[Xenomai-core] [PATCH]Build xenomai on Blackfin in FDPIC format

[Xenomai-core] [PATCH]Build xenomai on Blackfin in FDPIC format

[Li Yi (Adam)]

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Hi Philippe,

Since bfin-gcc release 2006-R1, bfin-gcc begins to support "FDPIC" format
besides "BFLT".
"FDPIC" supports shared library. Bellow patch makes it possible to build
xenomai-2.2.5 in FDPIC
format. In docs.blackfin.uclinux.org/doku.php?id=adeos there is step by step
guide.

Although it is still possible to build xenomai as BFLT in this way:

configure --host=bfin CC=bfin-uclinux-gcc LDFLAGS=-Wl,-elf2flt
--disable-shared

There will be error:

 bfin-uclinux-gcc -Wl,-elf2flt -o cyclictest
-Wl,@/home/adam/workspace/xenomai/xenomai_src/xenomai-2.2.5/src/skins/posix/posix.wrappers
cyclictest-cyclictest.o  ../../skins/posix/.libs/libpthread_rt.a -lpthread
-lrt
/home/adam/workspace/toolchain/1110/bfin-uclinux/bin/../lib/gcc/bfin-uclinux/4.1.1/../../../../bfin-uclinux/lib/libpthread.a(
specific.o): In function `_pthread_key_delete':
(.text+0x24e): undefined reference to `___wrap_pthread_mutex_lock'
/home/adam/workspace/toolchain/1110/bfin-uclinux/bin/../lib/gcc/bfin-uclinux/4.1.1/../../../../bfin-uclinux/lib/libpthread.a(
specific.o): In function `_pthread_key_delete':

And this can be fixed like:

bfin-uclinux-gcc -Wl,-elf2flt -o cyclictest
-Wl,@/home/adam/workspace/xenomai/xenomai_src/xenomai-2.2.5/src/skins/posix/posix.wrappers
cyclictest-cyclictest.o -lpthread -lrt
../../skins/posix/.libs/libpthread_rt.a

But using "FDPIC" format is suggested.

Thanks,

-Yi

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diff -Nur xenomai-2.2.5.orig/configure xenomai-2.2.5/configure
--- xenomai-2.2.5.orig/configure	2006-11-05 23:31:46.000000000 +0800
+++ xenomai-2.2.5/configure	2006-11-14 11:15:47.000000000 +0800
@@ -21163,9 +21163,6 @@
         ;;
  blackfin)
 	XENO_USER_CFLAGS="$XENO_USER_CFLAGS -Wall -pipe"
-	# uClinux wants flat format executables; assume that our
-	# source format is ELF.
-	XENO_USER_LDFLAGS="-Wl,-elf2flt"
         ;;
  arm)
 	XENO_USER_CFLAGS="$XENO_USER_CFLAGS -Wall -pipe"
diff -Nur xenomai-2.2.5.orig/configure.in xenomai-2.2.5/configure.in
--- xenomai-2.2.5.orig/configure.in	2006-09-24 22:50:10.000000000 +0800
+++ xenomai-2.2.5/configure.in	2006-11-14 11:15:20.000000000 +0800
@@ -536,9 +536,6 @@
         ;;
  blackfin)
 	XENO_USER_CFLAGS="$XENO_USER_CFLAGS -Wall -pipe"
-	# uClinux wants flat format executables; assume that our
-	# source format is ELF.
-	XENO_USER_LDFLAGS="-Wl,-elf2flt"
         ;;
  arm)
 	XENO_USER_CFLAGS="$XENO_USER_CFLAGS -Wall -pipe"
diff -Nur xenomai-2.2.5.orig/README.INSTALL xenomai-2.2.5/README.INSTALL
--- xenomai-2.2.5.orig/README.INSTALL	2006-07-18 21:19:17.000000000 +0800
+++ xenomai-2.2.5/README.INSTALL	2006-11-14 11:13:06.000000000 +0800
@@ -270,12 +270,9 @@
 $ make ARCH=bfinnommu CROSS_COMPILE=bfin-uclinux- xconfig/gconfig/menuconfig # select the kernel and Xenomai options
 $ make ARCH=bfinnommu CROSS_COMPILE=bfin-uclinux- bzImage modules # then install as needed
 $ mkdir $build_root && cd $build_root
-$ $xenomai_root/configure --build=i686-pc-linux-gnu --host=bfinnommu-unknown-linux-gnu CC=bfin-uclinux-gcc CXX=bfin-uclinux-gcc AR=bfin-uclinux-ar LD=bfin-uclinux-ld --disable-shared
+$ $xenomai_root/configure --host=bfin CC=bfin-uclinux-gcc CFLAGS=-mfdpic 
 $ make install
 
-CAUTION: note the --disabled-shared flag configuring out the shared
-library support, which is unavailable for this architecture.
-
 You may also want to have a look at this hands-on description about
 configuring and building a Xenomai system for the Blackfin
 architecture: http://docs.blackfin.uclinux.org/doku.php?id=adeos

Re: [Xenomai-core] [PATCH]Build xenomai on Blackfin in FDPIC format

[Gilles Chanteperdrix]

Li Yi (Adam) wrote:
> Hi Philippe,
> 
> Since bfin-gcc release 2006-R1, bfin-gcc begins to support "FDPIC"
> format besides "BFLT".
> "FDPIC" supports shared library. Bellow patch makes it possible to build
> xenomai-2.2.5 in FDPIC
> format. In docs.blackfin.uclinux.org/doku.php?id=adeos
> <http://docs.blackfin.uclinux.org/doku.php?id=adeos> there is step by
> step guide.
> 
> Although it is still possible to build xenomai as BFLT in this way:
> 
> configure --host=bfin CC=bfin-uclinux-gcc LDFLAGS=-Wl,-elf2flt
> --disable-shared
> 
> There will be error:
> 
>  bfin-uclinux-gcc -Wl,-elf2flt -o cyclictest
> -Wl,@/home/adam/workspace/xenomai/xenomai_src/xenomai-
> 2.2.5/src/skins/posix/posix.wrappers cyclictest-cyclictest.o 
> ../../skins/posix/.libs/libpthread_rt.a -lpthread -lrt
> /home/adam/workspace/toolchain/1110/bfin-uclinux/bin/../lib/gcc/bfin-uclinux/4.1.1/../../../../bfin-uclinux/lib/libpthread.a(
> specific.o): In function `_pthread_key_delete':
> (.text+0x24e): undefined reference to `___wrap_pthread_mutex_lock'
> /home/adam/workspace/toolchain/1110/bfin-uclinux/bin/../lib/gcc/bfin-uclinux/4.1.1/../../../../bfin-uclinux/lib/libpthread.a(
> specific.o): In function `_pthread_key_delete':
> 
> And this can be fixed like:
> 
> bfin-uclinux-gcc -Wl,-elf2flt -o cyclictest
> -Wl,@/home/adam/workspace/xenomai/xenomai_src/xenomai-2.2.5/src/skins/posix/posix.wrappers
> cyclictest-cyclictest.o -lpthread -lrt
> ../../skins/posix/.libs/libpthread_rt.a

This fix is incorrect. The correct way of linking is to do it in two steps:

bfin-uclinux-ld -r -o cyclictest.part
@/home/adam/workspace/xenomai/xenomai_src/xenomai-2.2.5/src/skins/posix/posix.wrappers
cyclictest-cyclictest.o ../../skins/posix/.libs/libpthread_rt.a

bfin-uclinux-gcc -Wl,-elf2flt -o cyclictest cyclictest.part -lpthread -lrt

-- 
                                                 Gilles Chanteperdrix

Re: [Xenomai-core] [PATCH]Build xenomai on Blackfin in FDPIC format

[Philippe Gerum]

On Tue, 2006-11-14 at 11:32 +0800, Li Yi (Adam) wrote:
> Hi Philippe,
> 
> Since bfin-gcc release 2006-R1, bfin-gcc begins to support "FDPIC"
> format besides "BFLT".
> "FDPIC" supports shared library. Bellow patch makes it possible to
> build xenomai-2.2.5 in FDPIC
> format. In docs.blackfin.uclinux.org/doku.php?id=adeos there is step
> by step guide.
> 
> Although it is still possible to build xenomai as BFLT in this way: 
> 
> configure --host=bfin CC=bfin-uclinux-gcc LDFLAGS=-Wl,-elf2flt
> --disable-shared
> 
> There will be error:
> 
>  bfin-uclinux-gcc -Wl,-elf2flt -o cyclictest
> -Wl,@/home/adam/workspace/xenomai/xenomai_src/xenomai-
> 2.2.5/src/skins/posix/posix.wrappers
> cyclictest-cyclictest.o  ../../skins/posix/.libs/libpthread_rt.a
> -lpthread -lrt
> /home/adam/workspace/toolchain/1110/bfin-uclinux/bin/../lib/gcc/bfin-uclinux/4.1.1/../../../../bfin-uclinux/lib/libpthread.a( specific.o): In function `_pthread_key_delete':
> (.text+0x24e): undefined reference to `___wrap_pthread_mutex_lock'
> /home/adam/workspace/toolchain/1110/bfin-uclinux/bin/../lib/gcc/bfin-uclinux/4.1.1/../../../../bfin-uclinux/lib/libpthread.a( specific.o): In function `_pthread_key_delete':
> 
> And this can be fixed like:
> 
> bfin-uclinux-gcc -Wl,-elf2flt -o cyclictest
> -Wl,@/home/adam/workspace/xenomai/xenomai_src/xenomai-2.2.5/src/skins/posix/posix.wrappers cyclictest-cyclictest.o -lpthread -lrt ../../skins/posix/.libs/libpthread_rt.a
> 

As Gilles pointed out, we probably need a two steps link process here;
fiddling with the object ordering won't solve the library
inter-dependencies properly.

> But using "FDPIC" format is suggested.
> 

We'll move to FDPIC. No need to stick with a limitation on shared
objects, which additionally requires a two step building process for
working around chicken-and-eggs linking issues.

> Thanks,
> 
> -Yi
> _______________________________________________
> Xenomai-core mailing list
> Xenomai-core@domain.hid
> https://mail.gna.org/listinfo/xenomai-core
-- 
Philippe.