Updates to hdf5 automake macro

m4/ax_lib_hdf5.m4

 # ===========================================================================
-#        http://www.gnu.org/software/autoconf-archive/ax_lib_hdf5.html
+#       https://www.gnu.org/software/autoconf-archive/ax_lib_hdf5.html
 # ===========================================================================
 #
 # SYNOPSIS
@@ -38,11 +38,12 @@
 #     AC_SUBST(HDF5_FC)
 #     AC_SUBST(HDF5_FFLAGS)
 #     AC_SUBST(HDF5_FLIBS)
+#     AC_SUBST(HDF5_TYPE)
 #     AC_DEFINE(HAVE_HDF5)
 #
 #   and sets with_hdf5="yes".  Additionally, the macro sets
 #   with_hdf5_fortran="yes" if a matching Fortran wrapper script is found.
-#   Note that Autconf's Fortran support is not used to perform this check.
+#   Note that Autoconf's Fortran support is not used to perform this check.
 #   H5CC and H5FC will contain the appropriate serial or parallel HDF5
 #   wrapper script locations.
 #
@@ -79,6 +80,9 @@
 #             AC_MSG_ERROR([Unable to find HDF5, we need parallel HDF5.])
 #     fi
 #
+#   The HDF5_TYPE environment variable returns "parallel" or "serial",
+#   depending on which type of library is found.
+#
 # LICENSE
 #
 #   Copyright (c) 2009 Timothy Brown <tbrown@freeshell.org>
@@ -89,7 +93,7 @@
 #   and this notice are preserved. This file is offered as-is, without any
 #   warranty.
 
-#serial 11
+#serial 19
 
 AC_DEFUN([AX_LIB_HDF5], [
 
@@ -142,6 +146,7 @@ HDF5_LIBS=""
 HDF5_FC=""
 HDF5_FFLAGS=""
 HDF5_FLIBS=""
+HDF5_TYPE=""
 
 dnl Try and find hdf5 compiler tools and options.
 if test "$with_hdf5" = "yes"; then
@@ -158,6 +163,13 @@ if test "$with_hdf5" = "yes"; then
         AC_MSG_CHECKING([Using provided HDF5 C wrapper])
         AC_MSG_RESULT([$H5CC])
     fi
+    AC_MSG_CHECKING([for HDF5 type])
+    AS_CASE([$H5CC],
+        [*h5pcc], [HDF5_TYPE=parallel],
+        [*h5cc], [HDF5_TYPE=serial],
+        [HDF5_TYPE=neither])
+    AC_MSG_RESULT([$HDF5_TYPE])
+    AC_MSG_CHECKING([for HDF5 libraries])
     if test ! -f "$H5CC" || test ! -x "$H5CC"; then
 
 dnl Check if we already have HDF5 for C.
@@ -211,9 +223,9 @@ HDF5 support is being disabled.
         HDF5_SHOW=$(eval $H5CC -show)
 
         dnl Get the actual compiler used
-        HDF5_CC=$(eval $H5CC -show | $AWK '{print $[]1}')
+        HDF5_CC=$(eval $H5CC -show | head -n 1 | $AWK '{print $[]1}')
         if test "$HDF5_CC" = "ccache"; then
-            HDF5_CC=$(eval $H5CC -show | $AWK '{print $[]2}')
+            HDF5_CC=$(eval $H5CC -show | head -n 1 | $AWK '{print $[]2}')
         fi
 
         dnl h5cc provides both AM_ and non-AM_ options
@@ -249,21 +261,22 @@ HDF5 support is being disabled.
         for arg in $HDF5_SHOW $HDF5_tmp_flags ; do
           case "$arg" in
             -I*) echo $HDF5_CPPFLAGS | $GREP -e "$arg" 2>&1 >/dev/null \
-                  || HDF5_CPPFLAGS="$arg $HDF5_CPPFLAGS"
+                  || HDF5_CPPFLAGS="$HDF5_CPPFLAGS $arg"
               ;;
             -L*) echo $HDF5_LDFLAGS | $GREP -e "$arg" 2>&1 >/dev/null \
-                  || HDF5_LDFLAGS="$arg $HDF5_LDFLAGS"
+                  || HDF5_LDFLAGS="$HDF5_LDFLAGS $arg"
               ;;
             -l*) echo $HDF5_LIBS | $GREP -e "$arg" 2>&1 >/dev/null \
-                  || HDF5_LIBS="$arg $HDF5_LIBS"
+                  || HDF5_LIBS="$HDF5_LIBS $arg"
               ;;
           esac
         done
 
-        HDF5_LIBS="$HDF5_LIBS -lhdf5"
+        HDF5_LIBS="-lhdf5 $HDF5_LIBS"
         AC_MSG_RESULT([yes (version $[HDF5_VERSION])])
 
         dnl See if we can compile
+        AC_LANG_PUSH([C])
         ax_lib_hdf5_save_CC=$CC
         ax_lib_hdf5_save_CPPFLAGS=$CPPFLAGS
         ax_lib_hdf5_save_LIBS=$LIBS
@@ -279,12 +292,13 @@ HDF5 support is being disabled.
           AC_MSG_WARN([Unable to compile HDF5 test program])
         fi
         dnl Look for HDF5's high level library
-        AC_HAVE_LIBRARY([hdf5_hl], [HDF5_LIBS="$HDF5_LIBS -lhdf5_hl"], [], [])
+        AC_HAVE_LIBRARY([hdf5_hl], [HDF5_LIBS="-lhdf5_hl $HDF5_LIBS"], [], [])
 
         CC=$ax_lib_hdf5_save_CC
         CPPFLAGS=$ax_lib_hdf5_save_CPPFLAGS
         LIBS=$ax_lib_hdf5_save_LIBS
         LDFLAGS=$ax_lib_hdf5_save_LDFLAGS
+        AC_LANG_POP([C])
 
         AC_MSG_CHECKING([for matching HDF5 Fortran wrapper])
         dnl Presume HDF5 Fortran wrapper is just a name variant from H5CC
@@ -299,14 +313,14 @@ HDF5 support is being disabled.
             do
               case "$arg" in #(
                 -I*) echo $HDF5_FFLAGS | $GREP -e "$arg" >/dev/null \
-                      || HDF5_FFLAGS="$arg $HDF5_FFLAGS"
+                      || HDF5_FFLAGS="$HDF5_FFLAGS $arg"
                   ;;#(
                 -L*) echo $HDF5_FFLAGS | $GREP -e "$arg" >/dev/null \
-                      || HDF5_FFLAGS="$arg $HDF5_FFLAGS"
+                      || HDF5_FFLAGS="$HDF5_FFLAGS $arg"
                      dnl HDF5 installs .mod files in with libraries,
                      dnl but some compilers need to find them with -I
                      echo $HDF5_FFLAGS | $GREP -e "-I${arg#-L}" >/dev/null \
-                      || HDF5_FFLAGS="-I${arg#-L} $HDF5_FFLAGS"
+                      || HDF5_FFLAGS="$HDF5_FFLAGS -I${arg#-L}"
                   ;;
               esac
             done
@@ -337,7 +351,9 @@ HDF5 support is being disabled.
 	AC_SUBST([HDF5_FC])
 	AC_SUBST([HDF5_FFLAGS])
 	AC_SUBST([HDF5_FLIBS])
+	AC_SUBST([HDF5_TYPE])
 	AC_DEFINE([HAVE_HDF5], [1], [Defined if you have HDF5 support])
     fi
 fi
 ])
+