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diff -Nur gcc-7.2.0.orig/gcc/config/m68k/m68k.c gcc-7.2.0/gcc/config/m68k/m68k.c
--- gcc-7.2.0.orig/gcc/config/m68k/m68k.c 2017-04-03 22:30:56.274463000 +0000
+++ gcc-7.2.0/gcc/config/m68k/m68k.c 2018-01-27 02:16:53.779367849 +0000
@@ -182,6 +182,8 @@
const_tree, bool);
static bool m68k_cannot_force_const_mem (machine_mode mode, rtx x);
static bool m68k_output_addr_const_extra (FILE *, rtx);
+static machine_mode m68k_promote_function_mode (const_tree, machine_mode,
+ int *, const_tree, int);
static void m68k_init_sync_libfuncs (void) ATTRIBUTE_UNUSED;
static enum flt_eval_method
m68k_excess_precision (enum excess_precision_type);
@@ -332,6 +334,9 @@
#undef TARGET_ATOMIC_TEST_AND_SET_TRUEVAL
#define TARGET_ATOMIC_TEST_AND_SET_TRUEVAL 128
+#undef TARGET_PROMOTE_FUNCTION_MODE
+#define TARGET_PROMOTE_FUNCTION_MODE m68k_promote_function_mode
+
static const struct attribute_spec m68k_attribute_table[] =
{
/* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler,
@@ -6571,4 +6576,20 @@
return FLT_EVAL_METHOD_UNPREDICTABLE;
}
+/* Implement TARGET_PROMOTE_FUNCTION_MODE. */
+
+static machine_mode
+m68k_promote_function_mode (const_tree type, machine_mode mode,
+ int *punsignedp ATTRIBUTE_UNUSED,
+ const_tree fntype ATTRIBUTE_UNUSED,
+ int for_return)
+{
+ /* Promote libcall arguments narrower than int to match the normal C
+ ABI (for which promotions are handled via
+ TARGET_PROMOTE_PROTOTYPES). */
+ if (type == NULL_TREE && !for_return && (mode == QImode || mode == HImode))
+ return SImode;
+ return mode;
+}
+
#include "gt-m68k.h"
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