Better handling of librt (fixup a6940e63).

configure.ac

@@ -261,13 +261,13 @@ AM_CONDITIONAL([USE_PPM_CORE],[test $enable_ppm = yes])
 AM_CONDITIONAL([HAVE_PARALLEL_NC4],[test $HAVE_PARALLEL_NC4 -gt 0])
 AC_SUBST([USE_MPI])
 AC_SUBST([ENABLE_MPI],[`test x"$enable_mpi" = xyes && echo true || echo false`])
-AC_SUBST([LIBRT])
+AC_SUBST([LIBRT], [''])
 AM_COND_IF([USE_MPI],
-  [LIBRT=
-   LIBS_save=$LIBS
-   AC_SEARCH_LIBS([aio_suspend], [rt],
-     [test "$ac_res" = "none required" || LIBRT=$ac_res])
-   LIBS=$LIBS_save])
+  [AC_CHECK_DECL([_SX], [],
+     [LIBS_save=$LIBS
+      AC_SEARCH_LIBS([aio_suspend], [rt],
+        [test "$ac_res" = "none required" || LIBRT=$ac_res])
+      LIBS=$LIBS_save])])
 #  ----------------------------------------------------------------------
 #  Create the Fortran Interface via iso_c_binding module (Fortran 2003 Standard)
 #

examples/pio/Makefile.am

@@ -16,8 +16,8 @@ endif
 collectData_SOURCES=collectData.c
 
 if USE_MPI
-LDADD=$(top_builddir)/src/libcdipio.la $(LIBRT) $(MPI_C_LIB)
-collectData2003_LDADD=$(top_builddir)/src/libcdipio.la $(LIBRT) $(MPI_FC_LIB)
+LDADD=$(top_builddir)/src/libcdipio.la $(MPI_C_LIB)
+collectData2003_LDADD=$(top_builddir)/src/libcdipio.la $(MPI_FC_LIB)
 else
 LDADD=$(top_builddir)/src/libcdi.la
 collectData2003_LDADD=$(top_builddir)/src/libcdi.la

src/Makefile.am

@@ -261,7 +261,7 @@ libcdipio_la_SOURCES += $(libcdipio_la_HAVE_PARALLEL_NC4_extra_sources)
 endif
 endif
 
-libcdipio_la_LIBADD   = libcdi.la $(PPM_CORE_LIBS) $(YAXT_LIBS) $(MPI_C_LIB)
+libcdipio_la_LIBADD   = libcdi.la $(LIBRT) $(PPM_CORE_LIBS) $(YAXT_LIBS) $(MPI_C_LIB)
 
 #
 #cdilib.c:

tests/Makefile.am

@@ -47,8 +47,8 @@ test_byteswap_SOURCES = test_byteswap.c
 #
 AM_CFLAGS = $(PPM_CORE_CFLAGS) $(YAXT_CFLAGS) $(MPI_C_INCLUDE)
 if USE_MPI
-pio_write_LDADD = ../src/libcdipio.la $(LIBRT) $(MPI_C_LIB)
-pio_write_deco2d_LDADD = ../src/libcdipio.la $(LIBRT) $(MPI_C_LIB)
+pio_write_LDADD = ../src/libcdipio.la $(MPI_C_LIB)
+pio_write_deco2d_LDADD = ../src/libcdipio.la $(MPI_C_LIB)
 TESTS +=  test_resource_copy_mpi_run
 check_PROGRAMS += test_resource_copy_mpi
 test_resource_copy_mpi_LDADD = ../src/libcdipio.la