[svn-r27756] Merge of r27692 from trunk

Changed the autotools files so that the high-level library is unsupported
when building the thread-safe library.

Configure will quit with an error when --disable-hl or
--enable-unsupported is not used with --enable-threadsafe.

Fixes HDFFV-8719

Tested on: h5committest
           configure w/ various combinations of --enable-threadsafe,
           --disable-hl, and --enable-unsupported

1 files changed, 13 insertions, 1 deletions

diff --git a/configure.ac b/configure.ac
index af391da..e058a49 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1377,9 +1377,21 @@ AC_CACHE_SAVE
 AC_MSG_CHECKING([for thread safe support])
 AC_ARG_ENABLE([threadsafe],
               [AS_HELP_STRING([--enable-threadsafe],
-                              [Enable thread-safe capability])],
+                              [Enable thread-safe capability. Not compatible with the high-level library, Fortran, or C++ wrappers.
+                              [default=no]])],
               [THREADSAFE=$enableval])
 
+## --enable-threadsafe is incompatible with --enable-hl unless
+## --enable-unsupported has been specified on the configure line.
+##
+## Note that the high-level library is enabled by default so most
+## users will have to add --disable-hl to the configure options.
+if test "X${ALLOW_UNSUPPORTED}" != "Xyes"; then
+  if test "X${HDF5_HL}" = "Xyes" -a "X${enable_threadsafe}" = "Xyes"; then
+    AC_MSG_ERROR([The thread-safe library is incompatible with the high-level library. --disable-hl can be used to prevent building the high-level library (recommended). Alternatively, --enable-unsupported will allow building the high-level library, though this configuration is not supported by The HDF Group.])
+  fi
+fi
+
 ## The --enable-threadsafe flag is not compatible with --enable-cxx.
 ## If the user tried to specify both flags, throw an error, unless
 ## they also provided the --enable-unsupported flag.