[mpich-discuss] MPICH build errors, cannot find -levent(_pthreads)

Sajid Ali sajidsyed2021 at u.northwestern.edu
Tue Mar 17 15:07:23 CDT 2020

Hi Hui,

libevent(-2.0.so.5) is at available at /lib64. pmix depends on libevent as
per the spack recipe
Checking for libpmix linkage I do see that it is linked to libevent :

[sas4990 at quser10 lib64]$ pwd
[sas4990 at quser10 lib64]$ ldd libpmix.so.2.2.25
        linux-vdso.so.1 =>  (0x00007fffbfbe7000)
        libm.so.6 => /lib64/libm.so.6 (0x00002b413ffb3000)
        libutil.so.1 => /lib64/libutil.so.1 (0x00002b41402b5000)
        libevent-2.0.so.5 => /lib64/libevent-2.0.so.5 (0x00002b41404b8000)
        libevent_pthreads-2.0.so.5 =>
/lib64/libevent_pthreads-2.0.so.5 (0x00002b4140700000)
        libz.so.1 =>
        libdl.so.2 => /lib64/libdl.so.2 (0x00002b4140b1a000)
        libpthread.so.0 => /lib64/libpthread.so.0 (0x00002b4140d1e000)
        libc.so.6 => /lib64/libc.so.6 (0x00002b4140f3a000)
        /lib64/ld-linux-x86-64.so.2 (0x00002b413fa75000)
[sas4990 at quser10 lib64]$

I’m confused as to why libtool is unable to read use the dependency listing
of pmix to find libevent. readelf tells me that libpmix doesn’t have rpaths
set for it’s dependencies, could this be the cause of the linker being
unable to find libevent ?

Thank You
Sajid Ali | PhD Candidate
Applied Physics
Northwestern University
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