darwin.h (SUBTARGET_OPTIONS): Add -mmacosx= option.

	* config/darwin.h (SUBTARGET_OPTIONS): Add -mmacosx= option.
	(macosx_version_min_required): Declare global variable.
	* config/darwin-protos.h (darwin_parse_macosx_version_name): Declare.
	* config/darwin.c (macosx_version_min_required): Define variable.
	(darwin_macosx_vers_tbl): Define. Table mapping text strings of
	OS versions to numerical codes.
	(darwin_parse_macosx_version_name): Define.  Parse -mmacosx=,
	set macosx_version_min_required appropriately.
	* config/i386/darwin.h (SUBTARGET_OVERRIDE_OPTIONS): Define.
	Invoke darwin_parse_macosx_version_name.
	* config/rs6000/darwin.h (SUBTARGET_OVERRIDE_OPTIONS): Add
	darwin_parse_macosx_version_name to Darwin option handling.
	* doc/invoke.texi (-mmacosx=): Document.

From-SVN: r78329

gcc/ChangeLog

+2003-02-23  Matt Austern  <austern@apple.com >
+
+	* config/darwin.h (SUBTARGET_OPTIONS): Add -mmacosx= option.
+	(macosx_version_min_required): Declare global variable.
+	* config/darwin-protos.h (darwin_parse_macosx_version_name): Declare.
+	* config/darwin.c (macosx_version_min_required): Define variable.
+	(darwin_macosx_vers_tbl): Define. Table mapping text strings of
+	OS versions to numerical codes.
+	(darwin_parse_macosx_version_name): Define.  Parse -mmacosx=,
+	set macosx_version_min_required appropriately.
+	* config/i386/darwin.h (SUBTARGET_OVERRIDE_OPTIONS): Define.
+	Invoke darwin_parse_macosx_version_name.
+	* config/rs6000/darwin.h (SUBTARGET_OVERRIDE_OPTIONS): Add
+	darwin_parse_macosx_version_name to Darwin option handling.
+	* doc/invoke.texi (-mmacosx=): Document.
+	
 2004-02-23  Dale Johannesen  <dalej@apple.com>
 
 	* config/rs6000.md (movsf_hardfloat): Add POWER form of nop.

gcc/config/darwin-protos.h

@@ -18,6 +18,8 @@ along with GCC; see the file COPYING.  If not, write to
 the Free Software Foundation, 59 Temple Place - Suite 330,
 Boston, MA 02111-1307, USA.  */
 
+extern void darwin_parse_macosx_version_name (void);
+
 extern int name_needs_quotes (const char *);
 
 extern void machopic_validate_stub_or_non_lazy_ptr (const char *, int);

gcc/config/darwin.c

@@ -48,6 +48,48 @@ static void update_non_lazy_ptrs (const char *);
 static void update_stubs (const char *);
 static const char *machopic_non_lazy_ptr_name (const char*);
 
+/* Earliest operating system for which generated code is targeted, as string
+   and as integer.  The string form is "10.0", "10.1", etc.  The corresponding
+   numeric versions are 1000, 1010, etc.  This number is used for feature 
+   tests of the form "enable_this_feature = macosx_version_min_required >= n",
+   so 0 is a conservative default. */
+
+const char *darwin_macosx_version_name;
+unsigned int macosx_version_min_required = 0;
+
+/* Parse -macosx= option. */
+
+static struct darwin_macosx_vers {
+  const char *vers_str;
+  unsigned int vers_num;
+} darwin_macosx_vers_tbl[] = {
+  { "10.0", 1000 },
+  { "10.1", 1010 },
+  { "10.2", 1020 },
+  { "jaguar", 1020 },
+  { "10.3", 1030 },
+  { "panther", 1030 },
+  { "10.4", 1040 },
+  { "10.5", 1050 },
+  { NULL, 0 }
+};  
+
+void darwin_parse_macosx_version_name (void)
+{
+  if (darwin_macosx_version_name)
+    {
+      struct darwin_macosx_vers *v = darwin_macosx_vers_tbl;
+      while (v->vers_str
+	     && strcmp (darwin_macosx_version_name, v->vers_str) != 0)
+	v++;
+
+      if (v->vers_str)
+	macosx_version_min_required = v->vers_num;
+      else
+	warning ("-macosx=%s: unrecognized version", darwin_macosx_version_name);
+    }
+}
+
 int
 name_needs_quotes (const char *name)
 {

gcc/config/darwin.h

@@ -82,6 +82,19 @@ Boston, MA 02111-1307, USA.  */
 #undef	DEFAULT_PCC_STRUCT_RETURN
 #define DEFAULT_PCC_STRUCT_RETURN 0
 
+/* Strings provided by SUBTARGET_OPTIONS */
+extern const char *darwin_macosx_version_name;
+
+/* Override rs6000.h/i386.h definition */
+#undef SUBTARGET_OPTIONS
+#define SUBTARGET_OPTIONS					            \
+  { "macosx=", &darwin_macosx_version_name,		    \
+      N_("Earliest operating system for which code should be generated"), 0 }
+
+/* Earliest operating system for which generated code is targeted. 1000 for 10.0,
+   1010 for 10.1, etc. */
+extern unsigned int macosx_version_min_required;
+
 /* This table intercepts weirdo options whose names would interfere
    with normal driver conventions, and either translates them into
    standardly-named options, or adds a 'Z' so that they can get to

gcc/config/i386/darwin.h

@@ -51,6 +51,11 @@ Boston, MA 02111-1307, USA.  */
 #define SUBTARGET_EXTRA_SPECS			\
   { "darwin_arch", "i386" },
 
+#define SUBTARGET_OVERRIDE_OPTIONS				  	\
+do {									\
+  darwin_parse_macosx_version_name ();                                  \
+} while (0)
+
 /* Use the following macro for any Darwin/x86-specific command-line option
    translation.  */
 #define SUBTARGET_OPTION_TRANSLATE_TABLE

gcc/config/rs6000/darwin.h

@@ -87,7 +87,8 @@ do {									\
         flag_pic = 2;							\
       }									\
   }									\
-}while(0)
+  darwin_parse_macosx_version_name ();                                  \
+} while (0)
 
 /* We want -fPIC by default, unless we're using -static to compile for
    the kernel or some such.  */

gcc/doc/invoke.texi

@@ -462,7 +462,7 @@ in the following sections.
 -single_module  -static  -sub_library  -sub_umbrella @gol
 -twolevel_namespace  -umbrella  -undefined @gol
 -unexported_symbols_list  -weak_reference_mismatches @gol
--whatsloaded}
+-whatsloaded -mmacosx=@var{ver}}
 
 @emph{MIPS Options}
 @gccoptlist{-EL  -EB  -march=@var{arch}  -mtune=@var{arch} @gol
@@ -7590,6 +7590,13 @@ See man ld(1) for more information.
 This specifies the @var{executable} that will be loading the build
 output file being linked. See man ld(1) for more information.
 
+@item -mmacosx=@var{ver}
+@opindex mmacosx
+This specifies the earliest version of Mac OS for which code should
+be generated.  Specifying @code{-mmacosx=10.2}, for example, allows
+the compiler to use features that were first made available in that
+version of the operating system.
+
 @item -allowable_client  @var{client_name}
 @itemx -arch_only