[Xenomai] multiple definition of `xenomai_main'

[Xenomai] multiple definition of `xenomai_main'

[Shen Felix]

Hi,
I am building Etherlab ethercat master application with RTDM interface.
The steps I used as follows:
step 1. Installing the Xenomai libraries and toolsA. get Xenomail release tarball: xenomai-3.0.1.tar.bz2B. building:$ export xenomai_root="/work/develop/xenomai-3.0.1"$ export build_root="/work/tmp/xenomai/build_root"$ mkdir $build_root/xenomai && cd $build_root/xenomai$ xenomai_root/configure CFLAGS="-march=armv7-a -mfpu=vfp3" LDFLAGS="-march=armv7-a -mfpu=vfp3" --build=i686-pc-linux-gnu --host=arm-linux-gnueabihf --with-core=cobalt$ make installNow, I got Xenomia libraries and tools under /usr/xenomai.So, I build application after got Xenomai libraries.

step 2. Building Etherlab(ethercat-1.5.2) softwareA. get and extract ethercat-1.5.2.tar.bz2B. building:$ export ethercatpath=/work/tmp/ethercat-hg$ export kernelpath=/work/develop/botbone_os_kernel$ export targetpath=${ethercatpath}/target/xenomai$ export xenomaipath=/usr/xenomaimkdir -p ${targetpath}cd ${ethercatpath}$ ./configure --with-devices=2 --enable-8139too=no --enable-generic=yes --enable-rtdm --with-xenomai-dir=${xenomaipath} --with-linux-dir=${kernelpath} CC=arm-linux-gnueabihf-gcc CXX=arm-linux-gnueabihf-g++ CPP=arm-linux-gnueabihf-cpp --host=arm-none-linux-gnueabi$ make 
But, I failed to compile the application and got error as follows:.../usr/xenomai/lib/xenomai/bootstrap.o: In function `__wrap_main':bootstrap.c:(.text+0x0): multiple definition of `xenomai_main'/usr/xenomai/lib/xenomai/bootstrap.o:bootstrap.c:(.text+0x0): first defined here/work/tmp/ethercat-hg/lib/.libs/libethercat_rtdm.so: undefined reference to `rt_dev_ioctl'/work/tmp/ethercat-hg/lib/.libs/libethercat_rtdm.so: undefined reference to `rt_dev_open'/work/tmp/ethercat-hg/lib/.libs/libethercat_rtdm.so: undefined reference to `rt_dev_close'collect2: error: ld returned 1 exit statusmake[4]: *** [ec_xenomai_example] Error 1make[4]: Leaving directory `/work/tmp/ethercat-hg/examples/xenomai'make[3]: *** [all-recursive] Error 1make[3]: Leaving directory `/work/tmp/ethercat-hg/examples'make[2]: *** [all] Error 2make[2]: Leaving directory `/work/tmp/ethercat-hg/examples'make[1]: *** [all-recursive] Error 1make[1]: Leaving directory `/work/tmp/ethercat-hg'make: *** [all] Error 2

I don't understand what happened because I just compiled source code.So, It's sure I make wrong setting for those two configure process.Or, I forgot to set any correct libraries path for compiling?Could anyone give me any suggestion for these errors?Thank you in advance.

Re: [Xenomai] multiple definition of `xenomai_main'

[Philippe Gerum]

On 10/10/2016 04:10 AM, Shen Felix wrote:
> Hi,
> I am building Etherlab ethercat master application with RTDM interface.
> The steps I used as follows:
> step 1. Installing the Xenomai libraries and toolsA. get Xenomail release tarball: xenomai-3.0.1.tar.bz2B. building:$ export xenomai_root="/work/develop/xenomai-3.0.1"$ export build_root="/work/tmp/xenomai/build_root"$ mkdir $build_root/xenomai && cd $build_root/xenomai$ xenomai_root/configure CFLAGS="-march=armv7-a -mfpu=vfp3" LDFLAGS="-march=armv7-a -mfpu=vfp3" --build=i686-pc-linux-gnu --host=arm-linux-gnueabihf --with-core=cobalt$ make installNow, I got Xenomia libraries and tools under /usr/xenomai.So, I build application after got Xenomai libraries.

Please use 3.0.3.

> 
> step 2. Building Etherlab(ethercat-1.5.2) softwareA. get and extract ethercat-1.5.2.tar.bz2B. building:$ export ethercatpath=/work/tmp/ethercat-hg$ export kernelpath=/work/develop/botbone_os_kernel$ export targetpath=${ethercatpath}/target/xenomai$ export xenomaipath=/usr/xenomaimkdir -p ${targetpath}cd ${ethercatpath}$ ./configure --with-devices=2 --enable-8139too=no --enable-generic=yes --enable-rtdm --with-xenomai-dir=${xenomaipath} --with-linux-dir=${kernelpath} CC=arm-linux-gnueabihf-gcc CXX=arm-linux-gnueabihf-g++ CPP=arm-linux-gnueabihf-cpp --host=arm-none-linux-gnueabi$ make 
> But, I failed to compile the application and got error as follows:.../usr/xenomai/lib/xenomai/bootstrap.o: In function `__wrap_main':bootstrap.c:(.text+0x0): multiple definition of `xenomai_main'/usr/xenomai/lib/xenomai/bootstrap.o:bootstrap.c:(.text+0x0): first defined here/work/tmp/ethercat-hg/lib/.libs/libethercat_rtdm.so: undefined reference to `rt_dev_ioctl'/work/tmp/ethercat-hg/lib/.libs/libethercat_rtdm.so: undefined reference to `rt_dev_open'/work/tmp/ethercat-hg/lib/.libs/libethercat_rtdm.so: undefined reference to `rt_dev_close'collect2: error: ld returned 1 exit statusmake[4]: *** [ec_xenomai_example] Error 1make[4]: Leaving directory `/work/tmp/ethercat-hg/examples/xenomai'make[3]: *** [all-recursive] Error 1make[3]: Leaving directory `/work/tmp/ethercat-hg/examples'make[2]: *** [all] Error 2make[2]: Leaving directory `/work/tmp/ethercat-hg/examples'make[1]: *** [all-recursive] Error 1make[1]: Leaving directory `/work/tmp/ethercat-hg'make: *** [all] Error 2
> 
> I don't understand what happened because I just compiled source code.So, It's sure I make wrong setting for those two configure process.Or, I forgot to set any correct libraries path for compiling?Could anyone give me any suggestion for these errors?Thank you in advance.
> 

It looks like the Ethercat build system was not updated for using
Xenomai 3.x, at least to enable the backward compatibility mode for
using the obsolete rt_dev_* API. The double definition of xenomai_main()
denotes an issue with the LDFLAGS.

-- 
Philippe.

Re: [Xenomai] multiple definition of `xenomai_main'

[Jack Lee]

On 10/10/2016 02:56 PM, Philippe Gerum wrote:
> On 10/10/2016 04:10 AM, Shen Felix wrote:
>> Hi,
>> I am building Etherlab ethercat master application with RTDM interface.
>> The steps I used as follows:
>> step 1. Installing the Xenomai libraries and toolsA. get Xenomail release tarball: xenomai-3.0.1.tar.bz2B. building:$ export xenomai_root="/work/develop/xenomai-3.0.1"$ export build_root="/work/tmp/xenomai/build_root"$ mkdir $build_root/xenomai && cd $build_root/xenomai$ xenomai_root/configure CFLAGS="-march=armv7-a -mfpu=vfp3" LDFLAGS="-march=armv7-a -mfpu=vfp3" --build=i686-pc-linux-gnu --host=arm-linux-gnueabihf --with-core=cobalt$ make installNow, I got Xenomia libraries and tools under /usr/xenomai.So, I build application after got Xenomai libraries.
> Please use 3.0.3.
>
>> step 2. Building Etherlab(ethercat-1.5.2) softwareA. get and extract ethercat-1.5.2.tar.bz2B. building:$ export ethercatpath=/work/tmp/ethercat-hg$ export kernelpath=/work/develop/botbone_os_kernel$ export targetpath=${ethercatpath}/target/xenomai$ export xenomaipath=/usr/xenomaimkdir -p ${targetpath}cd ${ethercatpath}$ ./configure --with-devices=2 --enable-8139too=no --enable-generic=yes --enable-rtdm --with-xenomai-dir=${xenomaipath} --with-linux-dir=${kernelpath} CC=arm-linux-gnueabihf-gcc CXX=arm-linux-gnueabihf-g++ CPP=arm-linux-gnueabihf-cpp --host=arm-none-linux-gnueabi$ make
>> But, I failed to compile the application and got error as follows:.../usr/xenomai/lib/xenomai/bootstrap.o: In function `__wrap_main':bootstrap.c:(.text+0x0): multiple definition of `xenomai_main'/usr/xenomai/lib/xenomai/bootstrap.o:bootstrap.c:(.text+0x0): first defined here/work/tmp/ethercat-hg/lib/.libs/libethercat_rtdm.so: undefined reference to `rt_dev_ioctl'/work/tmp/ethercat-hg/lib/.libs/libethercat_rtdm.so: undefined reference to `rt_dev_open'/work/tmp/ethercat-hg/lib/.libs/libethercat_rtdm.so: undefined reference to `rt_dev_close'collect2: error: ld returned 1 exit statusmake[4]: *** [ec_xenomai_example] Error 1make[4]: Leaving directory `/work/tmp/ethercat-hg/examples/xenomai'make[3]: *** [all-recursive] Error 1make[3]: Leaving directory `/work/tmp/ethercat-hg/examples'make[2]: *** [all] Error 2make[2]: Leaving directory `/work/tmp/ethercat-hg/examples'make[1]: *** [all-recursive] Error 1make[1]: Leaving directory `/work/tmp/ethercat-hg'make: *** [all] Error 2
>>
>> I don't understand what happened because I just compiled source code.So, It's sure I make wrong setting for those two configure process.Or, I forgot to set any correct libraries path for compiling?Could anyone give me any suggestion for these errors?Thank you in advance.
>>
> It looks like the Ethercat build system was not updated for using
> Xenomai 3.x, at least to enable the backward compatibility mode for
> using the obsolete rt_dev_* API. The double definition of xenomai_main()
> denotes an issue with the LDFLAGS.
>
Nice reply. I once downloaded an obsolete 2.x code file with rt_dev_*.
After modified to new ones and "--rtdm" was added to CFLAGS and LDFLAGS
in the makefile, compilation became ok.
Also, when xenomai was installed, a file named xenomai.conf or something 
else
with the content "$prefix/xenomai/lib" should be added to the 
/etc/ld.so.conf.d
directory and "ldconfig" should be run. Then the xenomai lib will be 
recognized.
To avoid mass display with the web-browser, you should edit your e-mail 
with a
mail client and use the plain text :)
Good trip with xenomai.