From b590216005f16efb93f6a2a221208b5f9628f849 Mon Sep 17 00:00:00 2001
From: Ward Fisher <wfisher@ucar.edu>
Date: Wed, 11 Nov 2020 10:51:24 -0700
Subject: [PATCH] Modified plugins/Makefile.am to add -no-undefined as required
 on cygwin.

---
 configure.ac        | 3 ++-
 plugins/Makefile.am | 2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index 2e166be5b..cd2bc58a4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1195,7 +1195,7 @@ if test "x$enable_hdf5" = xyes; then
    # See if H5Dread_chunk is available
    AC_SEARCH_LIBS([H5Dread_chunk],[hdf5_hldll hdf5_hl], [has_readchunks=yes], [has_readdhunks=no])
 
-   # See if hdf5 library supports Read-Only S3 (byte-range) driver 
+   # See if hdf5 library supports Read-Only S3 (byte-range) driver
    AC_SEARCH_LIBS([H5Pset_fapl_ros3],[hdf5_hldll hdf5_hl], [has_ros3=yes], [has_ros3=no])
    if test "x$has_ros3" = xyes; then
     AC_DEFINE([ENABLE_HDF5_ROS3], [1], [if true, support byte-range using hdf5 virtual file driver.])
@@ -1476,6 +1476,7 @@ AC_MSG_RESULT([$BINFILE_NAME $FC $CXX])
 # Bugfix for Cygwin.
 ##
 AC_MSG_CHECKING([if libtool needs -no-undefined flag to build shared libraries])
+NOUNDEFINED=""
 case "`uname`" in
      CYGWIN*|MINGW*|AIX*)
      ## Add in the -no-undefined flag to LDFLAGS for libtool.
diff --git a/plugins/Makefile.am b/plugins/Makefile.am
index 7102293c8..97b54d098 100644
--- a/plugins/Makefile.am
+++ b/plugins/Makefile.am
@@ -5,7 +5,7 @@
 include $(top_srcdir)/lib_flags.am
 
 AM_LDFLAGS += -module -avoid-version -shared -export-dynamic	\
- -rpath ${abs_builddir}
+ -rpath ${abs_builddir} ${NOUNDEFINED}
 
 BZIP2HDRS = bzlib.h bzlib_private.h
 BZIP2SRC = blocksort.c huffman.c crctable.c randtable.c compress.c decompress.c bzlib.c