ceil-ieee tests: More tests.

[gnulib.git] / m4 / logl.m4

diff --git a/m4/logl.m4 b/m4/logl.m4
index 70a5ead..874f588 100644 (file)
--- a/m4/logl.m4
+++ b/m4/logl.m4
@@ -1,5 +1,5 @@
-# logl.m4 serial 5
-dnl Copyright (C) 2010-2011 Free Software Foundation, Inc.
+# logl.m4 serial 7
+dnl Copyright (C) 2010-2012 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
@@ -7,6 +7,8 @@ dnl with or without modifications, as long as this notice is preserved.
 AC_DEFUN([gl_FUNC_LOGL],
 [
   AC_REQUIRE([gl_MATH_H_DEFAULTS])
+  AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
+
   dnl Persuade glibc <math.h> to declare logl().
   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
 
@@ -20,8 +22,10 @@ AC_DEFUN([gl_FUNC_LOGL],
              # define __NO_MATH_INLINES 1 /* for glibc */
              #endif
              #include <math.h>
+             long double (*funcptr) (long double) = logl;
              long double x;]],
-           [[return logl (x) > 1;]])],
+           [[return funcptr (x) > 1
+                    || logl (x) > 1;]])],
         [gl_cv_func_logl_no_libm=yes],
         [gl_cv_func_logl_no_libm=no])
     ])
@@ -37,8 +41,10 @@ AC_DEFUN([gl_FUNC_LOGL],
                # define __NO_MATH_INLINES 1 /* for glibc */
                #endif
                #include <math.h>
+               long double (*funcptr) (long double) = logl;
                long double x;]],
-             [[return logl (x) > 1;]])],
+             [[return funcptr (x) > 1
+                      || logl (x) > 1;]])],
           [gl_cv_func_logl_in_libm=yes],
           [gl_cv_func_logl_in_libm=no])
         LIBS="$save_LIBS"
@@ -56,24 +62,29 @@ AC_DEFUN([gl_FUNC_LOGL],
     HAVE_DECL_LOGL=0
     HAVE_LOGL=0
     dnl Find libraries needed to link lib/logl.c.
-    AC_REQUIRE([gl_FUNC_FREXPL])
-    AC_REQUIRE([gl_FUNC_ISNANL])
-    AC_REQUIRE([gl_FUNC_FLOORL])
-    dnl Append $FREXPL_LIBM to LOGL_LIBM, avoiding gratuitous duplicates.
-    case " $LOGL_LIBM " in
-      *" $FREXPL_LIBM "*) ;;
-      *) LOGL_LIBM="$LOGL_LIBM $FREXPL_LIBM" ;;
-    esac
-    dnl Append $ISNANL_LIBM to LOGL_LIBM, avoiding gratuitous duplicates.
-    case " $LOGL_LIBM " in
-      *" $ISNANL_LIBM "*) ;;
-      *) LOGL_LIBM="$LOGL_LIBM $ISNANL_LIBM" ;;
-    esac
-    dnl Append $FLOORL_LIBM to LOGL_LIBM, avoiding gratuitous duplicates.
-    case " $LOGL_LIBM " in
-      *" $FLOORL_LIBM "*) ;;
-      *) LOGL_LIBM="$LOGL_LIBM $FLOORL_LIBM" ;;
-    esac
+    if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
+      AC_REQUIRE([gl_FUNC_LOG])
+      LOGL_LIBM="$LOG_LIBM"
+    else
+      AC_REQUIRE([gl_FUNC_FREXPL])
+      AC_REQUIRE([gl_FUNC_ISNANL])
+      AC_REQUIRE([gl_FUNC_FLOORL])
+      dnl Append $FREXPL_LIBM to LOGL_LIBM, avoiding gratuitous duplicates.
+      case " $LOGL_LIBM " in
+        *" $FREXPL_LIBM "*) ;;
+        *) LOGL_LIBM="$LOGL_LIBM $FREXPL_LIBM" ;;
+      esac
+      dnl Append $ISNANL_LIBM to LOGL_LIBM, avoiding gratuitous duplicates.
+      case " $LOGL_LIBM " in
+        *" $ISNANL_LIBM "*) ;;
+        *) LOGL_LIBM="$LOGL_LIBM $ISNANL_LIBM" ;;
+      esac
+      dnl Append $FLOORL_LIBM to LOGL_LIBM, avoiding gratuitous duplicates.
+      case " $LOGL_LIBM " in
+        *" $FLOORL_LIBM "*) ;;
+        *) LOGL_LIBM="$LOGL_LIBM $FLOORL_LIBM" ;;
+      esac
+    fi
   fi
   AC_SUBST([LOGL_LIBM])
 ])