Bug 1246743 - use libc++ on OS X builds; r=glandium

js/src/old-configure.in

@@ -841,7 +841,7 @@ case "$target" in
     MKCSHLIB='$(CC) $(CFLAGS) $(DSO_PIC_CFLAGS) $(DSO_LDOPTS) -o $@'
     MOZ_OPTIMIZE_FLAGS="-O3 -fno-stack-protector"
     CFLAGS="$CFLAGS -fno-common"
-    CXXFLAGS="$CXXFLAGS -fno-common"
+    CXXFLAGS="$CXXFLAGS -fno-common -stdlib=libc++"
     DLL_SUFFIX=".dylib"
     DSO_LDOPTS=''
     STRIP="$STRIP -x -S"

old-configure.in

@@ -1186,6 +1186,7 @@ case "$target" in
     MKSHLIB='$(CXX) $(CXXFLAGS) $(DSO_PIC_CFLAGS) $(DSO_LDOPTS) -o $@'
     MKCSHLIB='$(CC) $(CFLAGS) $(DSO_PIC_CFLAGS) $(DSO_LDOPTS) -o $@'
     MOZ_OPTIMIZE_FLAGS="-O3"
+    CXXFLAGS="$CXXFLAGS -stdlib=libc++"
     DLL_SUFFIX=".dylib"
     DSO_LDOPTS=''
     STRIP_FLAGS="$STRIP_FLAGS -x -S"