-single_module is obsolete in macOS

Author: jan.nijtmans

ChangeLog

@@ -327,7 +327,7 @@
 
 2007-09-15  Daniel Steffen  <[email protected]>
 
-	* tcl.m4: 	replace all direct references to compiler by ${CC} to
+	* tcl.m4:	replace all direct references to compiler by ${CC} to
 			enable CC overriding at configure & make time.
 	(SunOS-5.1x):	replace direct use of '/usr/ccs/bin/ld' in SHLIB_LD by
 			'cc' compiler driver.

tcl.m4

@@ -1293,7 +1293,7 @@ AC_DEFUN([TEA_CONFIG_CFLAGS], [
 	    SHARED_LIB_SUFFIX='${TCL_TRIM_DOTS}.dll'
 
 	    TCL_LIB_VERSIONS_OK=nodots
-    	    ;;
+	    ;;
 	AIX-*)
 	    AS_IF([test "$GCC" != "yes"], [
 		# AIX requires the _r compiler when gcc isn't being used
@@ -1303,7 +1303,7 @@ AC_DEFUN([TEA_CONFIG_CFLAGS], [
 			;;
 		    *)
 			# Make sure only first arg gets _r
-		    	CC=`echo "$CC" | sed -e 's/^\([[^ ]]*\)/\1_r/'`
+			CC=`echo "$CC" | sed -e 's/^\([[^ ]]*\)/\1_r/'`
 			;;
 		esac
 		AC_MSG_RESULT([Using $CC for compiling with threads])
@@ -1661,15 +1661,6 @@ AC_DEFUN([TEA_CONFIG_CFLAGS], [
 	    ])
 	    # TEA specific: use LDFLAGS_DEFAULT instead of LDFLAGS
 	    SHLIB_LD='${CC} -dynamiclib ${CFLAGS} ${LDFLAGS_DEFAULT}'
-	    AC_CACHE_CHECK([if ld accepts -single_module flag], tcl_cv_ld_single_module, [
-		hold_ldflags=$LDFLAGS
-		LDFLAGS="$LDFLAGS -dynamiclib -Wl,-single_module"
-		AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], [[int i;]])],
-			[tcl_cv_ld_single_module=yes],[tcl_cv_ld_single_module=no])
-		LDFLAGS=$hold_ldflags])
-	    AS_IF([test $tcl_cv_ld_single_module = yes], [
-		SHLIB_LD="${SHLIB_LD} -Wl,-single_module"
-	    ])
 	    # TEA specific: link shlib with current and compatibility version flags
 	    vers=`echo ${PACKAGE_VERSION} | sed -e 's/^\([[0-9]]\{1,5\}\)\(\(\.[[0-9]]\{1,3\}\)\{0,2\}\).*$/\1\2/p' -e d`
 	    SHLIB_LD="${SHLIB_LD} -current_version ${vers:-0} -compatibility_version ${vers:-0}"
@@ -3417,7 +3408,7 @@ AC_DEFUN([TEA_PRIVATE_TCL_HEADERS], [
 	    # If Tcl was built as a framework, attempt to use
 	    # the framework's Headers and PrivateHeaders directories
 	    case ${TCL_DEFS} in
-	    	*TCL_FRAMEWORK*)
+		*TCL_FRAMEWORK*)
 		    if test -d "${TCL_BIN_DIR}/Headers" -a \
 			    -d "${TCL_BIN_DIR}/PrivateHeaders"; then
 			TCL_INCLUDES="-I\"${TCL_BIN_DIR}/Headers\" -I\"${TCL_BIN_DIR}/PrivateHeaders\" ${TCL_INCLUDES}"