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-rw-r--r--math/math.h32
1 files changed, 31 insertions, 1 deletions
diff --git a/math/math.h b/math/math.h
index 326fd8ebe1..f6d1feed78 100644
--- a/math/math.h
+++ b/math/math.h
@@ -489,6 +489,14 @@ extern long double __REDIRECT_NTH (nexttowardl,
 extern int signgam;
 #endif
 
+#if (__HAVE_DISTINCT_FLOAT16			\
+     || __HAVE_DISTINCT_FLOAT32			\
+     || __HAVE_DISTINCT_FLOAT64			\
+     || __HAVE_DISTINCT_FLOAT32X		\
+     || __HAVE_DISTINCT_FLOAT64X		\
+     || __HAVE_DISTINCT_FLOAT128X)
+# error "Unsupported _FloatN or _FloatNx types for <math.h>."
+#endif
 
 /* Depending on the type of TG_ARG, call an appropriately suffixed
    version of FUNC with arguments (including parentheses) ARGS.
@@ -500,17 +508,39 @@ extern int signgam;
    return the same type (FUNC may include a cast if necessary rather
    than being a single identifier).  */
 #ifdef __NO_LONG_DOUBLE_MATH
+# if __HAVE_DISTINCT_FLOAT128
+#  error "Distinct _Float128 without distinct long double not supported."
+# endif
 # define __MATH_TG(TG_ARG, FUNC, ARGS)					\
   (sizeof (TG_ARG) == sizeof (float) ? FUNC ## f ARGS : FUNC ARGS)
 #elif __HAVE_DISTINCT_FLOAT128
 # if __HAVE_GENERIC_SELECTION
-#  define __MATH_TG(TG_ARG, FUNC, ARGS)		\
+#  if __HAVE_FLOATN_NOT_TYPEDEF && __HAVE_FLOAT32
+#   define __MATH_TG_F32(FUNC, ARGS) _Float32: FUNC ## f ARGS,
+#  else
+#   define __MATH_TG_F32(FUNC, ARGS)
+#  endif
+#  if __HAVE_FLOATN_NOT_TYPEDEF && __HAVE_FLOAT64X
+#   if __HAVE_FLOAT64X_LONG_DOUBLE
+#    define __MATH_TG_F64X(FUNC, ARGS) _Float64x: FUNC ## l ARGS,
+#   else
+#    define __MATH_TG_F64X(FUNC, ARGS) _Float64x: FUNC ## f128 ARGS,
+#   endif
+#  else
+#   define __MATH_TG_F64X(FUNC, ARGS)
+#  endif
+#  define __MATH_TG(TG_ARG, FUNC, ARGS)	\
      _Generic ((TG_ARG),			\
 	       float: FUNC ## f ARGS,		\
+	       __MATH_TG_F32 (FUNC, ARGS)	\
 	       default: FUNC ARGS,		\
 	       long double: FUNC ## l ARGS,	\
+	       __MATH_TG_F64X (FUNC, ARGS)	\
 	       _Float128: FUNC ## f128 ARGS)
 # else
+#  if __HAVE_FLOATN_NOT_TYPEDEF
+#   error "Non-typedef _FloatN but no _Generic."
+#  endif
 #  define __MATH_TG(TG_ARG, FUNC, ARGS)					\
      __builtin_choose_expr						\
      (__builtin_types_compatible_p (__typeof (TG_ARG), float),		\