winsup/ChangeLog:

* Makefile.common (COMPILE_CXX): Add support for per-file overrides
	to exclude $(nostdinc) and $(nostdincxx) from compiler flags.
	(COMPILE_CC): Likewise for $(nostdinc).

winsup/cygwin/ChangeLog:

	* Makefile.in (DLL_OFILES): Add libstdcxx_wrapper.o
	(libstdcxx_wrapper_CFLAGS): Add flags for new module.
	(_cygwin_crt0_common_STDINCFLAGS): Define per-file override.
	(libstdcxx_wrapper_STDINCFLAGS, cxx_STDINCFLAGS): Likewise.
	* cxx.cc: Include "cygwin-cxx.h".
	(operator new): Tweak prototype for full standards compliance.
	(operator new[]): Likewise.
	(operator new (nothrow)): New fallback function.
	(operator new[] (nothrow), operator delete (nothrow),
	operator delete[] (nothrow)): Likewise.
	(default_cygwin_cxx_malloc): New struct of pointers to the above,
	for final last-resort fallback default.
	* cygwin-cxx.h: New file.
	(struct per_process_cxx_malloc): Define.
	(default_cygwin_cxx_malloc): Declare extern.
	* cygwin.din (__wrap__ZdaPv): Export new wrapper.
	(__wrap__ZdaPvRKSt9nothrow_t, __wrap__ZdlPv,
	__wrap__ZdlPvRKSt9nothrow_t, __wrap__Znaj,
	__wrap__ZnajRKSt9nothrow_t, __wrap__Znwj,
	__wrap__ZnwjRKSt9nothrow_t): Likewise.
	* globals.cc (__cygwin_user_data): Init newly-repurposed 'forkee'
	field (now 'cxx_malloc') to point to default_cygwin_cxx_malloc.
	* libstdcxx_wrapper.cc: New file.
	(__wrap__ZdaPv, __wrap__ZdaPvRKSt9nothrow_t, __wrap__ZdlPv,
	__wrap__ZdlPvRKSt9nothrow_t, __wrap__Znaj,
	__wrap__ZnajRKSt9nothrow_t, __wrap__Znwj,
	__wrap__ZnwjRKSt9nothrow_t): Define wrapper functions for libstdc++
	malloc operators and their overrides.
	* winsup.h (default_cygwin_cxx_malloc): Declare extern.
	* include/cygwin/version.h (CYGWIN_VERSION_API_MINOR): Bump.
	* include/sys/cygwin.h (struct per_process_cxx_malloc): Forward
	declare here.
	(struct per_process::forkee): Rename and repurpose from this ...
	(struct per_process::cxx_malloc): ... to this.
	* lib/_cygwin_crt0_common.cc: Include cygwin-cxx.h.
	(WEAK): Define shorthand helper macro.
	(__cygwin_cxx_malloc): Define and populate with weak references
	to whatever libstdc++ malloc operators will be visible at final
	link time for Cygwin apps and dlls.
	(_cygwin_crt0_common): Always look up cygwin DLL's internal
	per_process data, and don't test for (impossible) failure.  Inherit
	any members of __cygwin_cxx_malloc that we don't have overrides
	for from the DLL's default and store the resulting overall set of
	overrides back into the DLL's global per_process data.

winsup/cygwin/cxx.cc

@@ -11,9 +11,14 @@ details. */
 #if (__GNUC__ >= 3)
 
 #include "winsup.h"
+#include "cygwin-cxx.h"
+
+/* These implementations of operators new and delete are used internally by
+   the DLL, and are kept separate from the user's/libstdc++'s versions by
+   use of LD's --wrap option.  */
 
 void *
-operator new (size_t s)
+operator new (std::size_t s)
 {
   void *p = calloc (1, s);
   return p;
@@ -26,7 +31,7 @@ operator delete (void *p)
 }
 
 void *
-operator new[] (size_t s)
+operator new[] (std::size_t s)
 {
   return ::operator new (s);
 }
@@ -37,6 +42,34 @@ operator delete[] (void *p)
   ::operator delete (p);
 }
 
+/* Nothrow versions, provided only for completeness in the fallback array.  */
+
+void *
+operator new (std::size_t s, const std::nothrow_t &)
+{
+  void *p = calloc (1, s);
+  return p;
+}
+
+void
+operator delete (void *p, const std::nothrow_t &)
+{
+  free (p);
+}
+
+void *
+operator new[] (std::size_t s, const std::nothrow_t &nt)
+{
+  return ::operator new (s, nt);
+}
+
+void
+operator delete[] (void *p, const std::nothrow_t &nt)
+{
+  ::operator delete (p, nt);
+}
+
+
 extern "C" void
 __cxa_pure_virtual (void)
 {
@@ -52,4 +85,21 @@ extern "C" void
 __cxa_guard_release ()
 {
 }
+
+/* These routines are made available as last-resort fallbacks
+   for the application.  Should not be used in practice.  */
+
+struct per_process_cxx_malloc default_cygwin_cxx_malloc = 
+{
+  &(operator new),
+  &(operator new[]),
+  &(operator delete),
+  &(operator delete[]),
+  &(operator new),
+  &(operator new[]),
+  &(operator delete),
+  &(operator delete[]),
+};
+
+
 #endif