asinl: Simplify for platforms where 'long double' == 'double'.

[gnulib.git] / m4 / asinl.m4

diff --git a/m4/asinl.m4 b/m4/asinl.m4
index 2df2663..cef97a2 100644 (file)
--- a/m4/asinl.m4
+++ b/m4/asinl.m4
@@ -1,4 +1,4 @@
-# asinl.m4 serial 5
+# asinl.m4 serial 6
 dnl Copyright (C) 2010-2011 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -7,6 +7,8 @@ dnl with or without modifications, as long as this notice is preserved.
 AC_DEFUN([gl_FUNC_ASINL],
 [
   AC_REQUIRE([gl_MATH_H_DEFAULTS])
+  AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
+
   dnl Persuade glibc <math.h> to declare asinl().
   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
 
@@ -56,12 +58,17 @@ AC_DEFUN([gl_FUNC_ASINL],
     HAVE_DECL_ASINL=0
     HAVE_ASINL=0
     dnl Find libraries needed to link lib/asinl.c.
-    AC_REQUIRE([gl_FUNC_SQRTL])
-    dnl Append $SQRTL_LIBM to ASINL_LIBM, avoiding gratuitous duplicates.
-    case " $ASINL_LIBM " in
-      *" $SQRTL_LIBM "*) ;;
-      *) ASINL_LIBM="$ASINL_LIBM $SQRTL_LIBM" ;;
-    esac
+    if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
+      AC_REQUIRE([gl_FUNC_ASIN])
+      ASINL_LIBM="$ASIN_LIBM"
+    else
+      AC_REQUIRE([gl_FUNC_SQRTL])
+      dnl Append $SQRTL_LIBM to ASINL_LIBM, avoiding gratuitous duplicates.
+      case " $ASINL_LIBM " in
+        *" $SQRTL_LIBM "*) ;;
+        *) ASINL_LIBM="$ASINL_LIBM $SQRTL_LIBM" ;;
+      esac
+    fi
   fi
   AC_SUBST([ASINL_LIBM])
 ])