Add sanity check for libraries with missing symbols #1304
Description
I've come across two packages now that have built without any trouble, but have later caused problems for users trying to link to them. The first was py-meep, which complained about missing symbols when imported (see #1156 (comment)). The second was Armadillo (see #1299 (comment)).
These problems can be hard to debug, but fairly easy to check for. In the case of Armadillo, it looks like this:
$ ldd -r libarmadillo.so
linux-vdso.so.1 => (0x00007ffdd8b61000)
libopenblas.so.0 => /blues/gpfs/home/software/spack/opt/spack/linux-centos6-x86_64/gcc-6.1.0/openblas-0.2.18-avx2mvh76o62v5a2dr5u6zz2ewer5p7w/lib/libopenblas.so.0 (0x00002b8a88ba1000)
libstdc++.so.6 => /blues/gpfs/home/software/spack/opt/spack/linux-x86_64/gcc-5.3.0/gcc-6.1.0-q2zosj3igepi3pjnqt74bwazmptr5gpj/lib64/libstdc++.so.6 (0x00002b8a89b7f000)
libm.so.6 => /lib64/libm.so.6 (0x00002b8a89f16000)
libgcc_s.so.1 => /blues/gpfs/home/software/spack/opt/spack/linux-x86_64/gcc-5.3.0/gcc-6.1.0-q2zosj3igepi3pjnqt74bwazmptr5gpj/lib64/libgcc_s.so.1 (0x00002b8a8a19a000)
libc.so.6 => /lib64/libc.so.6 (0x00002b8a8a3b1000)
/lib64/ld-linux-x86-64.so.2 (0x00002b8a886f1000)
libpthread.so.0 => /lib64/libpthread.so.0 (0x00002b8a8a745000)
libgfortran.so.3 => /blues/gpfs/home/software/spack/opt/spack/linux-x86_64/gcc-5.3.0/gcc-6.1.0-q2zosj3igepi3pjnqt74bwazmptr5gpj/lib64/libgfortran.so.3 (0x00002b8a8a963000)
libquadmath.so.0 => /blues/gpfs/home/software/spack/opt/spack/linux-x86_64/gcc-5.3.0/gcc-6.1.0-q2zosj3igepi3pjnqt74bwazmptr5gpj/lib64/../lib64/libquadmath.so.0 (0x00002b8a8ac8a000)
undefined symbol: zvout_ (./libarmadillo.so)
undefined symbol: dvout_ (./libarmadillo.so)
undefined symbol: cvout_ (./libarmadillo.so)
undefined symbol: dmout_ (./libarmadillo.so)
undefined symbol: smout_ (./libarmadillo.so)
undefined symbol: cmout_ (./libarmadillo.so)
undefined symbol: svout_ (./libarmadillo.so)
undefined symbol: zmout_ (./libarmadillo.so)
undefined symbol: ivout_ (./libarmadillo.so)I propose the following sanity check. Run this command on all installed dynamic libraries:
ldd -r <libname.so> | grep "undefined symbol"@citibeth You've been the biggest opponent of sanity checks. Can you foresee any problems with this?