[petsc-dev] Investigation about 'unused direct shared library dependencies'

[Antonio Trande]

Hi all.

I'm compiling PETSc 3.7.3 on Fedora; the libraries are built in 4
different stages, each stage starting from a *clean PETSc source* directory:

petsc src
       |
       v
     petsc src1 |--> serial libraries (link1)
     petsc src2 |--> serial (64bit INTEGER) libraries (link2)
     petsc src3 |--> OpenMPI libraries (link3)
     petsc src4 |--> MPICH libraries (link4)

link1:
http://copr-dist-git.fedorainfracloud.org/cgit/sagitter/petsc/petsc.git/tree/petsc.spec?id=ea7abab121859c66de05f70863950b4a6c5f7035#n402

link2:
http://copr-dist-git.fedorainfracloud.org/cgit/sagitter/petsc/petsc.git/tree/petsc.spec?id=ea7abab121859c66de05f70863950b4a6c5f7035#n559

link3:
http://copr-dist-git.fedorainfracloud.org/cgit/sagitter/petsc/petsc.git/tree/petsc.spec?id=ea7abab121859c66de05f70863950b4a6c5f7035#n682

link4:
http://copr-dist-git.fedorainfracloud.org/cgit/sagitter/petsc/petsc.git/tree/petsc.spec?id=ea7abab121859c66de05f70863950b4a6c5f7035#n842

The resulting libraries look contain 'unused (strange) direct shared
library dependencies'. Like for serial libpetsc.so:

$ ldd -u /usr/lib64/libpetsc.so.3.7.3
Unused direct dependencies:
	/lib64/libmetis.so.0
	/lib64/libhwloc.so.5
	/lib64/libhdf5.so.10
	/lib64/libquadmath.so.0
	/lib64/libstdc++.so.6
	/lib64/libgomp.so.1

libmetis.so is (correctly?) activated with *--with-metis=1* option but
results unused.
libhwloc.so.5, libhdf5.so.10 and libstdc++.so shouldn't be linked.

Here you can find a full build log on Fedora 24 64bit:
https://copr-be.cloud.fedoraproject.org/results/sagitter/petsc/fedora-24-x86_64/00461492-petsc/build.log.gz

RPMs built are:
https://copr-be.cloud.fedoraproject.org/results/sagitter/petsc/fedora-24-x86_64/00461492-petsc/

Do you have idea why this happens?

Regards.
---
Antonio Trande
mailto: sagitter 'at' fedoraproject 'dot' org
http://fedoraos.wordpress.com/
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