Imported Upstream version 0.9.6upstream/0.9.6

1 files changed, 176 insertions, 98 deletions

diff --git a/gnulib-m4/signbit.m4 b/gnulib-m4/signbit.m4
index 56ff825f..21b9bf5e 100644
--- a/gnulib-m4/signbit.m4
+++ b/gnulib-m4/signbit.m4
@@ -1,5 +1,5 @@
-# signbit.m4 serial 6
-dnl Copyright (C) 2007-2010 Free Software Foundation, Inc.
+# signbit.m4 serial 13
+dnl Copyright (C) 2007-2015 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.
@@ -7,9 +7,11 @@ dnl with or without modifications, as long as this notice is preserved.
 AC_DEFUN([gl_SIGNBIT],
 [
   AC_REQUIRE([gl_MATH_H_DEFAULTS])
+  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
   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.
@@ -23,8 +25,16 @@ 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="guessing no"])
+])],
+        [gl_cv_func_signbit=yes],
+        [gl_cv_func_signbit=no],
+        [case "$host_os" in
+                   # Guess yes on glibc systems.
+           *-gnu*) gl_cv_func_signbit="guessing yes" ;;
+                   # If we don't know, assume the worst.
+           *)      gl_cv_func_signbit="guessing no" ;;
+         esac
+        ])
     ])
   dnl GCC 4.0 and newer provides three built-ins for signbit.
   dnl They can be used without warnings, also in C++, regardless of <math.h>.
@@ -32,7 +42,8 @@ AC_DEFUN([gl_SIGNBIT],
   dnl libc.
   AC_CACHE_CHECK([for signbit compiler built-ins], [gl_cv_func_signbit_gcc],
     [
-      AC_TRY_RUN([
+      AC_RUN_IFELSE(
+        [AC_LANG_SOURCE([[
 #if __GNUC__ >= 4
 # define signbit(x) \
    (sizeof (x) == sizeof (long double) ? __builtin_signbitl (x) : \
@@ -43,84 +54,102 @@ AC_DEFUN([gl_SIGNBIT],
 #endif
 #include <string.h>
 ]gl_SIGNBIT_TEST_PROGRAM
-, [gl_cv_func_signbit_gcc=yes], [gl_cv_func_signbit_gcc=no],
-        [gl_cv_func_signbit_gcc="guessing no"])
+])],
+        [gl_cv_func_signbit_gcc=yes],
+        [gl_cv_func_signbit_gcc=no],
+        [case "$host_os" in
+                   # Guess yes on glibc systems.
+           *-gnu*) gl_cv_func_signbit_gcc="guessing yes" ;;
+                   # If we don't know, assume the worst.
+           *)      gl_cv_func_signbit_gcc="guessing no" ;;
+         esac
+        ])
     ])
   dnl Use the compiler built-ins whenever possible, because they are more
   dnl efficient than the system library functions (if they exist).
-  if test "$gl_cv_func_signbit_gcc" = yes; then
-    REPLACE_SIGNBIT_USING_GCC=1
-  else
-    if test "$gl_cv_func_signbit" != yes; then
-      REPLACE_SIGNBIT=1
-      AC_LIBOBJ([signbitf])
-      AC_LIBOBJ([signbitd])
-      AC_LIBOBJ([signbitl])
-      gl_FLOAT_SIGN_LOCATION
-      gl_DOUBLE_SIGN_LOCATION
-      gl_LONG_DOUBLE_SIGN_LOCATION
-      if test "$gl_cv_cc_float_signbit" = unknown; then
-        dnl Test whether copysignf() is declared.
-        AC_CHECK_DECLS([copysignf], , , [#include <math.h>])
-        if test "$ac_cv_have_decl_copysignf" = yes; then
-          dnl Test whether copysignf() can be used without libm.
-          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;],
-                [gl_cv_func_copysignf_no_libm=yes],
-                [gl_cv_func_copysignf_no_libm=no])
-            ])
-          if test $gl_cv_func_copysignf_no_libm = yes; then
-            AC_DEFINE([HAVE_COPYSIGNF_IN_LIBC], [1],
-              [Define if the copysignf function is declared in <math.h> and available in libc.])
+  case "$gl_cv_func_signbit_gcc" in
+    *yes)
+      REPLACE_SIGNBIT_USING_GCC=1
+      ;;
+    *)
+      case "$gl_cv_func_signbit" in
+        *yes) ;;
+        *)
+          dnl REPLACE_SIGNBIT=1 makes sure the signbit[fdl] functions get built.
+          REPLACE_SIGNBIT=1
+          gl_FLOAT_SIGN_LOCATION
+          gl_DOUBLE_SIGN_LOCATION
+          gl_LONG_DOUBLE_SIGN_LOCATION
+          if test "$gl_cv_cc_float_signbit" = unknown; then
+            dnl Test whether copysignf() is declared.
+            AC_CHECK_DECLS([copysignf], , , [[#include <math.h>]])
+            if test "$ac_cv_have_decl_copysignf" = yes; then
+              dnl Test whether copysignf() can be used without libm.
+              AC_CACHE_CHECK([whether copysignf can be used without linking with libm],
+                [gl_cv_func_copysignf_no_libm],
+                [
+                  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 $gl_cv_func_copysignf_no_libm = yes; then
+                AC_DEFINE([HAVE_COPYSIGNF_IN_LIBC], [1],
+                  [Define if the copysignf function is declared in <math.h> and available in libc.])
+              fi
+            fi
           fi
-        fi
-      fi
-      if test "$gl_cv_cc_double_signbit" = unknown; then
-        dnl Test whether copysign() is declared.
-        AC_CHECK_DECLS([copysign], , , [#include <math.h>])
-        if test "$ac_cv_have_decl_copysign" = yes; then
-          dnl Test whether copysign() can be used without libm.
-          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;],
-                [gl_cv_func_copysign_no_libm=yes],
-                [gl_cv_func_copysign_no_libm=no])
-            ])
-          if test $gl_cv_func_copysign_no_libm = yes; then
-            AC_DEFINE([HAVE_COPYSIGN_IN_LIBC], [1],
-              [Define if the copysign function is declared in <math.h> and available in libc.])
+          if test "$gl_cv_cc_double_signbit" = unknown; then
+            dnl Test whether copysign() is declared.
+            AC_CHECK_DECLS([copysign], , , [[#include <math.h>]])
+            if test "$ac_cv_have_decl_copysign" = yes; then
+              dnl Test whether copysign() can be used without libm.
+              AC_CACHE_CHECK([whether copysign can be used without linking with libm],
+                [gl_cv_func_copysign_no_libm],
+                [
+                  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 $gl_cv_func_copysign_no_libm = yes; then
+                AC_DEFINE([HAVE_COPYSIGN_IN_LIBC], [1],
+                  [Define if the copysign function is declared in <math.h> and available in libc.])
+              fi
+            fi
           fi
-        fi
-      fi
-      if test "$gl_cv_cc_long_double_signbit" = unknown; then
-        dnl Test whether copysignl() is declared.
-        AC_CHECK_DECLS([copysignl], , , [#include <math.h>])
-        if test "$ac_cv_have_decl_copysignl" = yes; then
-          dnl Test whether copysignl() can be used without libm.
-          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;],
-                [gl_cv_func_copysignl_no_libm=yes],
-                [gl_cv_func_copysignl_no_libm=no])
-            ])
-          if test $gl_cv_func_copysignl_no_libm = yes; then
-            AC_DEFINE([HAVE_COPYSIGNL_IN_LIBC], [1],
-              [Define if the copysignl function is declared in <math.h> and available in libc.])
+          if test "$gl_cv_cc_long_double_signbit" = unknown; then
+            dnl Test whether copysignl() is declared.
+            AC_CHECK_DECLS([copysignl], , , [[#include <math.h>]])
+            if test "$ac_cv_have_decl_copysignl" = yes; then
+              dnl Test whether copysignl() can be used without libm.
+              AC_CACHE_CHECK([whether copysignl can be used without linking with libm],
+                [gl_cv_func_copysignl_no_libm],
+                [
+                  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],
+                  [Define if the copysignl function is declared in <math.h> and available in libc.])
+              fi
+            fi
           fi
-        fi
-      fi
-    fi
-  fi
+          ;;
+      esac
+      ;;
+  esac
 ])
 
 AC_DEFUN([gl_SIGNBIT_TEST_PROGRAM], [[
@@ -141,14 +170,15 @@ double m0d = -p0d;
 /* On HP-UX 10.20, negating 0.0L does not yield -0.0L.
    So we use another constant expression instead.
    But that expression does not work on other platforms, such as when
-   cross-compiling to PowerPC on MacOS X 10.5.  */
+   cross-compiling to PowerPC on Mac OS X 10.5.  */
 long double p0l = 0.0L;
 #if defined __hpux || defined __sgi
 long double m0l = -LDBL_MIN * LDBL_MIN;
 #else
 long double m0l = -p0l;
 #endif
-  if (signbit (vf))
+  int result = 0;
+  if (signbit (vf)) /* link check */
     vf++;
   {
     float plus_inf = 1.0f / p0f;
@@ -159,9 +189,9 @@ long double m0l = -p0l;
           && (memcmp (&m0f, &p0f, sizeof (float)) == 0 || signbit (m0f))
           && !signbit (plus_inf)
           && signbit (minus_inf)))
-      return 1;
+      result |= 1;
   }
-  if (signbit (vd))
+  if (signbit (vd)) /* link check */
     vd++;
   {
     double plus_inf = 1.0 / p0d;
@@ -172,22 +202,27 @@ long double m0l = -p0l;
           && (memcmp (&m0d, &p0d, sizeof (double)) == 0 || signbit (m0d))
           && !signbit (plus_inf)
           && signbit (minus_inf)))
-      return 1;
+      result |= 2;
   }
-  if (signbit (vl))
+  if (signbit (vl)) /* link check */
     vl++;
   {
     long double plus_inf = 1.0L / p0l;
     long double minus_inf = -1.0L / p0l;
-    if (!(!signbit (255.0L)
-          && signbit (-255.0L)
-          && !signbit (p0l)
-          && (memcmp (&m0l, &p0l, sizeof (long double)) == 0 || signbit (m0l))
-          && !signbit (plus_inf)
-          && signbit (minus_inf)))
-      return 1;
+    if (signbit (255.0L))
+      result |= 4;
+    if (!signbit (-255.0L))
+      result |= 4;
+    if (signbit (p0l))
+      result |= 8;
+    if (!(memcmp (&m0l, &p0l, sizeof (long double)) == 0 || signbit (m0l)))
+      result |= 16;
+    if (signbit (plus_inf))
+      result |= 32;
+    if (!signbit (minus_inf))
+      result |= 64;
   }
-  return 0;
+  return result;
 }
 ]])
 
@@ -211,7 +246,8 @@ 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 \
@@ -236,7 +272,7 @@ int main ()
         {
           /* More than one bit difference.  */
           fprintf (fp, "unknown");
-          return 1;
+          return 2;
         }
       if (x)
         {
@@ -248,7 +284,7 @@ int main ()
     {
       /* No difference.  */
       fprintf (fp, "unknown");
-      return 1;
+      return 3;
     }
   /* Now m = plus.word[k] ^ ~minus.word[k].  */
   if (plus.word[k] & ~minus.word[k])
@@ -256,15 +292,17 @@ int main ()
       /* Oh? The sign bit is set in the positive and cleared in the negative
          numbers?  */
       fprintf (fp, "unknown");
-      return 1;
+      return 4;
     }
   for (i = 0; ; i++)
     if ((m >> i) & 1)
       break;
   fprintf (fp, "word %d bit %d", (int) k, (int) i);
-  return (fclose (fp) != 0);
+  if (fclose (fp) != 0)
+    return 5;
+  return 0;
 }
-        ],
+        ]])],
         [$2=`cat conftest.out`],
         [$2="unknown"],
         [
@@ -285,3 +323,43 @@ int main ()
       ;;
   esac
 ])
+
+# Expands to code that defines a function signbitf(float).
+# It extracts the sign bit of a non-NaN value.
+AC_DEFUN([gl_FLOAT_SIGNBIT_CODE],
+[
+  gl_FLOATTYPE_SIGNBIT_CODE([float], [f], [f])
+])
+
+# Expands to code that defines a function signbitd(double).
+# It extracts the sign bit of a non-NaN value.
+AC_DEFUN([gl_DOUBLE_SIGNBIT_CODE],
+[
+  gl_FLOATTYPE_SIGNBIT_CODE([double], [d], [])
+])
+
+# Expands to code that defines a function signbitl(long double).
+# It extracts the sign bit of a non-NaN value.
+AC_DEFUN([gl_LONG_DOUBLE_SIGNBIT_CODE],
+[
+  gl_FLOATTYPE_SIGNBIT_CODE([long double], [l], [L])
+])
+
+AC_DEFUN([gl_FLOATTYPE_SIGNBIT_CODE],
+[[
+static int
+signbit$2 ($1 value)
+{
+  typedef union { $1 f; unsigned char b[sizeof ($1)]; } float_union;
+  static float_union plus_one = { 1.0$3 };   /* unused bits are zero here */
+  static float_union minus_one = { -1.0$3 }; /* unused bits are zero here */
+  /* Compute the sign bit mask as the XOR of plus_one and minus_one.  */
+  float_union u;
+  unsigned int i;
+  u.f = value;
+  for (i = 0; i < sizeof ($1); i++)
+    if (u.b[i] & (plus_one.b[i] ^ minus_one.b[i]))
+      return 1;
+  return 0;
+}
+]])