Support for MSVC compiler: Avoid division by a literal 0.

* lib/math.in.h (NAN): Define through a function call also on MSVC.
* m4/frexp.m4 (gl_FUNC_FREXP_WORKS): Divide by 'zero' instead of 0.0.
* m4/printf.m4 (gl_PRINTF_INFINITE, gl_PRINTF_DIRECTIVE_A,
gl_PRINTF_DIRECTIVE_F, gl_PRINTF_FLAG_ZERO): Likewise.
(gl_PRINTF_INFINITE_LONG_DOUBLE): Divide by 'zeroL' instead of 0.0L.
* tests/infinity.h: New file.
* tests/nan.h (NaNf, NaNd, NaNl): Define through a function call also
on MSVC.
* tests/test-ceilf1.c: Include infinity.h.
(main): Use Infinityf.
* tests/test-ceil1.c: Include infinity.h.
(main): Use Infinityd.
* tests/test-ceill.c: Include infinity.h.
(main): Use Infinityl.
* tests/test-dprintf-posix.c: Include infinity.h.
(test_function): Use Infinityd.
* tests/test-floorf1.c: Include infinity.h.
(main): Use Infinityf.
* tests/test-floor1.c: Include infinity.h.
(main): Use Infinityd.
* tests/test-floorl.c: Include infinity.h.
(main): Use Infinityl.
* tests/test-fprintf-posix.c: Include infinity.h.
(test_function): Use Infinityd.
* tests/test-frexp.c: Include infinity.h.
(main): Use Infinityd.
* tests/test-frexpl.c: Include infinity.h.
(main): Use Infinityl.
* tests/test-isfinite.c: Include infinity.h.
(test_isfinitef): Use Infinityf.
(test_isfinited): Use Infinityd.
(test_isfinitel): Use Infinityl.
* tests/test-isinf.c: Include infinity.h.
(test_isinff): Use Infinityf.
(test_isinfd): Use Infinityd.
(test_isinfl): Use Infinityl.
* tests/test-isnan.c: Include infinity.h.
(test_float): Use Infinityf.
(test_double): Use Infinityd.
(test_long_double): Use Infinityl.
* tests/test-isnanf.h: Include infinity.h.
(main): Use Infinityf.
* tests/test-isnand.h: Include infinity.h.
(main): Use Infinityd.
* tests/test-isnanl.h: Include infinity.h.
(main): Use Infinityl.
* tests/test-ldexpl.c: Include infinity.h.
(main): Use Infinityl.
* tests/test-printf-posix.h: Include infinity.h.
(test_function): Use Infinityd.
* tests/test-roundf1.c: Include infinity.h.
(main): Use Infinityf.
* tests/test-round1.c: Include infinity.h.
(main): Use Infinityd.
* tests/test-roundl.c: Include infinity.h.
(main): Use Infinityl.
* tests/test-signbit.c: Include infinity.h.
(test_signbitf): Use Infinityf.
(test_signbitd): Use Infinityd.
(test_signbitl): Use Infinityl.
* tests/test-snprintf-posix.h: Include infinity.h.
(test_function): Use Infinityd, Infinityl.
* tests/test-sprintf-posix.h: Include infinity.h.
(test_function): Use Infinityd, Infinityl.
* tests/test-truncf1.c: Include infinity.h.
(main): Use Infinityf.
* tests/test-trunc1.c: Include infinity.h.
(main): Use Infinityd.
* tests/test-truncl.c: Include infinity.h.
(main): Use Infinityl.
* tests/test-vasnprintf-posix.c: Include infinity.h.
(test_function): Use Infinityd, Infinityl.
* tests/test-vasprintf-posix.c: Include infinity.h.
(test_function): Use Infinityd, Infinityl.
* modules/ceilf-tests (Files): Add tests/infinity.h.
* modules/ceil-tests (Files): Likewise.
* modules/ceill-tests (Files): Likewise.
* modules/dprintf-posix-tests (Files): Likewise.
* modules/floorf-tests (Files): Likewise.
* modules/floor-tests (Files): Likewise.
* modules/floorl-tests (Files): Likewise.
* modules/fprintf-posix-tests (Files): Likewise.
* modules/frexp-tests (Files): Likewise.
* modules/frexp-nolibm-tests (Files): Likewise.
* modules/frexpl-tests (Files): Likewise.
* modules/frexpl-nolibm-tests (Files): Likewise.
* modules/isfinite-tests (Files): Likewise.
* modules/isinf-tests (Files): Likewise.
* modules/isnan-tests (Files): Likewise.
* modules/isnanf-tests (Files): Likewise.
* modules/isnanf-nolibm-tests (Files): Likewise.
* modules/isnand-tests (Files): Likewise.
* modules/isnand-nolibm-tests (Files): Likewise.
* modules/isnanl-tests (Files): Likewise.
* modules/isnanl-nolibm-tests (Files): Likewise.
* modules/ldexpl-tests (Files): Likewise.
* modules/printf-posix-tests (Files): Likewise.
* modules/roundf-tests (Files): Likewise.
* modules/round-tests (Files): Likewise.
* modules/roundl-tests (Files): Likewise.
* modules/signbit-tests (Files): Likewise.
* modules/snprintf-posix-tests (Files): Likewise.
* modules/sprintf-posix-tests (Files): Likewise.
* modules/truncf-tests (Files): Likewise.
* modules/trunc-tests (Files): Likewise.
* modules/truncl-tests (Files): Likewise.
* modules/vasnprintf-posix-tests (Files): Likewise.
* modules/vasprintf-posix-tests (Files): Likewise.
* modules/vdprintf-posix-tests (Files): Likewise.
* modules/vfprintf-posix-tests (Files): Likewise.
* modules/vprintf-posix-tests (Files): Likewise.
* modules/vsnprintf-posix-tests (Files): Likewise.
* modules/vsprintf-posix-tests (Files): Likewise.
* modules/xprintf-posix-tests (Files): Likewise.

2 files changed, 21 insertions, 18 deletions

diff --git a/m4/frexp.m4 b/m4/frexp.m4
index 125edcdc45..f2048f3be3 100644
--- a/m4/frexp.m4
+++ b/m4/frexp.m4
@@ -1,4 +1,4 @@
-# frexp.m4 serial 11
+# frexp.m4 serial 12
 dnl Copyright (C) 2007-2011 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -133,7 +133,7 @@ int main()
         result |= 1;
     }
   /* Test on infinite numbers.  */
-  x = 1.0 / 0.0;
+  x = 1.0 / zero;
   {
     int exp;
     double y = frexp (x, &exp);
diff --git a/m4/printf.m4 b/m4/printf.m4
index 0531ad5f2e..d046c11123 100644
--- a/m4/printf.m4
+++ b/m4/printf.m4
@@ -1,4 +1,4 @@
-# printf.m4 serial 44
+# printf.m4 serial 45
 dnl Copyright (C) 2003, 2007-2011 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -178,28 +178,28 @@ static double zero = 0.0;
 int main ()
 {
   int result = 0;
-  if (sprintf (buf, "%f", 1.0 / 0.0) < 0
+  if (sprintf (buf, "%f", 1.0 / zero) < 0
       || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
     result |= 1;
-  if (sprintf (buf, "%f", -1.0 / 0.0) < 0
+  if (sprintf (buf, "%f", -1.0 / zero) < 0
       || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
     result |= 1;
   if (sprintf (buf, "%f", zero / zero) < 0
       || !strisnan (buf, 0, strlen (buf)))
     result |= 2;
-  if (sprintf (buf, "%e", 1.0 / 0.0) < 0
+  if (sprintf (buf, "%e", 1.0 / zero) < 0
       || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
     result |= 4;
-  if (sprintf (buf, "%e", -1.0 / 0.0) < 0
+  if (sprintf (buf, "%e", -1.0 / zero) < 0
       || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
     result |= 4;
   if (sprintf (buf, "%e", zero / zero) < 0
       || !strisnan (buf, 0, strlen (buf)))
     result |= 8;
-  if (sprintf (buf, "%g", 1.0 / 0.0) < 0
+  if (sprintf (buf, "%g", 1.0 / zero) < 0
       || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
     result |= 16;
-  if (sprintf (buf, "%g", -1.0 / 0.0) < 0
+  if (sprintf (buf, "%g", -1.0 / zero) < 0
       || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
     result |= 16;
   if (sprintf (buf, "%g", zero / zero) < 0
@@ -294,28 +294,28 @@ int main ()
 {
   int result = 0;
   nocrash_init();
-  if (sprintf (buf, "%Lf", 1.0L / 0.0L) < 0
+  if (sprintf (buf, "%Lf", 1.0L / zeroL) < 0
       || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
     result |= 1;
-  if (sprintf (buf, "%Lf", -1.0L / 0.0L) < 0
+  if (sprintf (buf, "%Lf", -1.0L / zeroL) < 0
       || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
     result |= 1;
   if (sprintf (buf, "%Lf", zeroL / zeroL) < 0
       || !strisnan (buf, 0, strlen (buf)))
     result |= 1;
-  if (sprintf (buf, "%Le", 1.0L / 0.0L) < 0
+  if (sprintf (buf, "%Le", 1.0L / zeroL) < 0
       || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
     result |= 1;
-  if (sprintf (buf, "%Le", -1.0L / 0.0L) < 0
+  if (sprintf (buf, "%Le", -1.0L / zeroL) < 0
       || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
     result |= 1;
   if (sprintf (buf, "%Le", zeroL / zeroL) < 0
       || !strisnan (buf, 0, strlen (buf)))
     result |= 1;
-  if (sprintf (buf, "%Lg", 1.0L / 0.0L) < 0
+  if (sprintf (buf, "%Lg", 1.0L / zeroL) < 0
       || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
     result |= 1;
-  if (sprintf (buf, "%Lg", -1.0L / 0.0L) < 0
+  if (sprintf (buf, "%Lg", -1.0L / zeroL) < 0
       || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
     result |= 1;
   if (sprintf (buf, "%Lg", zeroL / zeroL) < 0
@@ -478,6 +478,7 @@ AC_DEFUN([gl_PRINTF_DIRECTIVE_A],
 #include <stdio.h>
 #include <string.h>
 static char buf[100];
+static double zero = 0.0;
 int main ()
 {
   int result = 0;
@@ -502,7 +503,7 @@ int main ()
     result |= 4;
   /* This catches a FreeBSD 6.1 bug.  See
      <http://lists.gnu.org/archive/html/bug-gnulib/2007-04/msg00107.html> */
-  if (sprintf (buf, "%010a %d", 1.0 / 0.0, 33, 44, 55) < 0
+  if (sprintf (buf, "%010a %d", 1.0 / zero, 33, 44, 55) < 0
       || buf[0] == '0')
     result |= 8;
   /* This catches a MacOS X 10.3.9 (Darwin 7.9) bug.  */
@@ -562,13 +563,14 @@ AC_DEFUN([gl_PRINTF_DIRECTIVE_F],
 #include <stdio.h>
 #include <string.h>
 static char buf[100];
+static double zero = 0.0;
 int main ()
 {
   int result = 0;
   if (sprintf (buf, "%F %d", 1234567.0, 33, 44, 55) < 0
       || strcmp (buf, "1234567.000000 33") != 0)
     result |= 1;
-  if (sprintf (buf, "%F", 1.0 / 0.0) < 0
+  if (sprintf (buf, "%F", 1.0 / zero) < 0
       || (strcmp (buf, "INF") != 0 && strcmp (buf, "INFINITY") != 0))
     result |= 2;
   /* This catches a Cygwin 1.5.x bug.  */
@@ -878,9 +880,10 @@ AC_DEFUN([gl_PRINTF_FLAG_ZERO],
 #include <stdio.h>
 #include <string.h>
 static char buf[100];
+static double zero = 0.0;
 int main ()
 {
-  if (sprintf (buf, "%010f", 1.0 / 0.0, 33, 44, 55) < 0
+  if (sprintf (buf, "%010f", 1.0 / zero, 33, 44, 55) < 0
       || (strcmp (buf, "       inf") != 0
           && strcmp (buf, "  infinity") != 0))
     return 1;