[Bug 6224] New: Cannot enable threads on arm7tdmi (MMU-less) arch

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=6224

           Summary: Cannot enable threads on arm7tdmi (MMU-less) arch
           Product: uClibc
           Version: 0.9.33.2
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: minor
          Priority: P5
         Component: Threads
        AssignedTo: unassigned at uclibc.org
        ReportedBy: a.nielsen at shikadi.net
                CC: uclibc-cvs at uclibc.org
   Estimated Hours: 0.0


Created attachment 4862
  --> https://bugs.busybox.net/attachment.cgi?id=4862
uClibc config, generated through buildroot

It does not seem to be possible to compile uClibc on the arm7tdmi architecture
with threads enabled:

With old/new linuxthreads:

  CC libpthread/linuxthreads/sysdeps/arm/pspinlock.os
  CC libpthread/linuxthreads/sysdeps/unix/sysv/linux/fork.os
In file included from
./libpthread/linuxthreads/sysdeps/unix/sysv/linux/fork.h:21:0,
                 from
libpthread/linuxthreads/sysdeps/unix/sysv/linux/fork.c:21:
./include/bits/libc-lock.h:36:27: fatal error: lowlevellock.h: No such file or
directory
 # include <lowlevellock.h>
                           ^
compilation terminated.
make[1]: *** [libpthread/linuxthreads/sysdeps/unix/sysv/linux/fork.os] Error 1

With native (NPTL) threads:

  AS libpthread/nptl/sysdeps/unix/sysv/linux/arm/clone.os
  AS libpthread/nptl/sysdeps/unix/sysv/linux/arm/vfork.os
  CC libpthread/nptl/sysdeps/unix/sysv/linux/arm/fork.os
In file included from libpthread/nptl/sysdeps/unix/sysv/linux/arm/fork.c:31:0:
libpthread/nptl/sysdeps/unix/sysv/linux/arm/../fork.c:61:17: error: 'fork'
undeclared here (not in a function)
 extern __typeof(fork) __libc_fork;
                 ^
libpthread/nptl/sysdeps/unix/sysv/linux/arm/../fork.c:63:1: error:
'__libc_fork' redeclared as different kind of symbol
 __libc_fork (void)
 ^
libpthread/nptl/sysdeps/unix/sysv/linux/arm/../fork.c:61:23: note: previous
declaration of '__libc_fork' was here
 extern __typeof(fork) __libc_fork;
                       ^
In file included from <command-line>:0:0:
libpthread/nptl/sysdeps/unix/sysv/linux/arm/../fork.c:228:24: error: 'fork'
redeclared as different kind of symbol
 weak_alias(__libc_fork,fork)
...

If it is not possible to use threads on an MMU-less system, I think the option
should be disabled.

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