4 files changed, 12 insertions, 0 deletions
diff --git a/gcc/config/i386/i386.h b/gcc/config/i386/i386.h
index add7a64..fe3735d 100644
--- a/gcc/config/i386/i386.h
+++ b/gcc/config/i386/i386.h
@@ -2666,6 +2666,9 @@ extern void debug_dispatch_window (int);
 
 #define TARGET_SUPPORTS_WIDE_INT 1
 
+/* Use custom descriptors instead of trampolines when possible.  */
+#define TARGET_CUSTOM_FUNCTION_DESCRIPTORS 1
+
 /*
 Local variables:
 version-control: t
diff --git a/gcc/config/ia64/ia64.h b/gcc/config/ia64/ia64.h
index ac0cb86..82971a4 100644
--- a/gcc/config/ia64/ia64.h
+++ b/gcc/config/ia64/ia64.h
@@ -1715,4 +1715,7 @@ struct GTY(()) machine_function
 /* Switch on code for querying unit reservations.  */
 #define CPU_UNITS_QUERY 1
 
+/* IA-64 already uses descriptors for its standard calling sequence.  */
+#define TARGET_CUSTOM_FUNCTION_DESCRIPTORS 0
+
 /* End of ia64.h */
diff --git a/gcc/config/rs6000/rs6000.h b/gcc/config/rs6000/rs6000.h
index f53da15..f1c338e 100644
--- a/gcc/config/rs6000/rs6000.h
+++ b/gcc/config/rs6000/rs6000.h
@@ -2922,6 +2922,9 @@ extern GTY(()) tree rs6000_builtin_decls[RS6000_BUILTIN_COUNT];
 
 #define TARGET_SUPPORTS_WIDE_INT 1
 
+/* Use custom descriptors instead of trampolines if not AIX or ELFv1.  */
+#define TARGET_CUSTOM_FUNCTION_DESCRIPTORS (DEFAULT_ABI != ABI_AIX)
+
 #if (GCC_VERSION >= 3000)
 #pragma GCC poison TARGET_FLOAT128 OPTION_MASK_FLOAT128 MASK_FLOAT128
 #endif
diff --git a/gcc/config/sparc/sparc.h b/gcc/config/sparc/sparc.h
index 5389216..108769f 100644
--- a/gcc/config/sparc/sparc.h
+++ b/gcc/config/sparc/sparc.h
@@ -1813,3 +1813,6 @@ extern int sparc_indent_opcode;
 #define SPARC_LOW_FE_EXCEPT_VALUES 0
 
 #define TARGET_SUPPORTS_WIDE_INT 1
+
+/* Use custom descriptors instead of trampolines when possible.  */
+#define TARGET_CUSTOM_FUNCTION_DESCRIPTORS 1