - Altera_Forum--- Quote Start --- Can you use C++ on uClinux on Nios II? I tried building the C++ test application available in menuconfig, but STL doesn't build: Do I need to install something else to get pthread support? What about the other errors? Has anybody had any luck building other C++ libraries or applications? --- Quote End --- He have successfully developed a large application which uses STL extensively, especially container templates. However, we weren't able to compile even the simplest application with C++ and pthreads combined. Cheers, Ricardo.
- Altera_Forum
I would suggest MMU enabled Linux if you want to try C++ and pthread.
http://www.nioswiki.com/linux - Hippo - Altera_Forum
FWIW, I had a fairly large C++ library and application that uses pthreads working on no-MMU uClinux.
I am now using an MMU and having some new problems though -- started a new thread because it's a completely new problem: http://www.alteraforum.com/forum/showthread.php?t=20152.
