libm: fix C99_MATH on __NO_LONG_DOUBLE_MATH hosts

alias l to their normal double counterparts.
Works around problems with libgcc blindly calling __finitel on e.g. ppc32

Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

libm/Makefile.in

@@ -129,11 +129,6 @@ FL_MOBJ := \
 
 # Not implemented [yet?]: nexttowardl.o
 LD_MOBJ := \
-	__finitel.o \
-	__fpclassifyl.o \
-	__isinfl.o \
-	__isnanl.o \
-	__signbitl.o \
 	acoshl.o \
 	acosl.o \
 	asinhl.o \

libm/ldouble_wrappers.c

@@ -116,16 +116,6 @@ long long func##l(long double x) \
 }
 #endif /* __i386__ && __OPTIMIZE__ */
 
-#if defined __NO_LONG_DOUBLE_MATH
-# define int_WRAPPER_C99(func) /* not needed */
-# else
-# define int_WRAPPER_C99(func) \
-int func##l(long double x) \
-{ \
-    return func((double) x); \
-} \
-libm_hidden_def(func##l)
-#endif
 
 /* Implement the following, as defined by SuSv3 */
 #if 0
@@ -501,32 +491,3 @@ long double significandl(long double x)
 	return (long double) significand((double) x);
 }
 #endif
-
-#ifdef __DO_C99_MATH__
-
-#ifdef L___fpclassifyl
-int_WRAPPER1(__fpclassify)
-libm_hidden_def(__fpclassifyl)
-#endif
-
-#ifdef L___finitel
-int_WRAPPER1(__finite)
-libm_hidden_def(__finitel)
-#endif
-
-#ifdef L___signbitl
-int_WRAPPER1(__signbit)
-libm_hidden_def(__signbitl)
-#endif
-
-#ifdef L___isnanl
-int_WRAPPER1(__isnan)
-libm_hidden_def(__isnanl)
-#endif
-
-#ifdef L___isinfl
-int_WRAPPER1(__isinf)
-libm_hidden_def(__isinfl)
-#endif
-
-#endif

libm/math_private.h

@@ -255,5 +255,18 @@ extern int    __kernel_rem_pio2 (double*,double*,int,int,int,const int*) attribu
 #define math_force_eval(x)  do { __typeof(x) __x = (x); __asm __volatile ("" : : "m" (__x)); } while (0)
 #endif
 
+/* If we do not have long double support, then alias to the double variant.  */
+#if defined __NO_LONG_DOUBLE_MATH
+# define int_WRAPPER_C99(func) \
+weak_alias(func,func##l)
+# else
+# define int_WRAPPER_C99(func) \
+int func##l(long double x) \
+{ \
+    return func((double) x); \
+} \
+libm_hidden_def(func##l)
+#endif
+
 
 #endif /* _MATH_PRIVATE_H_ */

libm/s_finite.c

@@ -30,3 +30,6 @@ int __finite(double x)
 	return (hx | 0x800fffff) != 0xffffffff;
 }
 libm_hidden_def(__finite)
+#if defined __DO_C99_MATH__
+int_WRAPPER_C99(__finite)
+#endif

libm/s_fpclassify.c

@@ -40,3 +40,6 @@ int __fpclassify(double x)
   return retval;
 }
 libm_hidden_def(__fpclassify)
+#if defined __DO_C99_MATH__
+int_WRAPPER_C99(__fpclassify)
+#endif

libm/s_isinf.c

@@ -21,3 +21,6 @@ int __isinf(double x)
 	return ~(lx >> 31) & (hx >> 30);
 }
 libm_hidden_def(__isinf)
+#if defined __DO_C99_MATH__
+int_WRAPPER_C99(__isinf)
+#endif

libm/s_isnan.c

@@ -27,3 +27,6 @@ int __isnan(double x)
 	return (int)(((u_int32_t)hx)>>31);
 }
 libm_hidden_def(__isnan)
+#if defined __DO_C99_MATH__
+int_WRAPPER_C99(__isnan)
+#endif

libm/s_signbit.c

@@ -33,3 +33,6 @@ __signbit (double x)
   return hx & 0x80000000;
 }
 libm_hidden_def(__signbit)
+#if defined __DO_C99_MATH__
+int_WRAPPER_C99(__signbit)
+#endif