update copyright for 2014 year bump

[gnulib.git] / m4 / fmodl.m4

diff --git a/m4/fmodl.m4 b/m4/fmodl.m4
index d1399ad..e223ae6 100644 (file)
--- a/m4/fmodl.m4
+++ b/m4/fmodl.m4
@@ -1,5 +1,5 @@
-# fmodl.m4 serial 2
-dnl Copyright (C) 2011-2012 Free Software Foundation, Inc.
+# fmodl.m4 serial 5
+dnl Copyright (C) 2011-2014 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.
@@ -11,6 +11,9 @@ AC_DEFUN([gl_FUNC_FMODL],
   AC_REQUIRE([gl_LONG_DOUBLE_VS_DOUBLE])
   AC_REQUIRE([gl_FUNC_FMOD])
 
+  dnl Persuade glibc <math.h> to declare fmodl().
+  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
+
   dnl Test whether fmodl() is declared.
   dnl AIX 5.1 has fmodl() in libc but doesn't declare it in <math.h>, and the
   dnl function produces NaN results for finite values.
@@ -31,6 +34,7 @@ AC_DEFUN([gl_FUNC_FMODL],
     fi
     m4_ifdef([gl_FUNC_FMODL_IEEE], [
       if test $gl_fmodl_required = ieee && test $REPLACE_FMODL = 0; then
+        AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
         AC_CACHE_CHECK([whether fmodl works according to ISO C 99 with IEC 60559],
           [gl_cv_func_fmodl_ieee],
           [
@@ -65,7 +69,13 @@ int main (int argc, char *argv[])
               ]])],
               [gl_cv_func_fmodl_ieee=yes],
               [gl_cv_func_fmodl_ieee=no],
-              [gl_cv_func_fmodl_ieee="guessing no"])
+              [case "$host_os" in
+                         # Guess yes on glibc systems.
+                 *-gnu*) gl_cv_func_fmodl_ieee="guessing yes" ;;
+                         # If we don't know, assume the worst.
+                 *)      gl_cv_func_fmodl_ieee="guessing no" ;;
+               esac
+              ])
             LIBS="$save_LIBS"
           ])
         case "$gl_cv_func_fmodl_ieee" in
@@ -82,18 +92,36 @@ int main (int argc, char *argv[])
     if test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1; then
       FMODL_LIBM="$FMOD_LIBM"
     else
+      AC_REQUIRE([gl_FUNC_FABSL])
+      AC_REQUIRE([gl_FUNC_FREXPL])
       AC_REQUIRE([gl_FUNC_TRUNCL])
-      AC_REQUIRE([gl_FUNC_FMAL])
+      AC_REQUIRE([gl_FUNC_LDEXPL])
+      AC_REQUIRE([gl_FUNC_ISNANL])
       FMODL_LIBM=
+      dnl Append $FABSL_LIBM to FMODL_LIBM, avoiding gratuitous duplicates.
+      case " $FMODL_LIBM " in
+        *" $FABSL_LIBM "*) ;;
+        *) FMODL_LIBM="$FMODL_LIBM $FABSL_LIBM" ;;
+      esac
+      dnl Append $FREXPL_LIBM to FMODL_LIBM, avoiding gratuitous duplicates.
+      case " $FMODL_LIBM " in
+        *" $FREXPL_LIBM "*) ;;
+        *) FMODL_LIBM="$FMODL_LIBM $FREXPL_LIBM" ;;
+      esac
       dnl Append $TRUNCL_LIBM to FMODL_LIBM, avoiding gratuitous duplicates.
       case " $FMODL_LIBM " in
         *" $TRUNCL_LIBM "*) ;;
         *) FMODL_LIBM="$FMODL_LIBM $TRUNCL_LIBM" ;;
       esac
-      dnl Append $FMAL_LIBM to FMODL_LIBM, avoiding gratuitous duplicates.
+      dnl Append $LDEXPL_LIBM to FMODL_LIBM, avoiding gratuitous duplicates.
+      case " $FMODL_LIBM " in
+        *" $LDEXPL_LIBM "*) ;;
+        *) FMODL_LIBM="$FMODL_LIBM $LDEXPL_LIBM" ;;
+      esac
+      dnl Append $ISNANL_LIBM to FMODL_LIBM, avoiding gratuitous duplicates.
       case " $FMODL_LIBM " in
-        *" $FMAL_LIBM "*) ;;
-        *) FMODL_LIBM="$FMODL_LIBM $FMAL_LIBM" ;;
+        *" $ISNANL_LIBM "*) ;;
+        *) FMODL_LIBM="$FMODL_LIBM $ISNANL_LIBM" ;;
       esac
     fi
   fi