Darwin: Fixes for darwin_libc_has_function.

Firstly, the checks for availability need not be run for any
currently supported Darwin version (or for any version of
Darwin on x86).  In fact, the only test that is needed that
differs from the default is for the availbaility of sincos.
Test that and then fall back to the default implementation.

Secondly, the funtion appears to be called from the Jit library
before the value of darwin_macosx_version_min has been set up -
at present we work around this by guarding the checks on having
a non-null pointer for darwin_macosx_version_min.

Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>
gcc/ChangeLog:

	* config/darwin.c (darwin_libc_has_function): Do not run
	the checks for x86 or modern Darwin.  Make sure that there
	is a value set for darwin_macosx_version_min before testing.

diff --git a/gcc/config/darwin.c b/gcc/config/darwin.c
index 667fda79a60083cdc2190d68e42a6eacab19ef02..781742fe46f8d5365c39f92929c4f43f8b53c14e 100644 (file)
--- a/gcc/config/darwin.c
+++ b/gcc/config/darwin.c
@@ -42,6 +42,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "explow.h"
 #include "expr.h"
 #include "langhooks.h"
+#include "targhooks.h"
 #include "toplev.h"
 #include "lto-section-names.h"
 #include "intl.h"
@@ -3661,19 +3662,22 @@ darwin_rename_builtins (void)
     }
 }
 
+/* Implementation for the TARGET_LIBC_HAS_FUNCTION hook.  */
+
 bool
 darwin_libc_has_function (enum function_class fn_class,
                          tree type ATTRIBUTE_UNUSED)
 {
-  if (fn_class == function_sincos)
+  if (fn_class == function_sincos && darwin_macosx_version_min)
     return (strverscmp (darwin_macosx_version_min, "10.9") >= 0);
-
+#if DARWIN_PPC && SUPPORT_DARWIN_LEGACY
   if (fn_class == function_c99_math_complex
       || fn_class == function_c99_misc)
     return (TARGET_64BIT
-           || strverscmp (darwin_macosx_version_min, "10.3") >= 0);
-
-  return true;
+           || (darwin_macosx_version_min &&
+               strverscmp (darwin_macosx_version_min, "10.3") >= 0));
+#endif
+  return default_libc_has_function (fn_class, type);
 }
 
 hashval_t