init.sh: correct an outdated comment

[pspp] / m4 / signbit.m4

diff --git a/m4/signbit.m4 b/m4/signbit.m4
index e9c1e37f3fed01281b12446818fac11b63924a06..1751253944ebce2042079c2f8d421051cf6a08cc 100644 (file)
--- a/m4/signbit.m4
+++ b/m4/signbit.m4
@@ -1,5 +1,5 @@
-# signbit.m4 serial 4
-dnl Copyright (C) 2007-2008 Free Software Foundation, Inc.
+# signbit.m4 serial 7
+dnl Copyright (C) 2007-2010 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.
@@ -9,7 +9,8 @@ AC_DEFUN([gl_SIGNBIT],
   AC_REQUIRE([gl_MATH_H_DEFAULTS])
   AC_CACHE_CHECK([for signbit macro], [gl_cv_func_signbit],
     [
-      AC_TRY_RUN([
+      AC_RUN_IFELSE(
+        [AC_LANG_SOURCE([[
 #include <math.h>
 /* If signbit is defined as a function, don't use it, since calling it for
    'float' or 'long double' arguments would involve conversions.
@@ -23,7 +24,9 @@ AC_DEFUN([gl_SIGNBIT],
 #endif
 #include <string.h>
 ]gl_SIGNBIT_TEST_PROGRAM
-, [gl_cv_func_signbit=yes], [gl_cv_func_signbit=no],
+])],
+        [gl_cv_func_signbit=yes],
+        [gl_cv_func_signbit=no],
         [gl_cv_func_signbit="guessing no"])
     ])
   dnl GCC 4.0 and newer provides three built-ins for signbit.
@@ -32,7 +35,8 @@ AC_DEFUN([gl_SIGNBIT],
   dnl libc.
   AC_CACHE_CHECK([for signbit compiler built-ins], [gl_cv_func_signbit_gcc],
     [
-      AC_TRY_RUN([
+      AC_RUN_IFELSE(
+        [AC_LANG_SOURCE([[
 #if __GNUC__ >= 4
 # define signbit(x) \
    (sizeof (x) == sizeof (long double) ? __builtin_signbitl (x) : \
@@ -43,7 +47,9 @@ AC_DEFUN([gl_SIGNBIT],
 #endif
 #include <string.h>
 ]gl_SIGNBIT_TEST_PROGRAM
-, [gl_cv_func_signbit_gcc=yes], [gl_cv_func_signbit_gcc=no],
+])],
+        [gl_cv_func_signbit_gcc=yes],
+        [gl_cv_func_signbit_gcc=no],
         [gl_cv_func_signbit_gcc="guessing no"])
     ])
   dnl Use the compiler built-ins whenever possible, because they are more
@@ -67,14 +73,16 @@ AC_DEFUN([gl_SIGNBIT],
           AC_CACHE_CHECK([whether copysignf can be used without linking with libm],
             [gl_cv_func_copysignf_no_libm],
             [
-              AC_TRY_LINK([#include <math.h>
-                           float x, y;],
-                          [return copysignf (x, y) < 0;],
+              AC_LINK_IFELSE(
+                [AC_LANG_PROGRAM(
+                   [[#include <math.h>
+                     float x, y;]],
+                   [[return copysignf (x, y) < 0;]])],
                 [gl_cv_func_copysignf_no_libm=yes],
                 [gl_cv_func_copysignf_no_libm=no])
             ])
           if test $gl_cv_func_copysignf_no_libm = yes; then
-            AC_DEFINE([HAVE_COPYSIGNF_IN_LIBC], 1,
+            AC_DEFINE([HAVE_COPYSIGNF_IN_LIBC], [1],
               [Define if the copysignf function is declared in <math.h> and available in libc.])
           fi
         fi
@@ -87,14 +95,16 @@ AC_DEFUN([gl_SIGNBIT],
           AC_CACHE_CHECK([whether copysign can be used without linking with libm],
             [gl_cv_func_copysign_no_libm],
             [
-              AC_TRY_LINK([#include <math.h>
-                           double x, y;],
-                          [return copysign (x, y) < 0;],
+              AC_LINK_IFELSE(
+                [AC_LANG_PROGRAM(
+                   [[#include <math.h>
+                     double x, y;]],
+                   [[return copysign (x, y) < 0;]])],
                 [gl_cv_func_copysign_no_libm=yes],
                 [gl_cv_func_copysign_no_libm=no])
             ])
           if test $gl_cv_func_copysign_no_libm = yes; then
-            AC_DEFINE([HAVE_COPYSIGN_IN_LIBC], 1,
+            AC_DEFINE([HAVE_COPYSIGN_IN_LIBC], [1],
               [Define if the copysign function is declared in <math.h> and available in libc.])
           fi
         fi
@@ -107,14 +117,16 @@ AC_DEFUN([gl_SIGNBIT],
           AC_CACHE_CHECK([whether copysignl can be used without linking with libm],
             [gl_cv_func_copysignl_no_libm],
             [
-              AC_TRY_LINK([#include <math.h>
-                           long double x, y;],
-                          [return copysignl (x, y) < 0;],
+              AC_LINK_IFELSE(
+                [AC_LANG_PROGRAM(
+                   [[#include <math.h>
+                     long double x, y;]],
+                   [[return copysignl (x, y) < 0;]])],
                 [gl_cv_func_copysignl_no_libm=yes],
                 [gl_cv_func_copysignl_no_libm=no])
             ])
           if test $gl_cv_func_copysignl_no_libm = yes; then
-            AC_DEFINE([HAVE_COPYSIGNL_IN_LIBC], 1,
+            AC_DEFINE([HAVE_COPYSIGNL_IN_LIBC], [1],
               [Define if the copysignl function is declared in <math.h> and available in libc.])
           fi
         fi
@@ -124,6 +136,12 @@ AC_DEFUN([gl_SIGNBIT],
 ])
 
 AC_DEFUN([gl_SIGNBIT_TEST_PROGRAM], [[
+/* Global variables.
+   Needed because GCC 4 constant-folds __builtin_signbitl (literal)
+   but cannot constant-fold            __builtin_signbitl (variable).  */
+float vf;
+double vd;
+long double vl;
 int main ()
 {
 /* HP cc on HP-UX 10.20 has a bug with the constant expression -0.0.
@@ -142,6 +160,8 @@ long double m0l = -LDBL_MIN * LDBL_MIN;
 #else
 long double m0l = -p0l;
 #endif
+  if (signbit (vf))
+    vf++;
   {
     float plus_inf = 1.0f / p0f;
     float minus_inf = -1.0f / p0f;
@@ -153,6 +173,8 @@ long double m0l = -p0l;
           && signbit (minus_inf)))
       return 1;
   }
+  if (signbit (vd))
+    vd++;
   {
     double plus_inf = 1.0 / p0d;
     double minus_inf = -1.0 / p0d;
@@ -164,6 +186,8 @@ long double m0l = -p0l;
           && signbit (minus_inf)))
       return 1;
   }
+  if (signbit (vl))
+    vl++;
   {
     long double plus_inf = 1.0L / p0l;
     long double minus_inf = -1.0L / p0l;
@@ -199,7 +223,8 @@ AC_DEFUN([gl_FLOATTYPE_SIGN_LOCATION],
   AC_CACHE_CHECK([where to find the sign bit in a '$1'],
     [$2],
     [
-      AC_TRY_RUN([
+      AC_RUN_IFELSE(
+        [AC_LANG_SOURCE([[
 #include <stddef.h>
 #include <stdio.h>
 #define NWORDS \
@@ -252,7 +277,7 @@ int main ()
   fprintf (fp, "word %d bit %d", (int) k, (int) i);
   return (fclose (fp) != 0);
 }
-        ],
+        ]])],
         [$2=`cat conftest.out`],
         [$2="unknown"],
         [