On 07.08.21 09:43, C Smith via Xenomai wrote:
> I can compile but not link my xenomai app. I get:
> /usr/bin/ld: skipping incompatible /usr/xenomai/lib/libtrank.so when
> searching for -ltrank
> /usr/bin/ld: skipping incompatible /usr/xenomai/lib/libcobalt.so when
> searching for -lcobalt
> etc.
>
> I am testing xenomai 3.1 with x86-64 bit kernel 4.19.89 (I am porting my
> xenomai 2.6 codebase to xeno 3.1). I have compiled the kernel OK with 32
> bit emulation support (CONFIG_IA32_EMULATION=y), as I must run my very
> large legacy xenomai 2.6 codebase as 32 bit. The xenomai testsuite
> latency, clocktest, switchtest apps run fine, BTW.
>
> Is the problem that the xenomai libs like cobalt are 64 bit only? Did I
> omit some xenomai configure option to support 32 bit xenomai apps ?
>
> Here is an example of the kind of gcc command line my Makefile puts out:
> gcc -g3 -m32 -I/usr/xenomai/include/trank -D__XENO_COMPAT__
> -I/usr/xenomai/include/cobalt -I/usr/xenomai/include -D_GNU_SOURCE
> -D_REENTRANT -fasynchronous-unwind-tables -D__COBALT__
> -I/usr/xenomai/include/alchemy -I/usr/include/libxml2
> -I/usr/xenomai/include/rtdm -I"../include/nanopb" -Xlinker -rpath
> -Xlinker /usr/xenomai/lib testapp.c ../modules/rtdinsync.h
> -Wl,--no-as-needed -ltrank -Wl,@/usr/xenomai/lib/modechk.wrappers -lalchemy
> -lcopperplate /usr/xenomai/lib/xenomai/bootstrap.o -Wl,--wrap=main
> -Wl,--dynamic-list=/usr/xenomai/lib/dynlist.ld -L/usr/xenomai/lib -lcobalt
> -lmodechk -lpthread -lrt -lfuse -pthread -Wl,--no-as-needed
> -Wl,@/usr/xenomai/lib/cobalt.wrappers
> -Wl,@/usr/xenomai/lib/modechk.wrappers
> /usr/xenomai/lib/xenomai/bootstrap.o -Wl,--wrap=main
> -Wl,--dynamic-list=/usr/xenomai/lib/dynlist.ld -L/usr/xenomai/lib -lcobalt
> -lmodechk -lpthread -lrt -lfuse -pthread -Wl,--no-as-needed
> -Wl,@/usr/xenomai/lib/cobalt.wrappers
> -Wl,@/usr/xenomai/lib/modechk.wrappers
> /usr/xenomai/lib/xenomai/bootstrap.o -Wl,--wrap=main
> -Wl,--dynamic-list=/usr/xenomai/lib/dynlist.ld -L/usr/xenomai/lib -lcobalt
> -lmodechk -lpthread -lrt -lfuse -pthread -lz -llzma -lm -ldl
> -Wl,--start-group -loshw -losal -Wl,--end-group -lm -o testapp
>
Xenomai userland works fine in 32-bit mode on x86, we do the same in
production. This is how I configure for 32-bit on my 64-bit machine:
/configure --host=i686-linux CFLAGS="-m32 -D_FILE_OFFSET_BITS=64" \
LDFLAGS=-m32 host_alias=i686-linux
Then you should be able to build just using the output of "xeno-config
--skin=... --cflags --ldflags".
That said, things are not nicely tested in upstream yet, see [1].
Jan
[1] https://gitlab.com/Xenomai/xenomai-hacker-space/-/issues/21
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