collect.extra-libs.in

#!@SHELL@

# ICON
#
# ------------------------------------------
# Copyright (C) 2004-2024, DWD, MPI-M, DKRZ, KIT, ETH, MeteoSwiss
# Contact information: icon-model.org
# See AUTHORS.TXT for a list of authors
# See LICENSES/ for license information
# SPDX-License-Identifier: BSD-3-Clause
# ------------------------------------------

# Collect extra dependencies of the bundled libraries:
result=''
for subdir in @icon_bundled_config_subdirs@ @icon_bundled_cmake_subdirs@; do

  extra_libs=''

  case $subdir in
    externals/comin/build)
      # Extract dl libs from comin cmake variable
      extra_libs=`cmake -L $subdir | sed -n 's/^COMIN_DL_LIBS\(:[A-Z]\+\)=\(-l\)\?\(.\+\)/-l\3/p'`
      # We do not need extra_libs if its value is already in the LIBS:
      if test -n "$extra_libs"; then
        set dummy @LIBS@; shift
          case ' '"$@"' ' in
            *" $extra_libs "*)
              extra_libs= ;;
            *) ;;
          esac
      fi
      ;;
    externals/sct)
      # The bundled version of SCT, which we link statically, might require
      # additional linker flags:
      #   1) a flag enabling linking to librt;
      #   2) a flag enabling linking to C code that uses OpenMP.
      # First, we check whether we already have '-lrt' in the LIBS:
      set dummy @LIBS@; shift
      case ' '"$@"' ' in
        *' -lrt '*) ;;
        *)
          # If that is not the case, check whether the configure script of SCT
          # "decided" to include '-lrt' in the LIBS of SCT:
          sct_LIBS=`echo '@''LIBS@' | "$subdir/config.status" -q --file=- | sed 's/^ *//;s/ *$//'`
          case " $sct_LIBS " in
            *' -lrt '*)
              # If yes, we need to link with '-lrt':
              extra_libs='-lrt' ;;
            *) ;;
          esac
        ;;
      esac
      # Second, get the flags enabling the Fortran compiler to link C code that
      # uses OpenMP.
      sct_OPENMP_FC_C_FLAGS=`echo '@''OPENMP_FC_C_FLAGS@' | "$subdir/config.status" -q --file=- | sed 's/^ *//;s/ *$//'`
      # Check, whether we already have the flag in the linking command:
      set dummy @FC@ @FCFLAGS@ @ICON_FCFLAGS@ @LDFLAGS@ @LIBS@; shift
      # (note that the following does not properly account for multiple flags,
      # which is, however, very unlikely):
      case ' '"$@"' ' in
        *" $sct_OPENMP_FC_C_FLAGS "*)
          # If that is not the case, we need to link with the flag:
          extra_libs="$sct_OPENMP_FC_C_FLAGS${extra_libs:+ $sct_OPENMP_FC_C_FLAGS}" ;;
        *) ;;
      esac
      ;;
    externals/cdi)
      # The bundled version of CDI, which we link statically, might require
      # additional linker flags enabling linking to librt:
      extra_libs=`echo '@''LIBRT@' | "$subdir/config.status" -q --file=- | sed 's/^ *//;s/ *$//'`
      if test -z "$extra_libs"; then
        cdi_ENABLE_MPI_FALSE=`echo '@''ENABLE_MPI_FALSE@' | "$subdir/config.status" -q --file=- | sed 's/^ *//;s/ *$//'`
        if test "x$cdi_ENABLE_MPI_FALSE" = 'x#'; then
          # We are here because either CDI does not depend on librt or the
          # dependency is hidden by the libtool script of CDI (e.g. it found a
          # libtool .la file that has '-lrt' among the 'dependency_libs',
          # overlinked to librt and the configure script of CDI reported that no
          # additional linker flags are required to link to the library, hence
          # LIBRT was set to an empty string). The absence of the dependency on
          # librt is very unlikely and here we could simply set the variable
          # extra_libs to '-lrt'. However, we use this case as an example of how
          # such issues can be resolved in general. Note that libcdipio.la might
          # not exist yet, therefore we cannot parse it. Instead, we are going
          # to run the libtool script of CDI in a way that is close to how the
          # make program will call it:
          cdi_LINK=`echo "@""SHELL@ @abs_top_builddir@/$subdir/libtool --tag=CC --mode=link @""CC@ @""CFLAGS@ @""LDFLAGS@ -o libconftest.la @""LIBS@" | "$subdir/config.status" -q --file=-`
          # The libtool script generates some extra files and subdirectories,
          # which we would like to remove easily. Therefore, we create a
          # temporary subdirectory and switch to it:
          @MKDIR_P@ conftest.dir && cd conftest.dir
          # If calling the libtool script of CDI is successful and the created
          # dummy libtool file 'libconftest.la' has '-lrt' among the
          # 'dependency_libs', we set extra_libs to '-lrt':
          (eval $cdi_LINK) >/dev/null 2>&1
          if test $? -eq 0 && grep "dependency_libs=.*[ ']-lrt[ '].*" libconftest.la >/dev/null 2>&1; then
            extra_libs='-lrt'
          fi
          cd ..
          rm -rf conftest.dir
        fi
      fi
      # We do not need extra_libs if its value is already in the LIBS:
      if test -n "$extra_libs"; then
        set dummy @LIBS@; shift
          case ' '"$@"' ' in
            *" $extra_libs "*)
              extra_libs= ;;
            *) ;;
          esac
      fi
      ;;
    *) ;;
  esac

  if test -n "$extra_libs"; then
    if test -n "$result"; then
      result="$result $extra_libs"
    else
      result=$extra_libs
    fi
  fi

done

echo "$result"