On Wed, Nov 23, 2016 at 1:43 PM, Mike Gilbert <floppymaster@xxxxxxxxx> wrote: > On Wed, Nov 23, 2016 at 4:45 AM, David Sterba <dsterba@xxxxxxx> wrote: >> On Tue, Nov 22, 2016 at 01:49:15PM -0500, Mike Gilbert wrote: >>> Hi, >>> >>> I received a bug report about a build failure in a package (snapper) >>> that utilizes libbtrfs. >>> >>> https://bugs.gentoo.org/show_bug.cgi?id=600078 >>> >>> To summarize the issue, the package has a configure test that executes >>> the following: >>> >>> configure:16618: x86_64-pc-linux-gnu-gcc -o conftest -O2 -pipe >>> -march=amdfam10 -frecord-gcc-switches -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/5.4.0/../../../../lib64/libbtrfs.so: >>> undefined reference to `lookup_path_rootid' >>> collect2: error: ld returned 1 exit status >>> configure:16618: $? = 1 >>> >>> It seems that the "lookup_path_rootid" symbol is not included in the library. >>> >>> Could someone look into this? >> >> Thanks for the report, bug reproduced here. My referential snapper build >> does not fail so I did not know about that. I've now extended the >> library test to cover the missing symbol. As the build does not fail >> it's needed to actually run the built binary. > > That's very strange; I definitely get a build-time failure here. Maybe > there's some difference in your toolchain. > > On current master: > > floppym@naomi btrfs-progs % make V=1 library-test > [LD] library-test > gcc -g -O1 -Wall -D_FORTIFY_SOURCE=2 -include config.h > -DBTRFS_FLAT_INCLUDES -D_XOPEN_SOURCE=700 -fno-strict-aliasing -fPIC > -I/home/floppym/src/btrfs-progs > -I/home/floppym/src/btrfs-progs/kernel-lib -o library-test > library-test.o -rdynamic -lbtrfs > /usr/lib/gcc/x86_64-pc-linux-gnu/5.4.0/../../../../lib64/libbtrfs.so: > undefined reference to `lookup_path_rootid' > collect2: error: ld returned 1 exit status > make: *** [Makefile:433: library-test] Error 1 Oh! Based on that command line, library-test is getting linked against /usr/lib64/libbtrfs.so instead of the freshly built copy in $PWD. You probably need to add -L. or -L$(TOPDIR) to that command in the Makefile. -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
