diff --git a/configure.ac b/configure.ac
index 15f7bb4e69e..37252d9a76a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1074,14 +1074,6 @@ 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"
-  ## 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_LDFLAGS="$H5_LDFLAGS -Wl,-commons,use_dylibs"
-    ;;
-  esac
 
   ## Report results of check(s)
 
diff --git a/fortran/src/H5_ff.F90 b/fortran/src/H5_ff.F90
index 7bd2e261929..68b3dd874bb 100644
--- a/fortran/src/H5_ff.F90
+++ b/fortran/src/H5_ff.F90
@@ -12,8 +12,6 @@
 ! PURPOSE
 !  This module is used to pass C stubs for H5 Fortran APIs. The C stubs are
 !  packed into arrays in H5_f.c and these arrays are then passed to Fortran.
-!  This module then uses EQUIVALENCE to assign elements of the arrays to
-!  Fortran equivalent C stubs.
 !
 ! NOTES
 !  The size of the C arrays in H5_f.c has to match the values of the variables
diff --git a/release_docs/RELEASE.txt b/release_docs/RELEASE.txt
index f48493a71d5..2a4ea61b13e 100644
--- a/release_docs/RELEASE.txt
+++ b/release_docs/RELEASE.txt
@@ -265,6 +265,11 @@ New Features
       h5pget_file_space_page_size_f, h5pset_file_space_page_size_f,
       h5pget_file_space_strategy_f, h5pset_file_space_strategy_f
 
+    - Removed "-commons" linking option on Darwin, as COMMON and EQUIVALENCE
+      are no longer used in the Fortran source.
+
+      Fixes GitHub issue #3571
+
     C++ Library:
     ------------
     -
diff --git a/src/H5FDmpio.c b/src/H5FDmpio.c
index d2377cbc394..9149d2b0809 100644
--- a/src/H5FDmpio.c
+++ b/src/H5FDmpio.c
@@ -559,13 +559,13 @@ H5Pget_dxpl_mpio(hid_t dxpl_id, H5FD_mpio_xfer_t *xfer_mode /*out*/)
 /*-------------------------------------------------------------------------
  * Function:    H5Pset_dxpl_mpio_collective_opt
  *
- * Purpose:     To set a flag to choose linked chunk I/O or multi-chunk I/O
- *              without involving decision-making inside HDF5
- *
- * Note:        The library will do linked chunk I/O or multi-chunk I/O without
- *              involving communications for decision-making process.
- *              The library won't behave as it asks for only when we find
- *              that the low-level MPI-IO package doesn't support this.
+ * Purpose:     Set the data transfer property list DXPL_ID to use transfer
+ *              mode OPT_MODE during I/O. This allows the application to
+ *              specify collective I/O at the HDF5 interface level (with
+ *              the H5Pset_dxpl_mpio routine), while controlling whether
+ *              the actual I/O is performed collectively (e.g., via
+ *              MPI_File_write_at_all) or independently (e.g., via
+ *              MPI_File_write_at).
  *
  * Return:      Success:    Non-negative
  *              Failure:    Negative
@@ -2032,7 +2032,7 @@ H5FD__mpio_vector_build_types(uint32_t count, H5FD_mem_t types[], haddr_t addrs[
 /*-------------------------------------------------------------------------
  * Function:    H5FD__mpio_read_vector()
  *
- * Purpose:     The behaviour of this function dependes on the value of
+ * Purpose:     The behavior of this function depends on the value of
  *              the io_xfer_mode obtained from the context.
  *
  *              If it is H5FD_MPIO_COLLECTIVE, this is a collective
diff --git a/src/H5FDmpio.h b/src/H5FDmpio.h
index 36786016dfe..96a93668ea7 100644
--- a/src/H5FDmpio.h
+++ b/src/H5FDmpio.h
@@ -164,18 +164,24 @@ H5_DLL herr_t H5Pget_dxpl_mpio(hid_t dxpl_id, H5FD_mpio_xfer_t *xfer_mode /*out*
 /**
  * \ingroup DXPL
  *
- * \brief Sets data transfer mode
+ * \brief Sets low-level data transfer mode
  *
  * \dxpl_id
  * \param[in] opt_mode Transfer mode
  * \returns \herr_t
  *
- * \details H5Pset_dxpl_mpio() sets the data transfer property list \p dxpl_id
- *          to use transfer mode xfer_mode. The property list can then be used
- *          to control the I/O transfer mode during data I/O operations.
- *
- *          Valid transfer modes are #H5FD_MPIO_INDEPENDENT (default) and
- *          #H5FD_MPIO_COLLECTIVE.
+ * \details H5Pset_dxpl_mpio_collective_opt() sets the data transfer property
+ *          list \p dxpl_id to use transfer mode \p opt_mode when performing
+ *          I/O. This allows the application to specify collective I/O at the
+ *          HDF5 interface level (with the H5Pset_dxpl_mpio() API routine),
+ *          while controlling whether the actual I/O is performed collectively
+ *          (e.g., via MPI_File_write_at_all) or independently (e.g., via
+ *          MPI_File_write_at). If the collectivity setting at the HDF5
+ *          interface level (set via H5Pset_dxpl_mpio()) is not set to
+ *          H5FD_MPIO_COLLECTIVE, this setting will be ignored.
+ *
+ *          Valid transfer modes are #H5FD_MPIO_COLLECTIVE_IO (default) and
+ *          #H5FD_MPIO_INDIVIDUAL_IO.
  *
  * \since 1.4.0
  *
diff --git a/src/H5FDs3comms.c b/src/H5FDs3comms.c
index b3fb2c16277..4ea0b622494 100644
--- a/src/H5FDs3comms.c
+++ b/src/H5FDs3comms.c
@@ -2755,7 +2755,7 @@ H5FD_s3comms_trim(char *dest, char *s, size_t s_len, size_t *n_written)
         /* Find first non-whitespace character from start;
          * reduce total length per character.
          */
-        while ((s_len > 0) && isspace((unsigned char)s[0]) && s_len > 0) {
+        while (s_len > 0 && isspace((unsigned char)s[0])) {
             s++;
             s_len--;
         }