Experimental Physics and
Industrial Control System

"J. Lewis Muir via Core-talk" <core-talk at aps.anl.gov> · Wed, 19 Aug 2020 17:15:34 -0000

I think it would be better to test for the presence of the backtrace()
function at build time.  This is what Autoconf and various other build
configuration systems do.  It's much better to test for a feature than
an OS version or, in this case, a C standard library implementation.

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https://bugs.launchpad.net/bugs/1892190

Title:
  Building epics-base fails on musl based systems

Status in EPICS Base:
  New

Bug description:
  I am trying to build EPICS base 7.0.4 inside a docker container based
  on alpine linux, which uses musl in place of glibc.

  The build options used are CXXFLAGS="-DIPPORT_USERRESERVED=5000
  -fPIC".

  The build fails because the "backtrace" function does not exist in
  musl:

  /usr/bin/g++ -o iocLogServer  -L/EPICS/base/lib/linux-x86_64 -Wl,-rpath,/EPICS/base/lib/linux-x86_64           -rdynamic -m64         iocLogServer.o    -lCom
  /usr/lib/gcc/x86_64-alpine-linux-musl/9.2.0/../../../../x86_64-alpine-linux-musl/bin/ld: /EPICS/base/lib/linux-x86_64/libCom.so: undefined reference to `backtrace'
  collect2: error: ld returned 1 exit status

  Looking into epics-
  base/modules/libcom/src/osi/os/posix/osdExecinfoBackTrace.cpp, which
  is the only file using that function, I was in the end able to
  successfully build EPICS by adding "-D__UCLIBC_MAJOR__=0" to the build
  options.

  However, it would be better to detect the presence of backtrace() by
  testing the existence of __GLIBC__ or __GNU_LIBRARY__, or,
  alternatively, to provide the user with the possibility of disabling
  backtrace support.

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System