Bug 6224 - Cannot enable threads on arm7tdmi (MMU-less) arch
Summary: Cannot enable threads on arm7tdmi (MMU-less) arch
Status: NEW
Alias: None
Product: uClibc
Classification: Unclassified
Component: Threads (show other bugs)
Version: 0.9.33.2
Hardware: PC Linux
: P5 minor
Target Milestone: ---
Assignee: unassigned
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2013-05-04 04:57 UTC by Adam Nielsen
Modified: 2013-05-04 04:58 UTC (History)
1 user (show)

See Also:
Host:
Target:
Build:

Attachments
uClibc config, generated through buildroot (5.72 KB, application/octet-stream)
2013-05-04 04:57 UTC, Adam Nielsen 		Details
buildroot config to generate error (26.24 KB, application/octet-stream)
2013-05-04 04:58 UTC, Adam Nielsen 		Details
Add an attachment (proposed patch, testcase, etc.)

Note You need to log in before you can comment on or make changes to this bug.
Description Adam Nielsen 2013-05-04 04:57:46 UTC 
Created attachment 4862 [details]
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.
Comment 1 Adam Nielsen 2013-05-04 04:58:59 UTC 
Created attachment 4868 [details]
buildroot config to generate error

Add buildroot config