Index: gcc/ChangeLog

2006-02-24  Geoffrey Keating  <geoffk@apple.com>

	* doc/tm.texi (Run-time Target): Document C_COMMON_OVERRIDE_OPTIONS.
	* doc/invoke.texi (C++ Dialect Options): Document 
	-fno-use-cxa-get-exception-ptr.
	* configure.ac: Define DEFAULT_USE_CXA_ATEXIT to 2 not 1.
	* configure: Regenerate.
	* c.opt (fuse-cxa-get-exception-ptr): New.
	* c-opts.c (c_common_handle_option): Handle
	OPT_fuse_cxa_get_exception_ptr.
	* c-common.c (flag_use_cxa_atexit): Update documentation.
	(flag_use_cxa_get_exception_ptr): New.
	* c-common.h (flag_use_cxa_get_exception_ptr): New.
	* config/rs6000/darwin.h (SUBTARGET_OVERRIDE_OPTIONS): Improve
	documentation.
	(C_COMMON_OVERRIDE_OPTIONS): New.

Index: gcc/testsuite/ChangeLog
2006-02-24  Geoffrey Keating  <geoffk@apple.com>

	* g++.dg/eh/uncaught1.C: Add dg-options for ppc-darwin.
	* g++.dg/eh/uncaught2.C: New.
	* g++.dg/eh/uncaught3.C: New.

Index: gcc/cp/ChangeLog
2006-02-24  Geoffrey Keating  <geoffk@apple.com>

	* except.c (expand_start_catch_block): Handle
	flag_use_cxa_get_exception_ptr.

From-SVN: r111427

gcc/ChangeLog

@@ -1,3 +1,20 @@
+2006-02-24  Geoffrey Keating  <geoffk@apple.com>
+
+	* doc/tm.texi (Run-time Target): Document C_COMMON_OVERRIDE_OPTIONS.
+	* doc/invoke.texi (C++ Dialect Options): Document 
+	-fno-use-cxa-get-exception-ptr.
+	* configure.ac: Define DEFAULT_USE_CXA_ATEXIT to 2 not 1.
+	* configure: Regenerate.
+	* c.opt (fuse-cxa-get-exception-ptr): New.
+	* c-opts.c (c_common_handle_option): Handle
+	OPT_fuse_cxa_get_exception_ptr.
+	* c-common.c (flag_use_cxa_atexit): Update documentation.
+	(flag_use_cxa_get_exception_ptr): New.
+	* c-common.h (flag_use_cxa_get_exception_ptr): New.
+	* config/rs6000/darwin.h (SUBTARGET_OVERRIDE_OPTIONS): Improve
+	documentation.
+	(C_COMMON_OVERRIDE_OPTIONS): New.
+
 2006-02-24  Roger Sayle  <roger@eyesopen.com>
 
 	PR middle-end/24952

gcc/c-common.c

@@ -424,10 +424,16 @@ int flag_weak = 1;
 int flag_working_directory = -1;
 
 /* Nonzero to use __cxa_atexit, rather than atexit, to register
-   destructors for local statics and global objects.  */
+   destructors for local statics and global objects.  '2' means it has been
+   set nonzero as a default, not by a command-line flag.  */
 
 int flag_use_cxa_atexit = DEFAULT_USE_CXA_ATEXIT;
 
+/* Nonzero to use __cxa_get_exception_ptr in C++ exception-handling
+   code.  '2' means it has not been set explicitly on the command line.  */
+
+int flag_use_cxa_get_exception_ptr = 2;
+
 /* Nonzero means make the default pedwarns warnings instead of errors.
    The value of this flag is ignored if -pedantic is specified.  */
 

gcc/c-common.h

@@ -549,6 +549,11 @@ extern int flag_working_directory;
 
 extern int flag_use_cxa_atexit;
 
+/* Nonzero to use __cxa_get_exception_ptr in the C++ exception-handling
+   logic.  */
+
+extern int flag_use_cxa_get_exception_ptr;
+
 /* Nonzero means make the default pedwarns warnings instead of errors.
    The value of this flag is ignored if -pedantic is specified.  */
 

gcc/c-opts.c

@@ -786,6 +786,10 @@ c_common_handle_option (size_t scode, const char *arg, int value)
       flag_use_cxa_atexit = value;
       break;
       
+    case OPT_fuse_cxa_get_exception_ptr:
+      flag_use_cxa_get_exception_ptr = value;
+      break;
+      
     case OPT_fvisibility_inlines_hidden:
       visibility_options.inlines_hidden = value;
       break;
@@ -978,6 +982,12 @@ c_common_post_options (const char **pfilename)
   register_include_chains (parse_in, sysroot, iprefix, imultilib,
 			   std_inc, std_cxx_inc && c_dialect_cxx (), verbose);
 
+#ifdef C_COMMON_OVERRIDE_OPTIONS
+  /* Some machines may reject certain combinations of C
+     language-specific options.  */
+  C_COMMON_OVERRIDE_OPTIONS;
+#endif
+
   flag_inline_trees = 1;
 
   /* Use tree inlining.  */

gcc/c.opt

@@ -713,6 +713,10 @@ fuse-cxa-atexit
 C++ ObjC++
 Use __cxa_atexit to register destructors
 
+fuse-cxa-get-exception-ptr
+C++ ObjC++
+Use __cxa_get_exception_ptr in exception handling
+
 fvisibility-inlines-hidden
 C++ ObjC++
 Marks all inlined methods as having hidden visibility

gcc/config/rs6000/darwin.h

@@ -59,11 +59,10 @@
   while (0)
 
 
-/* The Darwin ABI always includes AltiVec, can't be (validly) turned
-   off.  */
-
 #define SUBTARGET_OVERRIDE_OPTIONS					\
 do {									\
+  /* The Darwin ABI always includes AltiVec, can't be (validly) turned	\
+     off.  */								\
   rs6000_altivec_abi = 1;						\
   TARGET_ALTIVEC_VRSAVE = 1;						\
   if (DEFAULT_ABI == ABI_DARWIN)					\
@@ -87,6 +86,21 @@ do {									\
     }									\
 } while(0)
 
+#define C_COMMON_OVERRIDE_OPTIONS do {					\
+  /* On powerpc, __cxa_get_exception_ptr is available starting in the	\
+     10.5 libstdc++.dylib.  */						\
+  if ((! darwin_macosx_version_min					\
+       || strverscmp (darwin_macosx_version_min, "10.5") < 0)		\
+      && flag_use_cxa_get_exception_ptr == 2)				\
+    flag_use_cxa_get_exception_ptr = 0;					\
+  /* On powerpc, __cxa_atexit is available starting in the 10.4		\
+     libSystem.dylib.  */						\
+  if ((! darwin_macosx_version_min					\
+       || strverscmp (darwin_macosx_version_min, "10.4") < 0)		\
+      && flag_use_cxa_atexit == 2)					\
+    flag_use_cxa_atexit = 0;						\
+} while (0)
+
 /* Darwin has 128-bit long double support in libc in 10.4 and later.
    Default to 128-bit long doubles even on earlier platforms for ABI
    consistency; arithmetic will work even if libc and libm support is

gcc/configure

@@ -12346,7 +12346,7 @@ fi
   if test x$use_cxa_atexit = xyes; then
 
 cat >>confdefs.h <<\_ACEOF
-#define DEFAULT_USE_CXA_ATEXIT 1
+#define DEFAULT_USE_CXA_ATEXIT 2
 _ACEOF
 
   fi

gcc/configure.ac

@@ -1392,7 +1392,7 @@ if test x$enable___cxa_atexit = xyes || \
     use_cxa_atexit=yes
   fi
   if test x$use_cxa_atexit = xyes; then
-    AC_DEFINE(DEFAULT_USE_CXA_ATEXIT, 1,
+    AC_DEFINE(DEFAULT_USE_CXA_ATEXIT, 2,
       [Define if you want to use __cxa_atexit, rather than atexit, to
       register C++ destructors for local statics and global objects.
       This is essential for fully standards-compliant handling of

gcc/cp/ChangeLog

@@ -1,3 +1,8 @@
+2006-02-24  Geoffrey Keating  <geoffk@apple.com>
+
+	* except.c (expand_start_catch_block): Handle
+	flag_use_cxa_get_exception_ptr.
+
 2006-02-22  Volker Reichelt  <reichelt@igpm.rwth-aachen.de>
 
 	PR c++/26291

gcc/cp/except.c

@@ -446,7 +446,8 @@ expand_start_catch_block (tree decl)
   /* If the C++ object needs constructing, we need to do that before
      calling __cxa_begin_catch, so that std::uncaught_exception gets
      the right value during the copy constructor.  */
-  else if (TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
+  else if (flag_use_cxa_get_exception_ptr 
+	   && TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
     {
       exp = do_get_exception_ptr ();
       initialize_handler_parm (decl, exp);

gcc/doc/invoke.texi

@@ -1581,6 +1581,12 @@ This option is required for fully standards-compliant handling of static
 destructors, but will only work if your C library supports
 @code{__cxa_atexit}.
 
+@item -fno-use-cxa-get-exception-ptr
+@opindex fno-use-cxa-get-exception-ptr
+Don't use the @code{__cxa_get_exception_ptr} runtime routine.  This
+will cause @code{std::uncaught_exception} to be incorrect, but is necessary
+if the runtime routine is not available.
+
 @item -fvisibility-inlines-hidden
 @opindex fvisibility-inlines-hidden
 Causes all inlined methods to be marked with

gcc/doc/tm.texi

@@ -778,6 +778,13 @@ Don't use this macro to turn on various extra optimizations for
 @option{-O}.  That is what @code{OPTIMIZATION_OPTIONS} is for.
 @end defmac
 
+@defmac C_COMMON_OVERRIDE_OPTIONS
+This is similar to @code{OVERRIDE_OPTIONS} but is only used in the C
+language frontends (C, Objective-C, C++, Objective-C++) and so can be
+used to alter option flag variables which only exist in those
+frontends.
+@end defmac
+
 @defmac OPTIMIZATION_OPTIONS (@var{level}, @var{size})
 Some machines may desire to change what optimizations are performed for
 various optimization levels.   This macro, if defined, is executed once

gcc/testsuite/ChangeLog

@@ -1,3 +1,9 @@
+2006-02-24  Geoffrey Keating  <geoffk@apple.com>
+
+	* g++.dg/eh/uncaught1.C: Add dg-options for ppc-darwin.
+	* g++.dg/eh/uncaught2.C: New.
+	* g++.dg/eh/uncaught3.C: New.
+
 2006-02-24  Jerry DeLisle  <jvdelisle@gcc.gnu.org>
 
 	PR libgfortran/26423

gcc/testsuite/g++.dg/eh/uncaught1.C

@@ -1,5 +1,6 @@
 // PR libstdc++/10606
 // { dg-do run }
+// { dg-options "-fuse-cxa-get-exception-ptr" { target powerpc*-*-darwin* } }
 
 #include <exception>
 #include <cstdlib>

gcc/testsuite/g++.dg/eh/uncaught2.C

@@ -0,0 +1,84 @@
+// { dg-do compile }
+// { dg-final { scan-assembler-not "__cxa_get_exception" } }
+// { dg-options "-fno-use-cxa-get-exception-ptr" }
+
+#include <exception>
+#include <cstdlib>
+
+
+struct Check {
+  int obj1, obj2;
+  bool state;
+};
+
+static Check const data[] = {
+  { 0, 0, false },	// construct [0]
+  { 1, 0, true  },	// [1] = [0]
+  { 0, 0, true  },	// destruct [0]
+  { 2, 1, true  },	// [2] = [1]
+  { 2, 2, true  },      // destruct [2]
+  { 3, 1, true  },	// [3] = [1]
+  { 3, 3, false },	// destruct [3]
+  { 1, 1, false },	// destruct [1]
+  { 9, 9, false }	// end-of-data
+};
+
+static int pos = 0;
+
+static void test(int obj1, int obj2, bool state)
+{
+  if (obj1 != data[pos].obj1) abort ();
+  if (obj2 != data[pos].obj2) abort ();
+  if (state != data[pos].state) abort ();
+  pos++;
+}
+
+
+struct S {
+  int id;
+  S ();
+  S (const S &);
+  ~S ();
+};
+
+static int next_id = 0;
+
+S::S()
+  : id (next_id++)
+{
+  test (id, id, std::uncaught_exception ());
+}
+
+S::S(const S &x)
+  : id (next_id++)
+{
+  test (id, x.id, std::uncaught_exception ());
+}
+
+S::~S()
+{
+  test (id, id, std::uncaught_exception ());
+}
+
+extern void foo (S *);
+
+int main()
+{
+  try
+    {
+      try
+	{
+	  S s0;
+	  throw s0;	// s1 is the exception object
+	}
+      catch (S s2)
+	{
+	  throw;
+	}
+    }
+  catch (S s3)
+    {
+    }
+ 
+  return 0;
+}

gcc/testsuite/g++.dg/eh/uncaught3.C

@@ -0,0 +1,84 @@
+// { dg-do compile { target powerpc*-*-darwin* } }
+// { dg-final { scan-assembler-not "__cxa_get_exception" } }
+// { dg-options "-mmacosx-version-min=10.4" }
+
+#include <exception>
+#include <cstdlib>
+
+
+struct Check {
+  int obj1, obj2;
+  bool state;
+};
+
+static Check const data[] = {
+  { 0, 0, false },	// construct [0]
+  { 1, 0, true  },	// [1] = [0]
+  { 0, 0, true  },	// destruct [0]
+  { 2, 1, true  },	// [2] = [1]
+  { 2, 2, true  },      // destruct [2]
+  { 3, 1, true  },	// [3] = [1]
+  { 3, 3, false },	// destruct [3]
+  { 1, 1, false },	// destruct [1]
+  { 9, 9, false }	// end-of-data
+};
+
+static int pos = 0;
+
+static void test(int obj1, int obj2, bool state)
+{
+  if (obj1 != data[pos].obj1) abort ();
+  if (obj2 != data[pos].obj2) abort ();
+  if (state != data[pos].state) abort ();
+  pos++;
+}
+
+
+struct S {
+  int id;
+  S ();
+  S (const S &);
+  ~S ();
+};
+
+static int next_id = 0;
+
+S::S()
+  : id (next_id++)
+{
+  test (id, id, std::uncaught_exception ());
+}
+
+S::S(const S &x)
+  : id (next_id++)
+{
+  test (id, x.id, std::uncaught_exception ());
+}
+
+S::~S()
+{
+  test (id, id, std::uncaught_exception ());
+}
+
+extern void foo (S *);
+
+int main()
+{
+  try
+    {
+      try
+	{
+	  S s0;
+	  throw s0;	// s1 is the exception object
+	}
+      catch (S s2)
+	{
+	  throw;
+	}
+    }
+  catch (S s3)
+    {
+    }
+ 
+  return 0;
+}