#!/bin/sh

# Shell script with one argument (path of an OpenMP executable) that exits
# with status 0 if the OpenMP test program should be run and that exits with
# status 1 if the OpenMP test program should not be run.

test -e "$1" || exit $?

./supported_libpthread || exit $?

# Do not accept any statically linked executable.
if /usr/bin/file "$1" | grep -q 'statically linked'; then
  exit 1
fi

if [ "$(uname)" = Linux ]; then

  # Let the dynamic linker/loader print the path of libgomp. See also man ld.so
  libgomp_path="$(LD_TRACE_LOADED_OBJECTS=1 "$1" \
    | while read soname arrow path offset; \
   do if [ "${soname#libgomp.so}" != "${soname}" ]; then echo $path; fi; done)"

  # Inspect the output of nm. If nm does not find any symbol information,
  # echo 1. If the symbol gomp_barrier_init is found, echo 0. Otherwise echo
  # nothing. The second case occurs if gcc has been compiled with 
  # --disable-linux-futex, and the last case occurs if gcc has been compiled
  # with --enable-linux-futex.
  rc="$(nm "${libgomp_path}" 2>&1 \
        |
        while read line
        do
          if [ "${line%: no symbols}" != "${line}" ]; then
            echo 1
            break
          elif [ "${line% gomp_barrier_init}" != "${line}" ]; then
            echo 0
            break
          fi
        done)"
  exit ${rc:-1}

fi