Added test for copysign(), useful in Solaris <= 10, where signbit was not supported by the standard version of gcc.

src/CHANGELOG

@@ -69,6 +69,8 @@ ECL 9.9.1:
 
  - In Solaris 8 ECL failed because it did not find inttypes.h
 
+ - When signbit() is not available, ECL now looks for existence of copysign.
+
 ;;; Local Variables: ***
 ;;; mode:text ***
 ;;; fill-column:79 ***

src/configure

@@ -12660,8 +12660,10 @@ done
 
 
 
+
 for ac_func in expf logf sqrtf cosf sinf tanf sinhf coshf tanhf \
-		floorf ceilf fabsf frexpf ldexpf log1p log1pf log1pl
+		floorf ceilf fabsf frexpf ldexpf log1p log1pf log1pl \
+                copysign
 do
 as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
 { $as_echo "$as_me:$LINENO: checking for $ac_func" >&5

src/configure.in

@@ -637,7 +637,8 @@ AC_CHECK_FUNCS( [nanosleep alarm times select setenv putenv] \
 		[gettimeofday getrusage] )
 
 AC_CHECK_FUNCS( [expf logf sqrtf cosf sinf tanf sinhf coshf tanhf] \
-		[floorf ceilf fabsf frexpf ldexpf log1p log1pf log1pl])
+		[floorf ceilf fabsf frexpf ldexpf log1p log1pf log1pl] \
+                [copysign] )
 
 AC_CHECK_FUNCS( [sched_yield uname fseeko] )