Btrfs devel - Jun 2012 - Error compiling btrfs-tools from git (undefined reference to `pthread_create')

On Ubuntu 11.10 "Oneiric" with gcc 4.6.1, compiling the btrfs tools
from git
fails for me with the following error:

[lenz@metis btrfs-progs]% make
bash version.sh
gcc -lpthread -g -Werror -Os -o btrfs btrfs.o btrfs_cmds.o scrub.o \
		ctree.o disk-io.o radix-tree.o extent-tree.o print-tree.o root-tree.o
dir-item.o file-item.o inode-item.o inode-map.o crc32c.o rbtree.o
extent-cache.o extent_io.o volumes.o utils.o btrfs-list.o btrfslabel.o  -luuid
scrub.o: In function `scrub_start'':
/space/tmp/btrfs-progs/scrub.c:1342: undefined reference to
`pthread_create''
/space/tmp/btrfs-progs/scrub.c:1360: undefined reference to
`pthread_create''
/space/tmp/btrfs-progs/scrub.c:1374: undefined reference to
`pthread_join''
/space/tmp/btrfs-progs/scrub.c:1430: undefined reference to
`pthread_cancel''
/space/tmp/btrfs-progs/scrub.c:1432: undefined reference to
`pthread_join''
collect2: ld returned 1 exit status
make: *** [btrfs] Error 1

The following change fixed this for me, not sure if it''s the
appropriate approach:

diff --git a/Makefile b/Makefile
index edee1a0..9e3a06f 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 CC = gcc
 AM_CFLAGS = -Wall -D_FILE_OFFSET_BITS=64 -D_FORTIFY_SOURCE=2
-CFLAGS = -g -Werror -Os
+CFLAGS = -g -Werror -Os -pthread
 objects = ctree.o disk-io.o radix-tree.o extent-tree.o print-tree.o \
          root-tree.o dir-item.o file-item.o inode-item.o \
          inode-map.o crc32c.o rbtree.o extent-cache.o extent_io.o \


-- 
  Lenz Grimmer <lenz@grimmer.com> - http://www.lenzg.net/

On Wed, Jun 27, 2012 at 6:11 AM, Lenz Grimmer <lenz@grimmer.com>
wrote:
> On Ubuntu 11.10 "Oneiric" with gcc 4.6.1, compiling the btrfs
tools from git
> fails for me with the following error:
Which git repo?
git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-progs.git
builds on ubuntu just fine (just checked on a fresh checkout), and
likewise the integration repo (but note that the integration repo''s
master branch is not useful to build; you need to check out one of the
actual integration branches as described on the wiki).
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Hi,

thank you for your reply.

On 06/27/2012 02:20 PM, cwillu wrote:
> On Wed, Jun 27, 2012 at 6:11 AM, Lenz Grimmer <lenz@grimmer.com>
wrote:
>> On Ubuntu 11.10 "Oneiric" with gcc 4.6.1, compiling the btrfs
tools from git
>> fails for me with the following error:
> 
> Which git repo?
> git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-progs.git
> builds on ubuntu just fine (just checked on a fresh checkout), and
> likewise the integration repo (but note that the integration
repo''s
> master branch is not useful to build; you need to check out one of the
> actual integration branches as described on the wiki).
That''s likely the issue - the following commands reproduce the compile
error
for me:

git clone http://git.darksatanic.net/repo/btrfs-progs-unstable.git btrfs-progs
cd btrfs-progs
make
[...]
gcc -lpthread -g -Werror -Os -o btrfs btrfs.o btrfs_cmds.o scrub.o \
		ctree.o disk-io.o radix-tree.o extent-tree.o print-tree.o root-tree.o
dir-item.o file-item.o inode-item.o inode-map.o crc32c.o rbtree.o
extent-cache.o extent_io.o volumes.o utils.o btrfs-list.o btrfslabel.o  -luuid
scrub.o: In function `scrub_start'':
/space/tmp/btrfs-progs/scrub.c:1342: undefined reference to
`pthread_create''
/space/tmp/btrfs-progs/scrub.c:1360: undefined reference to
`pthread_create''
/space/tmp/btrfs-progs/scrub.c:1374: undefined reference to
`pthread_join''
/space/tmp/btrfs-progs/scrub.c:1430: undefined reference to
`pthread_cancel''
/space/tmp/btrfs-progs/scrub.c:1432: undefined reference to
`pthread_join''
collect2: ld returned 1 exit status


However, using the integration-20120605 branch compiles fine. Thanks and sorry
for the noise!

Bye,
	LenZ
-- 
  Lenz Grimmer <lenz@grimmer.com> - http://www.lenzg.net/