From 133168d8fcd5210c66d65ba3c1b349f72fd39f0f Mon Sep 17 00:00:00 2001
From: "M. Scot Breitenfeld" <brtnfld@hdfgroup.org>
Date: Tue, 23 May 2017 10:21:18 -0500
Subject: Fixed for building shared fortran libraries on OS X, HDFFV-2772

---
 configure.ac | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/configure.ac b/configure.ac
index 7f34ad6c..a5b69c8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -644,14 +644,13 @@ H5_FORTRAN_SHARED="no"
 if test "X${HDF_FORTRAN}" = "Xyes" && test "X${enable_shared}" != "Xno"; then
   AC_MSG_CHECKING([if shared Fortran libraries are supported])
   H5_FORTRAN_SHARED="yes"
-
-  ## Disable fortran shared libraries on Mac. (MAM - 03/30/11)
-  
+  ## tell libtool to do the right thing with COMMON symbols, this fixes 
+  ## corrupt values with COMMON and EQUIVALENCE when building shared 
+  ## Fortran libraries on OSX with gnu and Intel compilers (HDFFV-2772).
   case "`uname`" in
     Darwin*)
-    H5_FORTRAN_SHARED="no"
-    CHECK_WARN="Shared Fortran libraries not currently supported on Mac."
-      ;;
+    H5_LDFLAGS="$H5_LDFLAGS -Wl,-commons,use_dylibs"
+    ;;
   esac
 
   ## Report results of check(s)
@@ -3003,6 +3002,14 @@ chmod 755 tools/misc/h5cc
 
 if test "X$HDF_FORTRAN" = "Xyes"; then
   chmod 755 fortran/src/h5fc
+  ## libtool does not pass the correct argument linker (wl=) for the Intel Fortran compiler 
+  ## on OS X, which is needed when building shared libraries on OS X.  This script 
+  ## replaces the 3rd occurrence, which is for Fortran, of wl="" with wl="-Wl," (HDFFV-2772)
+  case "`uname`" in
+    Darwin*)
+      cat libtool | awk '/wl=\"/{c++;if(c==3){sub("wl=\"\"","wl=\"-Wl,\"");c=0}}1' > libtool.tmp && mv -f libtool.tmp libtool && chmod 755 libtool
+      ;;
+  esac
 fi
 
 if test "X$HDF_CXX" = "Xyes"; then
-- 
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