imported two libtool mainstream commits 28fbcb6a and b55b1cc8

acinclude/libtool.m4

@@ -1068,7 +1068,7 @@ _LT_EOF
     darwin1.*)
       _lt_dar_allow_undefined='$wl-flat_namespace $wl-undefined ${wl}suppress' ;;
     darwin*)
-      case ${MACOSX_DEPLOYMENT_TARGET},$host in
+      case $MACOSX_DEPLOYMENT_TARGET,$host in
         10.[[012]],*|,*powerpc*-darwin[[5-8]]*)
           _lt_dar_allow_undefined='$wl-flat_namespace $wl-undefined ${wl}suppress' ;;
         *)

build-scripts/ltmain.sh

@@ -7081,8 +7081,20 @@ func_mode_link ()
 	prev=xcompiler
 	continue
 	;;
-
-      -mt|-mthreads|-kthread|-Kthread|-pthread|-pthreads|--thread-safe \
+     # Solaris ld rejects as of 11.4. Refer to Oracle bug 22985199.
+     -pthread)
+	case $host in
+	  *solaris2*) ;;
+	  *)
+	    case "$new_inherited_linker_flags " in
+	        *" $arg "*) ;;
+	        * ) func_append new_inherited_linker_flags " $arg" ;;
+	    esac
+	  ;;
+	esac
+	continue
+	;;
+      -mt|-mthreads|-kthread|-Kthread|-pthreads|--thread-safe \
       |-threads|-fopenmp|-openmp|-mp|-xopenmp|-omp|-qsmp=*)
 	func_append compiler_flags " $arg"
 	func_append compile_command " $arg"

configure

@@ -7124,7 +7124,7 @@ $as_echo "$lt_cv_ld_force_load" >&6; }
     darwin1.*)
       _lt_dar_allow_undefined='$wl-flat_namespace $wl-undefined ${wl}suppress' ;;
     darwin*)
-      case ${MACOSX_DEPLOYMENT_TARGET},$host in
+      case $MACOSX_DEPLOYMENT_TARGET,$host in
         10.[012],*|,*powerpc*-darwin[5-8]*)
           _lt_dar_allow_undefined='$wl-flat_namespace $wl-undefined ${wl}suppress' ;;
         *)