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On darwin8, no need to use flat namespace for libstdc++


As of Tiger8A347, the dynamic linker is finally fixed so that new and
delete can be overridden without needing to build both libstdc++ and
your executable with -flat_namespace.  Yay!  We can now remove that
workaround.  I've assumed that plain "darwin" means "not sure, please
try to make it work in all circumstances".

Bootstrapped & tested on powerpc-darwin8, verified that it does not
change the testsuite results.  Also verified that the tests in the C++
testsuite that override new & delete still pass and do not
use -flat_namespace.

-- 
- Geoffrey Keating <geoffk@apple.com>

===File ~/patches/gcc-3168188.patch=========================
2005-01-13  Geoffrey Keating  <geoffk@apple.com>

	* configure.host (darwin): On darwin8 or later, no need to build
	libstdc++ with -flat_namespace.

Index: configure.host
===================================================================
RCS file: /cvs/gcc/gcc/libstdc++-v3/configure.host,v
retrieving revision 1.33
diff -u -p -u -p -r1.33 configure.host
--- configure.host	28 Dec 2004 16:34:15 -0000	1.33
+++ configure.host	13 Jan 2005 22:24:43 -0000
@@ -174,13 +174,19 @@ case "${host_os}" in
   cygwin*)
     os_include_dir="os/newlib"
     ;;
-  darwin*)
+  darwin | darwin[1-7] | darwin[1-7].*)
     # On Darwin, performance is improved if libstdc++ is single-module.
-    # Up to at least 10.3.5, -flat_namespace is required for proper
+    # Up to at least 10.3.7, -flat_namespace is required for proper
     # treatment of coalesced symbols.
     OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module -Wl,-flat_namespace"
     os_include_dir="os/bsd/darwin"
     ;;
+  darwin[89] | darwin[89].* | darwin[1-9][0-9]* )
+    # On Darwin, performance is improved if libstdc++ is single-module,
+    # and on 8+ compatibility is better if not -flat_namespace.
+    OPT_LDFLAGS="${OPT_LDFLAGS} -Wl,-single_module"
+    os_include_dir="os/bsd/darwin"
+    ;;
   *djgpp*)      # leading * picks up "msdosdjgpp"
     os_include_dir="os/djgpp"
     ;;
============================================================


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