config, toplevel, Darwin: Pass -B instead of -L to C++ commands.

Darwin from 10.11 needs embedded rpaths to find the correct libraries at
runtime.  Recent increases in hardening have made it such that the dynamic
loader will no longer fall back to using an installed libstdc++ when the
(new) linked one is not found.  This means we fail configure tests (that
should pass) for runtimes that use C++.

We can resolve this by passing '-B' to the C++ command lines instead of '-L'
(-B implies -L on Darwin, but also causes a corresponding embedded rpath).

ChangeLog:

	* configure: Regenerate.
	* configure.ac: Use -B instead of -L to specifiy the C++ runtime
	paths on Darwin.

Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>

2 files changed, 112 insertions, 4 deletions

diff --git a/configure b/configure
index 036142a..bf574ef 100755
--- a/configure
+++ b/configure
@@ -19081,7 +19081,101 @@ $as_echo "pre-installed" >&6; }
   fi
 fi
 
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking where to find the target c++" >&5
+case $target in
+  *-*-darwin*)
+    { $as_echo "$as_me:${as_lineno-$LINENO}: checking where to find the target c++" >&5
+$as_echo_n "checking where to find the target c++... " >&6; }
+if test "x${build}" != "x${host}" ; then
+  if expr "x$CXX_FOR_TARGET" : "x/" > /dev/null; then
+    # We already found the complete path
+    ac_dir=`dirname $CXX_FOR_TARGET`
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: pre-installed in $ac_dir" >&5
+$as_echo "pre-installed in $ac_dir" >&6; }
+  else
+    # Canadian cross, just use what we found
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: pre-installed" >&5
+$as_echo "pre-installed" >&6; }
+  fi
+else
+  ok=yes
+  case " ${configdirs} " in
+    *" gcc "*) ;;
+    *) ok=no ;;
+  esac
+  case ,${enable_languages}, in
+    *,c++,*) ;;
+    *) ok=no ;;
+  esac
+  if test $ok = yes; then
+    # An in-tree tool is available and we can use it
+    CXX_FOR_TARGET='$$r/$(HOST_SUBDIR)/gcc/xg++ -B$$r/$(HOST_SUBDIR)/gcc/ -nostdinc++ `if test -f $$r/$(TARGET_SUBDIR)/libstdc++-v3/scripts/testsuite_flags; then $(SHELL) $$r/$(TARGET_SUBDIR)/libstdc++-v3/scripts/testsuite_flags --build-includes; else echo -funconfigured-libstdc++-v3 ; fi` -B$$r/$(TARGET_SUBDIR)/libstdc++-v3/src -B$$r/$(TARGET_SUBDIR)/libstdc++-v3/src/.libs -B$$r/$(TARGET_SUBDIR)/libstdc++-v3/libsupc++/.libs'
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: just compiled" >&5
+$as_echo "just compiled" >&6; }
+  elif expr "x$CXX_FOR_TARGET" : "x/" > /dev/null; then
+    # We already found the complete path
+    ac_dir=`dirname $CXX_FOR_TARGET`
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: pre-installed in $ac_dir" >&5
+$as_echo "pre-installed in $ac_dir" >&6; }
+  elif test "x$target" = "x$host"; then
+    # We can use an host tool
+    CXX_FOR_TARGET='$(CXX)'
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: host tool" >&5
+$as_echo "host tool" >&6; }
+  else
+    # We need a cross tool
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: pre-installed" >&5
+$as_echo "pre-installed" >&6; }
+  fi
+fi
+
+    { $as_echo "$as_me:${as_lineno-$LINENO}: checking where to find the target c++ for libstdc++" >&5
+$as_echo_n "checking where to find the target c++ for libstdc++... " >&6; }
+if test "x${build}" != "x${host}" ; then
+  if expr "x$RAW_CXX_FOR_TARGET" : "x/" > /dev/null; then
+    # We already found the complete path
+    ac_dir=`dirname $RAW_CXX_FOR_TARGET`
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: pre-installed in $ac_dir" >&5
+$as_echo "pre-installed in $ac_dir" >&6; }
+  else
+    # Canadian cross, just use what we found
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: pre-installed" >&5
+$as_echo "pre-installed" >&6; }
+  fi
+else
+  ok=yes
+  case " ${configdirs} " in
+    *" gcc "*) ;;
+    *) ok=no ;;
+  esac
+  case ,${enable_languages}, in
+    *,c++,*) ;;
+    *) ok=no ;;
+  esac
+  if test $ok = yes; then
+    # An in-tree tool is available and we can use it
+    RAW_CXX_FOR_TARGET='$$r/$(HOST_SUBDIR)/gcc/xgcc -shared-libgcc -B$$r/$(HOST_SUBDIR)/gcc -nostdinc++ -B$$r/$(TARGET_SUBDIR)/libstdc++-v3/src -B$$r/$(TARGET_SUBDIR)/libstdc++-v3/src/.libs -B$$r/$(TARGET_SUBDIR)/libstdc++-v3/libsupc++/.libs'
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: just compiled" >&5
+$as_echo "just compiled" >&6; }
+  elif expr "x$RAW_CXX_FOR_TARGET" : "x/" > /dev/null; then
+    # We already found the complete path
+    ac_dir=`dirname $RAW_CXX_FOR_TARGET`
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: pre-installed in $ac_dir" >&5
+$as_echo "pre-installed in $ac_dir" >&6; }
+  elif test "x$target" = "x$host"; then
+    # We can use an host tool
+    RAW_CXX_FOR_TARGET='$(CXX)'
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: host tool" >&5
+$as_echo "host tool" >&6; }
+  else
+    # We need a cross tool
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: pre-installed" >&5
+$as_echo "pre-installed" >&6; }
+  fi
+fi
+
+  ;;
+  *)
+    { $as_echo "$as_me:${as_lineno-$LINENO}: checking where to find the target c++" >&5
 $as_echo_n "checking where to find the target c++... " >&6; }
 if test "x${build}" != "x${host}" ; then
   if expr "x$CXX_FOR_TARGET" : "x/" > /dev/null; then
@@ -19126,7 +19220,7 @@ $as_echo "pre-installed" >&6; }
   fi
 fi
 
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking where to find the target c++ for libstdc++" >&5
+    { $as_echo "$as_me:${as_lineno-$LINENO}: checking where to find the target c++ for libstdc++" >&5
 $as_echo_n "checking where to find the target c++ for libstdc++... " >&6; }
 if test "x${build}" != "x${host}" ; then
   if expr "x$RAW_CXX_FOR_TARGET" : "x/" > /dev/null; then
@@ -19171,6 +19265,8 @@ $as_echo "pre-installed" >&6; }
   fi
 fi
 
+  ;;
+esac
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking where to find the target dlltool" >&5
 $as_echo_n "checking where to find the target dlltool... " >&6; }
 if test "x${build}" != "x${host}" ; then
diff --git a/configure.ac b/configure.ac
index 6cf9893..3e120b0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -4061,12 +4061,24 @@ GCC_TARGET_TOOL(ar, AR_FOR_TARGET, AR, [binutils/ar])
 GCC_TARGET_TOOL(as, AS_FOR_TARGET, AS, [gas/as-new])
 GCC_TARGET_TOOL(cc, CC_FOR_TARGET, CC, [gcc/xgcc -B$$r/$(HOST_SUBDIR)/gcc/])
 dnl see comments for CXX_FOR_TARGET_FLAG_TO_PASS
-GCC_TARGET_TOOL(c++, CXX_FOR_TARGET, CXX,
+case $target in
+  *-*-darwin*)
+    GCC_TARGET_TOOL(c++, CXX_FOR_TARGET, CXX,
+		[gcc/xg++ -B$$r/$(HOST_SUBDIR)/gcc/ -nostdinc++ `if test -f $$r/$(TARGET_SUBDIR)/libstdc++-v3/scripts/testsuite_flags; then $(SHELL) $$r/$(TARGET_SUBDIR)/libstdc++-v3/scripts/testsuite_flags --build-includes; else echo -funconfigured-libstdc++-v3 ; fi` -B$$r/$(TARGET_SUBDIR)/libstdc++-v3/src -B$$r/$(TARGET_SUBDIR)/libstdc++-v3/src/.libs -B$$r/$(TARGET_SUBDIR)/libstdc++-v3/libsupc++/.libs],
+		c++)
+    GCC_TARGET_TOOL(c++ for libstdc++, RAW_CXX_FOR_TARGET, CXX,
+		[gcc/xgcc -shared-libgcc -B$$r/$(HOST_SUBDIR)/gcc -nostdinc++ -B$$r/$(TARGET_SUBDIR)/libstdc++-v3/src -B$$r/$(TARGET_SUBDIR)/libstdc++-v3/src/.libs -B$$r/$(TARGET_SUBDIR)/libstdc++-v3/libsupc++/.libs],
+		c++)
+  ;;
+  *)
+    GCC_TARGET_TOOL(c++, CXX_FOR_TARGET, CXX,
 		[gcc/xg++ -B$$r/$(HOST_SUBDIR)/gcc/ -nostdinc++ `if test -f $$r/$(TARGET_SUBDIR)/libstdc++-v3/scripts/testsuite_flags; then $(SHELL) $$r/$(TARGET_SUBDIR)/libstdc++-v3/scripts/testsuite_flags --build-includes; else echo -funconfigured-libstdc++-v3 ; fi` -L$$r/$(TARGET_SUBDIR)/libstdc++-v3/src -L$$r/$(TARGET_SUBDIR)/libstdc++-v3/src/.libs -L$$r/$(TARGET_SUBDIR)/libstdc++-v3/libsupc++/.libs],
 		c++)
-GCC_TARGET_TOOL(c++ for libstdc++, RAW_CXX_FOR_TARGET, CXX,
+    GCC_TARGET_TOOL(c++ for libstdc++, RAW_CXX_FOR_TARGET, CXX,
 		[gcc/xgcc -shared-libgcc -B$$r/$(HOST_SUBDIR)/gcc -nostdinc++ -L$$r/$(TARGET_SUBDIR)/libstdc++-v3/src -L$$r/$(TARGET_SUBDIR)/libstdc++-v3/src/.libs -L$$r/$(TARGET_SUBDIR)/libstdc++-v3/libsupc++/.libs],
 		c++)
+  ;;
+esac
 GCC_TARGET_TOOL(dlltool, DLLTOOL_FOR_TARGET, DLLTOOL, [binutils/dlltool])
 GCC_TARGET_TOOL(dsymutil, DSYMUTIL_FOR_TARGET, DSYMUTIL)
 GCC_TARGET_TOOL(gcc, GCC_FOR_TARGET, , [gcc/xgcc -B$$r/$(HOST_SUBDIR)/gcc/])