Put more information about failed tests into the test return codes.

* m4/c-stack.m4 (AC_SYS_XSI_STACK_OVERFLOW_HEURISTIC): Change test
program so that it returns an enumerated value (0, 1, 2, 3, 4, ...).
* m4/d-ino.m4 (gl_CHECK_TYPE_STRUCT_DIRENT_D_INO): Likewise.
* m4/getcwd-path-max.m4 (gl_FUNC_GETCWD_PATH_MAX): Likewise.
* m4/getcwd.m4 (gl_FUNC_GETCWD_NULL): Likewise.
* m4/getdelim.m4 (gl_FUNC_GETDELIM): Likewise.
* m4/getline.m4 (gl_FUNC_GETLINE): Likewise.
* m4/intdiv0.m4 (gt_INTDIV0): Likewise.
* m4/isapipe.m4 (gl_PREREQ_ISAPIPE): Likewise.
* m4/nanosleep.m4 (gl_FUNC_NANOSLEEP): Likewise.
* m4/posix_spawn.m4 (gl_POSIX_SPAWN_WORKS): Likewise.
* m4/putenv.m4 (gl_FUNC_PUTENV): Likewise.
* m4/sleep.m4 (gl_FUNC_SLEEP): Likewise.
* m4/stdint.m4 (gl_STDINT_H): Likewise.
* m4/calloc.m4 (_AC_FUNC_CALLOC_IF): Change test program so that it
returns a bit mask.
* m4/canonicalize.m4 (gl_FUNC_REALPATH_WORKS): Likewise.
* m4/chown.m4 (gl_FUNC_CHOWN_FOLLOWS_SYMLINK): Likewise.
* m4/dup2.m4 (gl_FUNC_DUP2): Likewise.
* m4/fcntl-o.m4 (gl_FCNTL_O_FLAGS): Likewise.
* m4/fnmatch.m4 (gl_FUNC_FNMATCH_POSIX): Likewise.
* m4/frexp.m4 (gl_FUNC_FREXP_WORKS): Likewise.
* m4/frexpl.m4 (gl_FUNC_FREXPL_WORKS): Likewise.
* m4/getopt.m4 (gl_GETOPT_CHECK_HEADERS): Likewise.
* m4/iconv.m4 (AM_ICONV_LINK): Likewise.
* m4/iconv_open.m4 (gl_FUNC_ICONV_OPEN_UTF): Likewise.
* m4/isfinite.m4 (gl_ISFINITEL_WORKS): Likewise.
* m4/isnanf.m4 (gl_ISNANF_WORKS): Likewise.
* m4/isnanl.m4 (gl_FUNC_ISNANL_WORKS): Likewise.
* m4/ldexpl.m4 (gl_FUNC_LDEXPL_WORKS): Likewise.
* m4/link.m4 (gl_FUNC_LINK): Likewise.
* m4/linkat.m4 (gl_FUNC_LINKAT): Likewise.
* m4/mbrlen.m4 (gl_MBRLEN_RETVAL): Likewise.
* m4/mbrtowc.m4 (gl_MBRTOWC_RETVAL): Likewise.
* m4/mbsrtowcs.m4 (gl_MBSRTOWCS_WORKS): Likewise.
* m4/memchr.m4 (gl_FUNC_MEMCHR): Likewise.
* m4/memmem.m4 (gl_FUNC_MEMMEM): Likewise.
* m4/mkfifo.m4 (gl_FUNC_MKFIFO): Likewise.
* m4/mkstemp.m4 (gl_FUNC_MKSTEMP): Likewise.
* m4/mktime.m4 (AC_FUNC_MKTIME): Likewise.
* m4/open.m4 (gl_FUNC_OPEN): Likewise.
* m4/poll.m4 (gl_FUNC_POLL): Likewise.
* m4/popen.m4 (gl_FUNC_POPEN): Likewise.
* m4/printf.m4 (gl_PRINTF_SIZES_C99, gl_PRINTF_LONG_DOUBLE,
gl_PRINTF_INFINITE, gl_PRINTF_INFINITE_LONG_DOUBLE,
gl_PRINTF_DIRECTIVE_A, gl_PRINTF_DIRECTIVE_F, gl_PRINTF_DIRECTIVE_LS,
gl_PRINTF_PRECISION): Likewise.
* m4/regex.m4 (gl_REGEX): Likewise.
* m4/rename.m4 (gl_FUNC_RENAME): Likewise.
* m4/rmdir.m4 (gl_FUNC_RMDIR): Likewise.
* m4/setenv.m4 (gl_FUNC_SETENV_SEPARATE): Likewise.
* m4/stat.m4 (gl_FUNC_STAT): Likewise.
* m4/stpncpy.m4 (gl_FUNC_STPNCPY): Likewise.
* m4/strcasestr.m4 (gl_FUNC_STRCASESTR): Likewise.
* m4/strerror_r.m4 (gl_FUNC_STRERROR_R): Likewise.
* m4/strsignal.m4 (gl_FUNC_STRSIGNAL): Likewise.
* m4/strstr.m4 (gl_FUNC_STRSTR): Likewise.
* m4/strtod.m4 (gl_FUNC_STRTOD): Likewise.
* m4/symlink.m4 (gl_FUNC_SYMLINK): Likewise.
* m4/tsearch.m4 (gl_FUNC_TSEARCH): Likewise.
* m4/ttyname_r.m4 (gl_FUNC_TTYNAME_R): Likewise.
* m4/unlink-busy.m4 (gl_FUNC_UNLINK_BUSY_TEXT): Likewise.
* m4/unlink.m4 (gl_FUNC_UNLINK): Likewise.
* m4/utimensat.m4 (gl_FUNC_UTIMENSAT): Likewise.
* m4/utimes.m4 (gl_FUNC_UTIMES): Likewise.
* m4/wcrtomb.m4 (gl_FUNC_WCRTOMB): Likewise.
* m4/wcwidth.m4 (gl_FUNC_WCWIDTH): Likewise.
* m4/signbit.m4 (gl_SIGNBIT_TEST_PROGRAM): Likewise.
(gl_FLOATTYPE_SIGN_LOCATION): Change test program so that it returns an
enumerated value.
* m4/acl.m4 (gl_ACL_GET_FILE): Use "if ... return 1; return 0;" style.

1 files changed, 26 insertions, 22 deletions

diff --git a/m4/isnanl.m4 b/m4/isnanl.m4
index de7eafb049..0f425a11db 100644
--- a/m4/isnanl.m4
+++ b/m4/isnanl.m4
@@ -1,4 +1,4 @@
-# isnanl.m4 serial 13
+# isnanl.m4 serial 14
 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,
@@ -151,22 +151,26 @@ static long double NaNl ()
 #endif
 int main ()
 {
-  memory_long_double m;
-  unsigned int i;
+  int result = 0;
 
   if (!isnanl (NaNl ()))
-    return 1;
+    result |= 1;
 
-  /* The isnanl function should be immune against changes in the sign bit and
-     in the mantissa bits.  The xor operation twiddles a bit that can only be
-     a sign bit or a mantissa bit (since the exponent never extends to
-     bit 31).  */
-  m.value = NaNl ();
-  m.word[NWORDS / 2] ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
-  for (i = 0; i < NWORDS; i++)
-    m.word[i] |= 1;
-  if (!isnanl (m.value))
-    return 1;
+  {
+    memory_long_double m;
+    unsigned int i;
+
+    /* The isnanl function should be immune against changes in the sign bit and
+       in the mantissa bits.  The xor operation twiddles a bit that can only be
+       a sign bit or a mantissa bit (since the exponent never extends to
+       bit 31).  */
+    m.value = NaNl ();
+    m.word[NWORDS / 2] ^= (unsigned int) 1 << (sizeof (unsigned int) * CHAR_BIT - 1);
+    for (i = 0; i < NWORDS; i++)
+      m.word[i] |= 1;
+    if (!isnanl (m.value))
+      result |= 1;
+  }
 
 #if ((defined __ia64 && LDBL_MANT_DIG == 64) || (defined __x86_64__ || defined __amd64__) || (defined __i386 || defined __i386__ || defined _I386 || defined _M_IX86 || defined _X86_))
 /* Representation of an 80-bit 'long double' as an initializer for a sequence
@@ -185,14 +189,14 @@ int main ()
     static memory_long_double x =
       { LDBL80_WORDS (0xFFFF, 0xC3333333, 0x00000000) };
     if (!isnanl (x.value))
-      return 1;
+      result |= 2;
   }
   {
     /* Signalling NaN.  */
     static memory_long_double x =
       { LDBL80_WORDS (0xFFFF, 0x83333333, 0x00000000) };
     if (!isnanl (x.value))
-      return 1;
+      result |= 2;
   }
   /* The isnanl function should recognize Pseudo-NaNs, Pseudo-Infinities,
      Pseudo-Zeroes, Unnormalized Numbers, and Pseudo-Denormals, as defined in
@@ -205,35 +209,35 @@ int main ()
     static memory_long_double x =
       { LDBL80_WORDS (0xFFFF, 0x40000001, 0x00000000) };
     if (!isnanl (x.value))
-      return 1;
+      result |= 4;
   }
   { /* Pseudo-Infinity.  */
     static memory_long_double x =
       { LDBL80_WORDS (0xFFFF, 0x00000000, 0x00000000) };
     if (!isnanl (x.value))
-      return 1;
+      result |= 8;
   }
   { /* Pseudo-Zero.  */
     static memory_long_double x =
       { LDBL80_WORDS (0x4004, 0x00000000, 0x00000000) };
     if (!isnanl (x.value))
-      return 1;
+      result |= 16;
   }
   { /* Unnormalized number.  */
     static memory_long_double x =
       { LDBL80_WORDS (0x4000, 0x63333333, 0x00000000) };
     if (!isnanl (x.value))
-      return 1;
+      result |= 32;
   }
   { /* Pseudo-Denormal.  */
     static memory_long_double x =
       { LDBL80_WORDS (0x0000, 0x83333333, 0x00000000) };
     if (!isnanl (x.value))
-      return 1;
+      result |= 64;
   }
 #endif
 
-  return 0;
+  return result;
 }]])],
         [gl_cv_func_isnanl_works=yes],
         [gl_cv_func_isnanl_works=no],