errors in btrfs.cc and ext4.cc prevent snapper from building about snapper

[aschnell]

New support for "rollback" needs libbtrfs. Please use ./configure --disable-rollback or install libbtrfs. A configure check for this dependency is still missing.

The ext4 issues are warnings. Since ext4 support will most likely not work anymore you can use --disable-ext4.

[holgersson32644]

Thanks, I can confirm it works with './configure --disable-rollback' and is not depending on ext4-support.

Anyway, here at gentoo is sys-fs/btrfs-progs in version 3.14_pre20140414 installed and provides following libraries:

/usr/lib64/libbtrfs.a
/usr/lib64/libbtrfs.so
/usr/lib64/libbtrfs.so.0
/usr/lib64/libbtrfs.so.0.1

So may I ask which version libbtrfs do you use?
[small corrections.]

[aschnell]

The libbtrfs version should be new enough. The file config.log tells why autoconf does not detect libbtrfs.

Maybe you hit the following problem: http://www.spinics.net/lists/linux-btrfs/msg33434.html

[holgersson32644]

Yes it looks that way:
"configure:15937: x86_64-pc-linux-gnu-gcc -o conftest -march=core2 -O2 -pipe -fomit-frame-pointer -std=c99 -Wall -Wextra -Wformat=2 -Wmissing-prototypes -Wno-unused-parameter -DCONFDIR='"/etc/conf.d"' -Wl,-O1 -Wl,--as-needed conftest.c -lbtrfs >&5
/usr/lib/gcc/x86_64-pc-linux-gnu/4.8.2/../../../../lib64/libbtrfs.so: undefined reference to `arg_strtou64'"

So - as far as I understand this is an upstream bug. Therefore I close this bug report. Thanks for help anyway!