VERSION - add support for versioning libmpi_abi

add a blurb about how current and age and revision
should work for this library.

Signed-off-by: Howard Pritchard <howardp@lanl.gov>

Author: hppritcha

VERSION

@@ -92,6 +92,12 @@ date="Unreleased developer copy"
 # but they are "public" within the OMPI code base and select 3rd party
 # software packages.
 
+# The current and age values of the libmpi_abi shared library are defined by the
+# specification of the ABI for the version of the MPI standard supported
+# by this Open MPI release.  One would hope that these always move in
+# sync.  We assume we have flexibility with the revision number as
+# bugs are fixed, etc.
+
 # Version numbers are described in the Libtool current:revision:age
 # format.
 
@@ -100,6 +106,7 @@ libmpi_mpifh_so_version=0:0:0
 libmpi_usempi_tkr_so_version=0:0:0
 libmpi_usempi_ignore_tkr_so_version=0:0:0
 libmpi_usempif08_so_version=0:0:0
+libmpi_abi_so_version=0:0:0
 libopen_pal_so_version=0:0:0
 libmpi_java_so_version=0:0:0
 liboshmem_so_version=0:0:0

configure.ac

@@ -147,6 +147,7 @@ OPAL_SAVE_VERSION([OPAL], [Open Portable Access Layer], [$srcdir/VERSION],
 
 m4_ifdef([project_ompi],
          [AC_SUBST(libmpi_so_version)
+          AC_SUBST(libmpi_abi_so_version)
           AC_SUBST(libmpi_mpifh_so_version)
           AC_SUBST(libmpi_usempi_tkr_so_version)
           AC_SUBST(libmpi_usempi_ignore_tkr_so_version)

ompi/Makefile.am

@@ -186,6 +186,10 @@ libmpi_abi_la_LIBADD = \
 	mpi/c/libmpi_c_abi.la \
 	mpi/tool/libmpi_mpit_abi.la
 
+libmpi_abi_la_LDFLAGS = \
+       -version-info $(libmpi_abi_so_version) \
+        $(OMPI_LIBMPI_EXTRA_LDFLAGS)
+
 # included subdirectory Makefile.am's and appended-to variables
 headers =
 include_HEADERS =