re PR go/52358 (math FAILs on Solaris 8 and 9)

	PR go/52358
configure, runtime: Provide i386 long double math functions if needed.

From-SVN: r186915

libgo/config.h.in

@@ -3,12 +3,33 @@
 /* Define if building universal (internal helper macro) */
 #undef AC_APPLE_UNIVERSAL_BUILD
 
+/* Define to 1 if you have the `acosl' function. */
+#undef HAVE_ACOSL
+
+/* Define to 1 if you have the `asinl' function. */
+#undef HAVE_ASINL
+
+/* Define to 1 if you have the `atan2l' function. */
+#undef HAVE_ATAN2L
+
+/* Define to 1 if you have the `atanl' function. */
+#undef HAVE_ATANL
+
+/* Define to 1 if you have the `cosl' function. */
+#undef HAVE_COSL
+
 /* Define to 1 if you have the <dlfcn.h> header file. */
 #undef HAVE_DLFCN_H
 
 /* Define to 1 if you have the `epoll_create1' function. */
 #undef HAVE_EPOLL_CREATE1
 
+/* Define to 1 if you have the `expl' function. */
+#undef HAVE_EXPL
+
+/* Define to 1 if you have the `expm1l' function. */
+#undef HAVE_EXPM1L
+
 /* Define to 1 if you have the `faccessat' function. */
 #undef HAVE_FACCESSAT
 
@@ -42,6 +63,9 @@
 /* Define to 1 if you have the <inttypes.h> header file. */
 #undef HAVE_INTTYPES_H
 
+/* Define to 1 if you have the `ldexpl' function. */
+#undef HAVE_LDEXPL
+
 /* Define to 1 if you have the <linux/ether.h> header file. */
 #undef HAVE_LINUX_ETHER_H
 
@@ -72,6 +96,15 @@
 /* Define to 1 if the system has the type `loff_t'. */
 #undef HAVE_LOFF_T
 
+/* Define to 1 if you have the `log10l' function. */
+#undef HAVE_LOG10L
+
+/* Define to 1 if you have the `log1pl' function. */
+#undef HAVE_LOG1PL
+
+/* Define to 1 if you have the `logl' function. */
+#undef HAVE_LOGL
+
 /* Define to 1 if you have the `matherr' function. */
 #undef HAVE_MATHERR
 
@@ -126,6 +159,9 @@
 /* Define to 1 if you have the `setenv' function. */
 #undef HAVE_SETENV
 
+/* Define to 1 if you have the `sinl' function. */
+#undef HAVE_SINL
+
 /* Define to 1 if you have the `splice' function. */
 #undef HAVE_SPLICE
 
@@ -226,6 +262,9 @@
 /* Define to 1 if you have the <sys/vfs.h> header file. */
 #undef HAVE_SYS_VFS_H
 
+/* Define to 1 if you have the `tanl' function. */
+#undef HAVE_TANL
+
 /* Define to 1 if you have the `tee' function. */
 #undef HAVE_TEE
 

libgo/configure

@@ -14649,6 +14649,23 @@ _ACEOF
 fi
 
 
+LIBS_hold="$LIBS"
+LIBS="$LIBS -lm"
+for ac_func in cosl expl logl sinl tanl acosl asinl atanl atan2l expm1l ldexpl log10l log1pl
+do :
+  as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
+ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"
+eval as_val=\$$as_ac_var
+   if test "x$as_val" = x""yes; then :
+  cat >>confdefs.h <<_ACEOF
+#define `$as_echo "HAVE_$ac_func" | $as_tr_cpp` 1
+_ACEOF
+
+fi
+done
+
+LIBS="$LIBS_hold"
+
 CFLAGS_hold="$CFLAGS"
 CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
 LIBS_hold="$LIBS"

libgo/configure.ac

@@ -489,6 +489,11 @@ AC_CHECK_FUNCS(epoll_create1 faccessat fallocate fchmodat fchownat futimesat ino
 AC_TYPE_OFF_T
 AC_CHECK_TYPES([loff_t])
 
+LIBS_hold="$LIBS"
+LIBS="$LIBS -lm"
+AC_CHECK_FUNCS(cosl expl logl sinl tanl acosl asinl atanl atan2l expm1l ldexpl log10l log1pl)
+LIBS="$LIBS_hold"
+
 CFLAGS_hold="$CFLAGS"
 CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
 LIBS_hold="$LIBS"

libgo/runtime/go-nosys.c

@@ -13,6 +13,7 @@
 
 #include <errno.h>
 #include <fcntl.h>
+#include <math.h>
 #include <stdint.h>
 #include <sys/types.h>
 #include <sys/stat.h>
@@ -239,3 +240,116 @@ unshare (int flags __attribute__ ((unused)))
   return -1;
 }
 #endif
+
+/* Long double math functions.  These are needed on old i386 systems
+   that don't have them in libm.  The compiler translates calls to
+   these functions on float64 to call an 80-bit floating point
+   function instead, because when optimizing that function can be
+   executed as an x87 instructure.  However, when not optimizing, this
+   translates into a call to the math function.  So on systems that
+   don't provide these functions, we provide a version that just calls
+   the float64 version.  */
+
+#ifndef HAVE_COSL
+long double
+cosl (long double a)
+{
+  return (long double) cos ((double) a);
+}
+#endif
+
+#ifndef HAVE_EXPL
+long double
+expl (long double a)
+{
+  return (long double) exp ((double) a);
+}
+#endif
+
+#ifndef HAVE_LOGL
+long double
+logl (long double a)
+{
+  return (long double) log ((double) a);
+}
+#endif
+
+#ifndef HAVE_SINL
+long double
+sinl (long double a)
+{
+  return (long double) sin ((double) a);
+}
+#endif
+
+#ifndef HAVE_TANL
+long double
+tanl (long double a)
+{
+  return (long double) tan ((double) a);
+}
+#endif
+
+#ifndef HAVE_ACOSL
+long double
+acosl (long double a)
+{
+  return (long double) acos ((double) a);
+}
+#endif
+
+#ifndef HAVE_ASINL
+long double
+asinl (long double a)
+{
+  return (long double) asin ((double) a);
+}
+#endif
+
+#ifndef HAVE_ATANL
+long double
+atanl (long double a)
+{
+  return (long double) atan ((double) a);
+}
+#endif
+
+#ifndef HAVE_ATAN2L
+long double
+atan2l (long double a, long double b)
+{
+  return (long double) atan2 ((double) a, (double) b);
+}
+#endif
+
+#ifndef HAVE_EXPM1L
+long double
+expm1l (long double a)
+{
+  return (long double) expm1 ((double) a);
+}
+#endif
+
+#ifndef HAVE_LDEXPL
+long double
+ldexpl (long double a, int exp)
+{
+  return (long double) ldexp ((double) a, exp);
+}
+#endif
+
+#ifndef HAVE_LOG10L
+long double
+log10l (long double a)
+{
+  return (long double) log10 ((double) a);
+}
+#endif
+
+#ifndef HAVE_LOG1PL
+long double
+log1pl (long double a)
+{
+  return (long double) log1p ((double) a);
+}
+#endif