Problems with linking on FreeBSD-10
stephen at missouri.edu
Fri Jan 31 17:31:17 UTC 2014
On 01/31/14 07:25, Konstantin Belousov wrote:
> On Fri, Jan 31, 2014 at 12:19:46AM +0000, Montgomery-Smith, Stephen wrote:
>> I maintain the port math/sage. The port builds its own version of the
>> libreadline library. The port also uses lang/gcc instead of clang,
>> because the port needs Fortran.
>> The port is wanting to create a shared library called libR.so, which it
>> wants to link with the libreadline library it created itself. So it
>> issues this kind of command:
>> gcc46 -Wl,-rpath=path-of-newly-made-library -o libR.so -lreadline
>> I have left out most of the command for brevity.
> Not for brevity, but to make the diagnostic impossible.
Here are more details. I have the -L there as well.
It creates libR.so using a command
cc -std=gnu99 -shared -fopenmp
-Wl,-rpath=/usr/local/lib/gcc46 -L/usr/local/lib/gcc46 -o libR.so
CommandLineArgs.o Rdynload.o Renviron.o RNG.o agrep.o apply.o
arithmetic.o array.o attrib.o bind.o builtin.o character.o coerce.o
colors.o complex.o connections.o context.o cum.o dcf.o datetime.o
debug.o deparse.o devices.o dotcode.o dounzip.o dstruct.o duplicate.o
edit.o engine.o envir.o errors.o eval.o format.o gevents.o gram.o
gram-ex.o graphics.o grep.o identical.o inlined.o inspect.o internet.o
iosupport.o lapack.o list.o localecharset.o logic.o main.o mapply.o
match.o memory.o names.o objects.o options.o paste.o platform.o plot.o
plot3d.o plotmath.o print.o printarray.o printvector.o printutils.o
qsort.o random.o raw.o registration.o relop.o rlocale.o saveload.o
scan.o seq.o serialize.o sort.o source.o split.o sprintf.o startup.o
subassign.o subscript.o subset.o summary.o sysutils.o unique.o util.o
version.o vfonts.o xxxpr.o `ls ../unix/*.o ../appl/*.o ../nmath/*.o`
../extra/zlib/libz.a ../extra/bzip2/libbz2.a ../extra/pcre/libpcre.a
-L/usr/home/stephen/sage/work/sage-6.0/local/lib -lf77blas -latlas
-lgfortran -lm -lquadmath -lintl -lreadline -llzma -lrt -lm -liconv
Now -Wl,-rpath is set, so it should find libreadline in
/usr/home/stephen/sage/work/sage-6.0/local/lib. But instead it finds
libreadline in /lib. So later when it does the following compilation to
gcc -std=gnu99 -export-dynamic -fopenmp
-Wl,-rpath=/usr/local/lib/gcc46 -L/usr/local/lib/gcc46 -o R.bin Rmain.o
...it comes up with an error saying that rl_sort_completion_matches
isn't found. And when I do an ldd or "readelf -d" on libR.so, I can see
that it is trying to link to the wrong libreadline, and
rl_sort_completion_matches is only defined in the other libreadline.
>> Unfortunately the libR.so pulls in /lib/libreadline - the version that
>> comes with the base FreeBSD. I thought that -rpath flag was supposed to
>> tell the linker where to find the library. But it doesn't.
> Show exact commands and exact error message. It is not possible to
> understand from you message is the failure at the static linking (ld(1))
> or dynamic (at the program startup) stage.
> Just in case this might be useful:
> - -rpath only affects runtime search path
> - ld(1) search for libraries is directed with the -L <path> option.
>> The failure is when using FreeBSD-10. With FreeBSD-8 it works great. I
>> also assume that gcc46 uses /usr/local/bin/ld instead of /usr/bin/ld,
>> since devel/binutils is a dependency of lang/gcc.
>> Can anyone help me? Is this a bug with FreeBSD? Or is there some extra
>> flag I can set with the linker to make it work? I have tried
>> -rpath-link and -z origin, but these were random guesses. and I don't
>> really know what I am doing.
>> Thanks, Stephen
>> freebsd-ports at freebsd.org mailing list
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