Fix searching for C++ system headers for cross compilers

ChangeLog

@@ -1,3 +1,8 @@
+2011-10-15  Andreas Schwab  <schwab@linux-m68k.org>
+
+	* configure.in: Also look in $cxxmachine/include for C++ system
+	headers.
+
 2011-09-27  Liubov Dmitrieva  <liubov.dmitrieva@gmail.com>
 
 	* sysdeps/x86_64/multiarch/Makefile: (sysdep_routines): Add

configure

@@ -5372,11 +5372,16 @@ if test -n "$sysheaders"; then
   SYSINCLUDES="$SYSINCLUDES \
 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
   if test -n "$CXX"; then
+    CXX_SYSINCLUDES=
     cxxversion=`$CXX -dumpversion 2>&5` &&
     cxxmachine=`$CXX -dumpmachine 2>&5` &&
-    cxxheaders=`$CXX -print-file-name=../../../../include/c++/`"$cxxversion" &&
-    CXX_SYSINCLUDES="-isystem $cxxheaders \
+    for d in include "$cxxmachine/include"; do
+      i=../../../../$d/c++/$cxxversion
+      cxxheaders=`$CXX -print-file-name="$i"` &&
+      test "x$cxxheaders" != x && test "x$i" != "x$cxxheaders" &&
+      CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders \
 -isystem $cxxheaders/$cxxmachine -isystem $cxxheaders/backward"
+    done
   fi
 fi
 

configure.in

@@ -1061,11 +1061,16 @@ if test -n "$sysheaders"; then
   SYSINCLUDES="$SYSINCLUDES \
 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
   if test -n "$CXX"; then
+    CXX_SYSINCLUDES=
     cxxversion=`$CXX -dumpversion 2>&AS_MESSAGE_LOG_FD` &&
     cxxmachine=`$CXX -dumpmachine 2>&AS_MESSAGE_LOG_FD` &&
-    cxxheaders=`$CXX -print-file-name=../../../../include/c++/`"$cxxversion" &&
-    CXX_SYSINCLUDES="-isystem $cxxheaders \
+    for d in include "$cxxmachine/include"; do
+      i=../../../../$d/c++/$cxxversion
+      cxxheaders=`$CXX -print-file-name="$i"` &&
+      test "x$cxxheaders" != x && test "x$i" != "x$cxxheaders" &&
+      CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders \
 -isystem $cxxheaders/$cxxmachine -isystem $cxxheaders/backward"
+    done
   fi
 fi
 AC_SUBST(SYSINCLUDES)