On 14.11.2011 16:47, Arnd Hannemann wrote:
> This patch fixes the following compile error when compiled with
> gcc version 4.6.1 (Ubuntu/Linaro 4.6.1-9ubuntu3):
> 
> gcc -lpthread -g -O0 -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':
> /home/arnd/Projekte/kernel/btrfs-progs/scrub.c:1342: undefined reference to 
> `pthread_create'
> /home/arnd/Projekte/kernel/btrfs-progs/scrub.c:1360: undefined reference to 
> `pthread_create'
> /home/arnd/Projekte/kernel/btrfs-progs/scrub.c:1374: undefined reference to 
> `pthread_join'
> /home/arnd/Projekte/kernel/btrfs-progs/scrub.c:1430: undefined reference to 
> `pthread_cancel'
> /home/arnd/Projekte/kernel/btrfs-progs/scrub.c:1432: undefined reference to 
> `pthread_join'
> collect2: ld returned 1 exit status
> make: *** [btrfs] Error 1
> 
> The gcc man page says: "[...] the placement of the -l option is significant." 
> so lets include -lpthread together with the usual $(LIBS)
>
> Signed-off-by: Arnd Hannemann <[email protected]>
Signed-off-by: Jan Schmidt <[email protected]>

Sergei also sent this patch a week ago. I agree with you. David, do you
want to investigate the -pthread option?

-Jan
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