2 dnl Copyright (C) 2003, 2007-2008 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved.
7 dnl Test whether the *printf family of functions supports the 'j', 'z', 't',
8 dnl 'L' size specifiers. (ISO C99, POSIX:2001)
9 dnl Result is gl_cv_func_printf_sizes_c99.
11 AC_DEFUN([gl_PRINTF_SIZES_C99],
13 AC_REQUIRE([AC_PROG_CC])
14 AC_REQUIRE([gl_AC_HEADER_STDINT_H])
15 AC_REQUIRE([gl_AC_HEADER_INTTYPES_H])
16 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
17 AC_CACHE_CHECK([whether printf supports size specifiers as in C99],
18 [gl_cv_func_printf_sizes_c99],
24 #include <sys/types.h>
25 #if HAVE_STDINT_H_WITH_UINTMAX
28 #if HAVE_INTTYPES_H_WITH_UINTMAX
29 # include <inttypes.h>
34 #if HAVE_STDINT_H_WITH_UINTMAX || HAVE_INTTYPES_H_WITH_UINTMAX
36 if (sprintf (buf, "%ju %d", (uintmax_t) 12345671, 33, 44, 55) < 0
37 || strcmp (buf, "12345671 33") != 0)
41 if (sprintf (buf, "%zu %d", (size_t) 12345672, 33, 44, 55) < 0
42 || strcmp (buf, "12345672 33") != 0)
45 if (sprintf (buf, "%tu %d", (ptrdiff_t) 12345673, 33, 44, 55) < 0
46 || strcmp (buf, "12345673 33") != 0)
49 if (sprintf (buf, "%Lg %d", (long double) 1.5, 33, 44, 55) < 0
50 || strcmp (buf, "1.5 33") != 0)
53 }], [gl_cv_func_printf_sizes_c99=yes], [gl_cv_func_printf_sizes_c99=no],
57 # Guess yes on glibc systems.
58 *-gnu*) gl_cv_func_printf_sizes_c99="guessing yes";;
59 # Guess yes on FreeBSD >= 5.
60 freebsd[1-4]*) gl_cv_func_printf_sizes_c99="guessing no";;
61 freebsd* | kfreebsd*) gl_cv_func_printf_sizes_c99="guessing yes";;
62 # Guess yes on MacOS X >= 10.3.
63 darwin[1-6].*) gl_cv_func_printf_sizes_c99="guessing no";;
64 darwin*) gl_cv_func_printf_sizes_c99="guessing yes";;
65 # Guess yes on OpenBSD >= 3.9.
66 openbsd[1-2].* | openbsd3.[0-8] | openbsd3.[0-8].*)
67 gl_cv_func_printf_sizes_c99="guessing no";;
68 openbsd*) gl_cv_func_printf_sizes_c99="guessing yes";;
69 # Guess yes on Solaris >= 2.10.
70 solaris2.[0-9]*) gl_cv_func_printf_sizes_c99="guessing no";;
71 solaris*) gl_cv_func_printf_sizes_c99="guessing yes";;
72 # Guess yes on NetBSD >= 3.
73 netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
74 gl_cv_func_printf_sizes_c99="guessing no";;
75 netbsd*) gl_cv_func_printf_sizes_c99="guessing yes";;
76 # If we don't know, assume the worst.
77 *) gl_cv_func_printf_sizes_c99="guessing no";;
84 dnl Test whether the *printf family of functions supports 'long double'
85 dnl arguments together with the 'L' size specifier. (ISO C99, POSIX:2001)
86 dnl Result is gl_cv_func_printf_long_double.
88 AC_DEFUN([gl_PRINTF_LONG_DOUBLE],
90 AC_REQUIRE([AC_PROG_CC])
91 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
92 AC_CACHE_CHECK([whether printf supports 'long double' arguments],
93 [gl_cv_func_printf_long_double],
98 static char buf[10000];
102 if (sprintf (buf, "%Lf %d", 1.75L, 33, 44, 55) < 0
103 || strcmp (buf, "1.750000 33") != 0)
106 if (sprintf (buf, "%Le %d", 1.75L, 33, 44, 55) < 0
107 || strcmp (buf, "1.750000e+00 33") != 0)
110 if (sprintf (buf, "%Lg %d", 1.75L, 33, 44, 55) < 0
111 || strcmp (buf, "1.75 33") != 0)
114 }], [gl_cv_func_printf_long_double=yes], [gl_cv_func_printf_long_double=no],
118 beos*) gl_cv_func_printf_long_double="guessing no";;
119 mingw* | pw*) gl_cv_func_printf_long_double="guessing no";;
120 *) gl_cv_func_printf_long_double="guessing yes";;
127 dnl Test whether the *printf family of functions supports infinite and NaN
128 dnl 'double' arguments in the %f, %e, %g directives. (ISO C99, POSIX:2001)
129 dnl Result is gl_cv_func_printf_infinite.
131 AC_DEFUN([gl_PRINTF_INFINITE],
133 AC_REQUIRE([AC_PROG_CC])
134 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
135 AC_CACHE_CHECK([whether printf supports infinite 'double' arguments],
136 [gl_cv_func_printf_infinite],
142 strisnan (const char *string, size_t start_index, size_t end_index)
144 if (start_index < end_index)
146 if (string[start_index] == '-')
148 if (start_index + 3 <= end_index
149 && memcmp (string + start_index, "nan", 3) == 0)
152 if (start_index == end_index
153 || (string[start_index] == '(' && string[end_index - 1] == ')'))
159 static char buf[10000];
160 static double zero = 0.0;
163 if (sprintf (buf, "%f", 1.0 / 0.0) < 0
164 || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
166 if (sprintf (buf, "%f", -1.0 / 0.0) < 0
167 || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
169 if (sprintf (buf, "%f", zero / zero) < 0
170 || !strisnan (buf, 0, strlen (buf)))
172 if (sprintf (buf, "%e", 1.0 / 0.0) < 0
173 || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
175 if (sprintf (buf, "%e", -1.0 / 0.0) < 0
176 || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
178 if (sprintf (buf, "%e", zero / zero) < 0
179 || !strisnan (buf, 0, strlen (buf)))
181 if (sprintf (buf, "%g", 1.0 / 0.0) < 0
182 || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
184 if (sprintf (buf, "%g", -1.0 / 0.0) < 0
185 || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
187 if (sprintf (buf, "%g", zero / zero) < 0
188 || !strisnan (buf, 0, strlen (buf)))
191 }], [gl_cv_func_printf_infinite=yes], [gl_cv_func_printf_infinite=no],
195 # Guess yes on glibc systems.
196 *-gnu*) gl_cv_func_printf_infinite="guessing yes";;
197 # Guess yes on FreeBSD >= 6.
198 freebsd[1-5]*) gl_cv_func_printf_infinite="guessing no";;
199 freebsd* | kfreebsd*) gl_cv_func_printf_infinite="guessing yes";;
200 # Guess yes on MacOS X >= 10.3.
201 darwin[1-6].*) gl_cv_func_printf_infinite="guessing no";;
202 darwin*) gl_cv_func_printf_infinite="guessing yes";;
203 # Guess yes on HP-UX >= 11.
204 hpux[7-9]* | hpux10*) gl_cv_func_printf_infinite="guessing no";;
205 hpux*) gl_cv_func_printf_infinite="guessing yes";;
206 # Guess yes on NetBSD >= 3.
207 netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
208 gl_cv_func_printf_infinite="guessing no";;
209 netbsd*) gl_cv_func_printf_infinite="guessing yes";;
211 beos*) gl_cv_func_printf_infinite="guessing yes";;
212 # If we don't know, assume the worst.
213 *) gl_cv_func_printf_infinite="guessing no";;
220 dnl Test whether the *printf family of functions supports infinite and NaN
221 dnl 'long double' arguments in the %f, %e, %g directives. (ISO C99, POSIX:2001)
222 dnl Result is gl_cv_func_printf_infinite_long_double.
224 AC_DEFUN([gl_PRINTF_INFINITE_LONG_DOUBLE],
226 AC_REQUIRE([gl_PRINTF_LONG_DOUBLE])
227 AC_REQUIRE([AC_PROG_CC])
228 AC_REQUIRE([AC_C_BIGENDIAN])
229 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
230 dnl The user can set or unset the variable gl_printf_safe to indicate
231 dnl that he wishes a safe handling of non-IEEE-754 'long double' values.
232 if test -n "$gl_printf_safe"; then
233 AC_DEFINE([CHECK_PRINTF_SAFE], 1,
234 [Define if you wish *printf() functions that have a safe handling of
235 non-IEEE-754 'long double' values.])
237 case "$gl_cv_func_printf_long_double" in
239 AC_CACHE_CHECK([whether printf supports infinite 'long double' arguments],
240 [gl_cv_func_printf_infinite_long_double],
248 strisnan (const char *string, size_t start_index, size_t end_index)
250 if (start_index < end_index)
252 if (string[start_index] == '-')
254 if (start_index + 3 <= end_index
255 && memcmp (string + start_index, "nan", 3) == 0)
258 if (start_index == end_index
259 || (string[start_index] == '(' && string[end_index - 1] == ')'))
265 static char buf[10000];
266 static long double zeroL = 0.0L;
270 if (sprintf (buf, "%Lf", 1.0L / 0.0L) < 0
271 || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
273 if (sprintf (buf, "%Lf", -1.0L / 0.0L) < 0
274 || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
276 if (sprintf (buf, "%Lf", zeroL / zeroL) < 0
277 || !strisnan (buf, 0, strlen (buf)))
279 if (sprintf (buf, "%Le", 1.0L / 0.0L) < 0
280 || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
282 if (sprintf (buf, "%Le", -1.0L / 0.0L) < 0
283 || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
285 if (sprintf (buf, "%Le", zeroL / zeroL) < 0
286 || !strisnan (buf, 0, strlen (buf)))
288 if (sprintf (buf, "%Lg", 1.0L / 0.0L) < 0
289 || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
291 if (sprintf (buf, "%Lg", -1.0L / 0.0L) < 0
292 || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
294 if (sprintf (buf, "%Lg", zeroL / zeroL) < 0
295 || !strisnan (buf, 0, strlen (buf)))
297 #if CHECK_PRINTF_SAFE && ((defined __ia64 && LDBL_MANT_DIG == 64) || (defined __x86_64__ || defined __amd64__) || (defined __i386 || defined __i386__ || defined _I386 || defined _M_IX86 || defined _X86_))
298 /* Representation of an 80-bit 'long double' as an initializer for a sequence
299 of 'unsigned int' words. */
300 # ifdef WORDS_BIGENDIAN
301 # define LDBL80_WORDS(exponent,manthi,mantlo) \
302 { ((unsigned int) (exponent) << 16) | ((unsigned int) (manthi) >> 16), \
303 ((unsigned int) (manthi) << 16) | (unsigned int) (mantlo) >> 16), \
304 (unsigned int) (mantlo) << 16 \
307 # define LDBL80_WORDS(exponent,manthi,mantlo) \
308 { mantlo, manthi, exponent }
311 static union { unsigned int word[4]; long double value; } x =
312 { LDBL80_WORDS (0xFFFF, 0xC3333333, 0x00000000) };
313 if (sprintf (buf, "%Lf", x.value) < 0
314 || !strisnan (buf, 0, strlen (buf)))
316 if (sprintf (buf, "%Le", x.value) < 0
317 || !strisnan (buf, 0, strlen (buf)))
319 if (sprintf (buf, "%Lg", x.value) < 0
320 || !strisnan (buf, 0, strlen (buf)))
324 /* Signalling NaN. */
325 static union { unsigned int word[4]; long double value; } x =
326 { LDBL80_WORDS (0xFFFF, 0x83333333, 0x00000000) };
327 if (sprintf (buf, "%Lf", x.value) < 0
328 || !strisnan (buf, 0, strlen (buf)))
330 if (sprintf (buf, "%Le", x.value) < 0
331 || !strisnan (buf, 0, strlen (buf)))
333 if (sprintf (buf, "%Lg", x.value) < 0
334 || !strisnan (buf, 0, strlen (buf)))
338 static union { unsigned int word[4]; long double value; } x =
339 { LDBL80_WORDS (0xFFFF, 0x40000001, 0x00000000) };
340 if (sprintf (buf, "%Lf", x.value) < 0
341 || !strisnan (buf, 0, strlen (buf)))
343 if (sprintf (buf, "%Le", x.value) < 0
344 || !strisnan (buf, 0, strlen (buf)))
346 if (sprintf (buf, "%Lg", x.value) < 0
347 || !strisnan (buf, 0, strlen (buf)))
350 { /* Pseudo-Infinity. */
351 static union { unsigned int word[4]; long double value; } x =
352 { LDBL80_WORDS (0xFFFF, 0x00000000, 0x00000000) };
353 if (sprintf (buf, "%Lf", x.value) < 0
354 || !strisnan (buf, 0, strlen (buf)))
356 if (sprintf (buf, "%Le", x.value) < 0
357 || !strisnan (buf, 0, strlen (buf)))
359 if (sprintf (buf, "%Lg", x.value) < 0
360 || !strisnan (buf, 0, strlen (buf)))
364 static union { unsigned int word[4]; long double value; } x =
365 { LDBL80_WORDS (0x4004, 0x00000000, 0x00000000) };
366 if (sprintf (buf, "%Lf", x.value) < 0
367 || !strisnan (buf, 0, strlen (buf)))
369 if (sprintf (buf, "%Le", x.value) < 0
370 || !strisnan (buf, 0, strlen (buf)))
372 if (sprintf (buf, "%Lg", x.value) < 0
373 || !strisnan (buf, 0, strlen (buf)))
376 { /* Unnormalized number. */
377 static union { unsigned int word[4]; long double value; } x =
378 { LDBL80_WORDS (0x4000, 0x63333333, 0x00000000) };
379 if (sprintf (buf, "%Lf", x.value) < 0
380 || !strisnan (buf, 0, strlen (buf)))
382 if (sprintf (buf, "%Le", x.value) < 0
383 || !strisnan (buf, 0, strlen (buf)))
385 if (sprintf (buf, "%Lg", x.value) < 0
386 || !strisnan (buf, 0, strlen (buf)))
389 { /* Pseudo-Denormal. */
390 static union { unsigned int word[4]; long double value; } x =
391 { LDBL80_WORDS (0x0000, 0x83333333, 0x00000000) };
392 if (sprintf (buf, "%Lf", x.value) < 0
393 || !strisnan (buf, 0, strlen (buf)))
395 if (sprintf (buf, "%Le", x.value) < 0
396 || !strisnan (buf, 0, strlen (buf)))
398 if (sprintf (buf, "%Lg", x.value) < 0
399 || !strisnan (buf, 0, strlen (buf)))
405 [gl_cv_func_printf_infinite_long_double=yes],
406 [gl_cv_func_printf_infinite_long_double=no],
410 # Guess no on ia64, x86_64, i386.
411 ia64 | x86_64 | i*86) gl_cv_func_printf_infinite_long_double="guessing no";;
414 # Guess yes on glibc systems.
415 *-gnu*) gl_cv_func_printf_infinite_long_double="guessing yes";;
416 # Guess yes on FreeBSD >= 6.
417 freebsd[1-5]*) gl_cv_func_printf_infinite_long_double="guessing no";;
418 freebsd* | kfreebsd*) gl_cv_func_printf_infinite_long_double="guessing yes";;
419 # Guess yes on MacOS X >= 10.3.
420 darwin[1-6].*) gl_cv_func_printf_infinite_long_double="guessing no";;
421 darwin*) gl_cv_func_printf_infinite_long_double="guessing yes";;
422 # Guess yes on HP-UX >= 11.
423 hpux[7-9]* | hpux10*) gl_cv_func_printf_infinite_long_double="guessing no";;
424 hpux*) gl_cv_func_printf_infinite_long_double="guessing yes";;
425 # Guess yes on NetBSD >= 3.
426 netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
427 gl_cv_func_printf_infinite_long_double="guessing no";;
428 netbsd*) gl_cv_func_printf_infinite_long_double="guessing yes";;
429 # If we don't know, assume the worst.
430 *) gl_cv_func_printf_infinite_long_double="guessing no";;
439 gl_cv_func_printf_infinite_long_double="irrelevant"
444 dnl Test whether the *printf family of functions supports the 'a' and 'A'
445 dnl conversion specifier for hexadecimal output of floating-point numbers.
446 dnl (ISO C99, POSIX:2001)
447 dnl Result is gl_cv_func_printf_directive_a.
449 AC_DEFUN([gl_PRINTF_DIRECTIVE_A],
451 AC_REQUIRE([AC_PROG_CC])
452 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
453 AC_CACHE_CHECK([whether printf supports the 'a' and 'A' directives],
454 [gl_cv_func_printf_directive_a],
459 static char buf[100];
462 if (sprintf (buf, "%a %d", 3.1416015625, 33, 44, 55) < 0
463 || (strcmp (buf, "0x1.922p+1 33") != 0
464 && strcmp (buf, "0x3.244p+0 33") != 0
465 && strcmp (buf, "0x6.488p-1 33") != 0
466 && strcmp (buf, "0xc.91p-2 33") != 0))
468 if (sprintf (buf, "%A %d", -3.1416015625, 33, 44, 55) < 0
469 || (strcmp (buf, "-0X1.922P+1 33") != 0
470 && strcmp (buf, "-0X3.244P+0 33") != 0
471 && strcmp (buf, "-0X6.488P-1 33") != 0
472 && strcmp (buf, "-0XC.91P-2 33") != 0))
474 /* This catches a FreeBSD 6.1 bug: it doesn't round. */
475 if (sprintf (buf, "%.2a %d", 1.51, 33, 44, 55) < 0
476 || (strcmp (buf, "0x1.83p+0 33") != 0
477 && strcmp (buf, "0x3.05p-1 33") != 0
478 && strcmp (buf, "0x6.0ap-2 33") != 0
479 && strcmp (buf, "0xc.14p-3 33") != 0))
481 /* This catches a FreeBSD 6.1 bug. See
482 <http://lists.gnu.org/archive/html/bug-gnulib/2007-04/msg00107.html> */
483 if (sprintf (buf, "%010a %d", 1.0 / 0.0, 33, 44, 55) < 0
486 /* This catches a MacOS X 10.3.9 (Darwin 7.9) bug. */
487 if (sprintf (buf, "%.1a", 1.999) < 0
488 || (strcmp (buf, "0x1.0p+1") != 0
489 && strcmp (buf, "0x2.0p+0") != 0
490 && strcmp (buf, "0x4.0p-1") != 0
491 && strcmp (buf, "0x8.0p-2") != 0))
493 /* This catches the same MacOS X 10.3.9 (Darwin 7.9) bug and also a
494 glibc 2.4 bug <http://sourceware.org/bugzilla/show_bug.cgi?id=2908>. */
495 if (sprintf (buf, "%.1La", 1.999L) < 0
496 || (strcmp (buf, "0x1.0p+1") != 0
497 && strcmp (buf, "0x2.0p+0") != 0
498 && strcmp (buf, "0x4.0p-1") != 0
499 && strcmp (buf, "0x8.0p-2") != 0))
502 }], [gl_cv_func_printf_directive_a=yes], [gl_cv_func_printf_directive_a=no],
505 # Guess yes on glibc >= 2.5 systems.
507 AC_EGREP_CPP([BZ2908], [
508 #include <features.h>
509 #ifdef __GNU_LIBRARY__
510 #if (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 5) || (__GLIBC__ > 2)
515 [gl_cv_func_printf_directive_a="guessing yes"],
516 [gl_cv_func_printf_directive_a="guessing no"])
518 # If we don't know, assume the worst.
519 *) gl_cv_func_printf_directive_a="guessing no";;
525 dnl Test whether the *printf family of functions supports the %F format
526 dnl directive. (ISO C99, POSIX:2001)
527 dnl Result is gl_cv_func_printf_directive_f.
529 AC_DEFUN([gl_PRINTF_DIRECTIVE_F],
531 AC_REQUIRE([AC_PROG_CC])
532 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
533 AC_CACHE_CHECK([whether printf supports the 'F' directive],
534 [gl_cv_func_printf_directive_f],
539 static char buf[100];
542 if (sprintf (buf, "%F %d", 1234567.0, 33, 44, 55) < 0
543 || strcmp (buf, "1234567.000000 33") != 0)
545 if (sprintf (buf, "%F", 1.0 / 0.0) < 0
546 || (strcmp (buf, "INF") != 0 && strcmp (buf, "INFINITY") != 0))
548 /* This catches a Cygwin 2007 bug. */
549 if (sprintf (buf, "%.F", 1234.0) < 0
550 || strcmp (buf, "1234") != 0)
553 }], [gl_cv_func_printf_directive_f=yes], [gl_cv_func_printf_directive_f=no],
557 # Guess yes on glibc systems.
558 *-gnu*) gl_cv_func_printf_directive_f="guessing yes";;
559 # Guess yes on FreeBSD >= 6.
560 freebsd[1-5]*) gl_cv_func_printf_directive_f="guessing no";;
561 freebsd* | kfreebsd*) gl_cv_func_printf_directive_f="guessing yes";;
562 # Guess yes on MacOS X >= 10.3.
563 darwin[1-6].*) gl_cv_func_printf_directive_f="guessing no";;
564 darwin*) gl_cv_func_printf_directive_f="guessing yes";;
565 # Guess yes on Solaris >= 2.10.
566 solaris2.[0-9]*) gl_cv_func_printf_directive_f="guessing no";;
567 solaris*) gl_cv_func_printf_directive_f="guessing yes";;
568 # If we don't know, assume the worst.
569 *) gl_cv_func_printf_directive_f="guessing no";;
576 dnl Test whether the *printf family of functions supports the %n format
577 dnl directive. (ISO C99, POSIX:2001)
578 dnl Result is gl_cv_func_printf_directive_n.
580 AC_DEFUN([gl_PRINTF_DIRECTIVE_N],
582 AC_REQUIRE([AC_PROG_CC])
583 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
584 AC_CACHE_CHECK([whether printf supports the 'n' directive],
585 [gl_cv_func_printf_directive_n],
590 static char fmtstring[10];
591 static char buf[100];
595 /* Copy the format string. Some systems (glibc with _FORTIFY_SOURCE=2)
596 support %n in format strings in read-only memory but not in writable
598 strcpy (fmtstring, "%d %n");
599 if (sprintf (buf, fmtstring, 123, &count, 33, 44, 55) < 0
600 || strcmp (buf, "123 ") != 0
604 }], [gl_cv_func_printf_directive_n=yes], [gl_cv_func_printf_directive_n=no],
608 *) gl_cv_func_printf_directive_n="guessing yes";;
615 dnl Test whether the *printf family of functions supports POSIX/XSI format
616 dnl strings with positions. (POSIX:2001)
617 dnl Result is gl_cv_func_printf_positions.
619 AC_DEFUN([gl_PRINTF_POSITIONS],
621 AC_REQUIRE([AC_PROG_CC])
622 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
623 AC_CACHE_CHECK([whether printf supports POSIX/XSI format strings with positions],
624 [gl_cv_func_printf_positions],
629 /* The string "%2$d %1$d", with dollar characters protected from the shell's
630 dollar expansion (possibly an autoconf bug). */
631 static char format[] = { '%', '2', '$', 'd', ' ', '%', '1', '$', 'd', '\0' };
632 static char buf[100];
635 sprintf (buf, format, 33, 55);
636 return (strcmp (buf, "55 33") != 0);
637 }], [gl_cv_func_printf_positions=yes], [gl_cv_func_printf_positions=no],
641 netbsd[1-3]* | netbsdelf[1-3]* | netbsdaout[1-3]* | netbsdcoff[1-3]*)
642 gl_cv_func_printf_positions="guessing no";;
643 beos*) gl_cv_func_printf_positions="guessing no";;
644 mingw* | pw*) gl_cv_func_printf_positions="guessing no";;
645 *) gl_cv_func_printf_positions="guessing yes";;
652 dnl Test whether the *printf family of functions supports POSIX/XSI format
653 dnl strings with the ' flag for grouping of decimal digits. (POSIX:2001)
654 dnl Result is gl_cv_func_printf_flag_grouping.
656 AC_DEFUN([gl_PRINTF_FLAG_GROUPING],
658 AC_REQUIRE([AC_PROG_CC])
659 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
660 AC_CACHE_CHECK([whether printf supports the grouping flag],
661 [gl_cv_func_printf_flag_grouping],
666 static char buf[100];
669 if (sprintf (buf, "%'d %d", 1234567, 99) < 0
670 || buf[strlen (buf) - 1] != '9')
673 }], [gl_cv_func_printf_flag_grouping=yes], [gl_cv_func_printf_flag_grouping=no],
677 cygwin*) gl_cv_func_printf_flag_grouping="guessing no";;
678 netbsd*) gl_cv_func_printf_flag_grouping="guessing no";;
679 mingw* | pw*) gl_cv_func_printf_flag_grouping="guessing no";;
680 *) gl_cv_func_printf_flag_grouping="guessing yes";;
687 dnl Test whether the *printf family of functions supports the - flag correctly.
689 dnl <http://lists.gnu.org/archive/html/bug-coreutils/2008-02/msg00035.html>
690 dnl Result is gl_cv_func_printf_flag_leftadjust.
692 AC_DEFUN([gl_PRINTF_FLAG_LEFTADJUST],
694 AC_REQUIRE([AC_PROG_CC])
695 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
696 AC_CACHE_CHECK([whether printf supports the left-adjust flag correctly],
697 [gl_cv_func_printf_flag_leftadjust],
702 static char buf[100];
705 /* Check that a '-' flag is not annihilated by a negative width. */
706 if (sprintf (buf, "a%-*sc", -3, "b") < 0
707 || strcmp (buf, "ab c") != 0)
711 [gl_cv_func_printf_flag_leftadjust=yes],
712 [gl_cv_func_printf_flag_leftadjust=no],
716 # Guess yes on HP-UX 11.
717 hpux11*) gl_cv_func_printf_flag_leftadjust="guessing yes";;
718 # Guess no on HP-UX 10 and older.
719 hpux*) gl_cv_func_printf_flag_leftadjust="guessing no";;
720 # Guess yes otherwise.
721 *) gl_cv_func_printf_flag_leftadjust="guessing yes";;
728 dnl Test whether the *printf family of functions supports padding of non-finite
729 dnl values with the 0 flag correctly. (ISO C99 + TC1 + TC2.) See
730 dnl <http://lists.gnu.org/archive/html/bug-gnulib/2007-04/msg00107.html>
731 dnl Result is gl_cv_func_printf_flag_zero.
733 AC_DEFUN([gl_PRINTF_FLAG_ZERO],
735 AC_REQUIRE([AC_PROG_CC])
736 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
737 AC_CACHE_CHECK([whether printf supports the zero flag correctly],
738 [gl_cv_func_printf_flag_zero],
743 static char buf[100];
746 if (sprintf (buf, "%010f", 1.0 / 0.0, 33, 44, 55) < 0
747 || (strcmp (buf, " inf") != 0
748 && strcmp (buf, " infinity") != 0))
751 }], [gl_cv_func_printf_flag_zero=yes], [gl_cv_func_printf_flag_zero=no],
755 # Guess yes on glibc systems.
756 *-gnu*) gl_cv_func_printf_flag_zero="guessing yes";;
758 beos*) gl_cv_func_printf_flag_zero="guessing yes";;
759 # If we don't know, assume the worst.
760 *) gl_cv_func_printf_flag_zero="guessing no";;
767 dnl Test whether the *printf family of functions supports large precisions.
768 dnl On mingw, precisions larger than 512 are treated like 512, in integer,
769 dnl floating-point or pointer output. On BeOS, precisions larger than 1044
770 dnl crash the program.
771 dnl Result is gl_cv_func_printf_precision.
773 AC_DEFUN([gl_PRINTF_PRECISION],
775 AC_REQUIRE([AC_PROG_CC])
776 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
777 AC_CACHE_CHECK([whether printf supports large precisions],
778 [gl_cv_func_printf_precision],
783 static char buf[5000];
787 /* On BeOS, this would crash and show a dialog box. Avoid the crash. */
790 if (sprintf (buf, "%.4000d %d", 1, 33, 44) < 4000 + 3)
793 }], [gl_cv_func_printf_precision=yes], [gl_cv_func_printf_precision=no],
797 # Guess no only on native Win32 and BeOS systems.
798 mingw* | pw*) gl_cv_func_printf_precision="guessing no" ;;
799 beos*) gl_cv_func_printf_precision="guessing no" ;;
800 *) gl_cv_func_printf_precision="guessing yes" ;;
807 dnl Test whether the *printf family of functions recovers gracefully in case
808 dnl of an out-of-memory condition, or whether it crashes the entire program.
809 dnl Result is gl_cv_func_printf_enomem.
811 AC_DEFUN([gl_PRINTF_ENOMEM],
813 AC_REQUIRE([AC_PROG_CC])
814 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
815 AC_CACHE_CHECK([whether printf survives out-of-memory conditions],
816 [gl_cv_func_printf_enomem],
818 if test "$cross_compiling" = no; then
819 AC_LANG_CONFTEST([AC_LANG_SOURCE([
823 #include <sys/types.h>
824 #include <sys/time.h>
825 #include <sys/resource.h>
832 /* Some printf implementations allocate temporary space with malloc. */
833 /* On BSD systems, malloc() is limited by RLIMIT_DATA. */
835 if (getrlimit (RLIMIT_DATA, &limit) < 0)
837 if (limit.rlim_max == RLIM_INFINITY || limit.rlim_max > 5000000)
838 limit.rlim_max = 5000000;
839 limit.rlim_cur = limit.rlim_max;
840 if (setrlimit (RLIMIT_DATA, &limit) < 0)
843 /* On Linux systems, malloc() is limited by RLIMIT_AS. */
845 if (getrlimit (RLIMIT_AS, &limit) < 0)
847 if (limit.rlim_max == RLIM_INFINITY || limit.rlim_max > 5000000)
848 limit.rlim_max = 5000000;
849 limit.rlim_cur = limit.rlim_max;
850 if (setrlimit (RLIMIT_AS, &limit) < 0)
853 /* Some printf implementations allocate temporary space on the stack. */
855 if (getrlimit (RLIMIT_STACK, &limit) < 0)
857 if (limit.rlim_max == RLIM_INFINITY || limit.rlim_max > 5000000)
858 limit.rlim_max = 5000000;
859 limit.rlim_cur = limit.rlim_max;
860 if (setrlimit (RLIMIT_STACK, &limit) < 0)
863 ret = printf ("%.5000000f", 1.0);
864 return !(ret == 5000002 || (ret < 0 && errno == ENOMEM));
868 if AC_TRY_EVAL([ac_link]) && test -s conftest$ac_exeext; then
871 if test $result != 0 && test $result != 77; then result=1; fi
873 ) >/dev/null 2>/dev/null
875 0) gl_cv_func_printf_enomem="yes" ;;
876 77) gl_cv_func_printf_enomem="guessing no" ;;
877 *) gl_cv_func_printf_enomem="no" ;;
880 gl_cv_func_printf_enomem="guessing no"
886 # Guess yes on glibc systems.
887 *-gnu*) gl_cv_func_printf_enomem="guessing yes";;
888 # Guess yes on Solaris.
889 solaris*) gl_cv_func_printf_enomem="guessing yes";;
891 aix*) gl_cv_func_printf_enomem="guessing yes";;
892 # Guess yes on HP-UX/hppa.
893 hpux*) case "$host_cpu" in
894 hppa*) gl_cv_func_printf_enomem="guessing yes";;
895 *) gl_cv_func_printf_enomem="guessing no";;
899 irix*) gl_cv_func_printf_enomem="guessing yes";;
900 # Guess yes on OSF/1.
901 osf*) gl_cv_func_printf_enomem="guessing yes";;
903 beos*) gl_cv_func_printf_enomem="guessing yes";;
904 # If we don't know, assume the worst.
905 *) gl_cv_func_printf_enomem="guessing no";;
912 dnl Test whether the snprintf function exists. (ISO C99, POSIX:2001)
913 dnl Result is ac_cv_func_snprintf.
915 AC_DEFUN([gl_SNPRINTF_PRESENCE],
917 AC_CHECK_FUNCS_ONCE([snprintf])
920 dnl Test whether the string produced by the snprintf function is always NUL
921 dnl terminated. (ISO C99, POSIX:2001)
922 dnl Result is gl_cv_func_snprintf_truncation_c99.
924 AC_DEFUN([gl_SNPRINTF_TRUNCATION_C99],
926 AC_REQUIRE([AC_PROG_CC])
927 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
928 AC_CACHE_CHECK([whether snprintf truncates the result as in C99],
929 [gl_cv_func_snprintf_truncation_c99],
934 static char buf[100];
937 strcpy (buf, "ABCDEF");
938 snprintf (buf, 3, "%d %d", 4567, 89);
939 if (memcmp (buf, "45\0DEF", 6) != 0)
942 }], [gl_cv_func_snprintf_truncation_c99=yes], [gl_cv_func_snprintf_truncation_c99=no],
946 # Guess yes on glibc systems.
947 *-gnu*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
948 # Guess yes on FreeBSD >= 5.
949 freebsd[1-4]*) gl_cv_func_snprintf_truncation_c99="guessing no";;
950 freebsd* | kfreebsd*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
951 # Guess yes on MacOS X >= 10.3.
952 darwin[1-6].*) gl_cv_func_snprintf_truncation_c99="guessing no";;
953 darwin*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
954 # Guess yes on OpenBSD >= 3.9.
955 openbsd[1-2].* | openbsd3.[0-8] | openbsd3.[0-8].*)
956 gl_cv_func_snprintf_truncation_c99="guessing no";;
957 openbsd*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
958 # Guess yes on Solaris >= 2.6.
959 solaris2.[0-5]*) gl_cv_func_snprintf_truncation_c99="guessing no";;
960 solaris*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
961 # Guess yes on AIX >= 4.
962 aix[1-3]*) gl_cv_func_snprintf_truncation_c99="guessing no";;
963 aix*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
964 # Guess yes on HP-UX >= 11.
965 hpux[7-9]* | hpux10*) gl_cv_func_snprintf_truncation_c99="guessing no";;
966 hpux*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
967 # Guess yes on IRIX >= 6.5.
968 irix6.5) gl_cv_func_snprintf_truncation_c99="guessing yes";;
969 # Guess yes on OSF/1 >= 5.
970 osf[3-4]*) gl_cv_func_snprintf_truncation_c99="guessing no";;
971 osf*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
972 # Guess yes on NetBSD >= 3.
973 netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
974 gl_cv_func_snprintf_truncation_c99="guessing no";;
975 netbsd*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
977 beos*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
978 # If we don't know, assume the worst.
979 *) gl_cv_func_snprintf_truncation_c99="guessing no";;
986 dnl Test whether the return value of the snprintf function is the number
987 dnl of bytes (excluding the terminating NUL) that would have been produced
988 dnl if the buffer had been large enough. (ISO C99, POSIX:2001)
989 dnl For example, this test program fails on IRIX 6.5:
990 dnl ---------------------------------------------------------------------
991 dnl #include <stdio.h>
994 dnl static char buf[8];
995 dnl int retval = snprintf (buf, 3, "%d", 12345);
996 dnl return retval >= 0 && retval < 3;
998 dnl ---------------------------------------------------------------------
999 dnl Result is gl_cv_func_snprintf_retval_c99.
1001 AC_DEFUN([gl_SNPRINTF_RETVAL_C99],
1003 AC_REQUIRE([AC_PROG_CC])
1004 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
1005 AC_CACHE_CHECK([whether snprintf returns a byte count as in C99],
1006 [gl_cv_func_snprintf_retval_c99],
1011 static char buf[100];
1014 strcpy (buf, "ABCDEF");
1015 if (snprintf (buf, 3, "%d %d", 4567, 89) != 7)
1018 }], [gl_cv_func_snprintf_retval_c99=yes], [gl_cv_func_snprintf_retval_c99=no],
1022 # Guess yes on glibc systems.
1023 *-gnu*) gl_cv_func_snprintf_retval_c99="guessing yes";;
1024 # Guess yes on FreeBSD >= 5.
1025 freebsd[1-4]*) gl_cv_func_snprintf_retval_c99="guessing no";;
1026 freebsd* | kfreebsd*) gl_cv_func_snprintf_retval_c99="guessing yes";;
1027 # Guess yes on MacOS X >= 10.3.
1028 darwin[1-6].*) gl_cv_func_snprintf_retval_c99="guessing no";;
1029 darwin*) gl_cv_func_snprintf_retval_c99="guessing yes";;
1030 # Guess yes on OpenBSD >= 3.9.
1031 openbsd[1-2].* | openbsd3.[0-8] | openbsd3.[0-8].*)
1032 gl_cv_func_snprintf_retval_c99="guessing no";;
1033 openbsd*) gl_cv_func_snprintf_retval_c99="guessing yes";;
1034 # Guess yes on Solaris >= 2.6.
1035 solaris2.[0-5]*) gl_cv_func_snprintf_retval_c99="guessing no";;
1036 solaris*) gl_cv_func_snprintf_retval_c99="guessing yes";;
1037 # Guess yes on AIX >= 4.
1038 aix[1-3]*) gl_cv_func_snprintf_retval_c99="guessing no";;
1039 aix*) gl_cv_func_snprintf_retval_c99="guessing yes";;
1040 # Guess yes on NetBSD >= 3.
1041 netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
1042 gl_cv_func_snprintf_retval_c99="guessing no";;
1043 netbsd*) gl_cv_func_snprintf_retval_c99="guessing yes";;
1044 # Guess yes on BeOS.
1045 beos*) gl_cv_func_snprintf_retval_c99="guessing yes";;
1046 # If we don't know, assume the worst.
1047 *) gl_cv_func_snprintf_retval_c99="guessing no";;
1054 dnl Test whether the snprintf function supports the %n format directive
1055 dnl also in truncated portions of the format string. (ISO C99, POSIX:2001)
1056 dnl Result is gl_cv_func_snprintf_directive_n.
1058 AC_DEFUN([gl_SNPRINTF_DIRECTIVE_N],
1060 AC_REQUIRE([AC_PROG_CC])
1061 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
1062 AC_CACHE_CHECK([whether snprintf fully supports the 'n' directive],
1063 [gl_cv_func_snprintf_directive_n],
1068 static char fmtstring[10];
1069 static char buf[100];
1073 /* Copy the format string. Some systems (glibc with _FORTIFY_SOURCE=2)
1074 support %n in format strings in read-only memory but not in writable
1076 strcpy (fmtstring, "%d %n");
1077 snprintf (buf, 4, fmtstring, 12345, &count, 33, 44, 55);
1081 }], [gl_cv_func_snprintf_directive_n=yes], [gl_cv_func_snprintf_directive_n=no],
1085 # Guess yes on glibc systems.
1086 *-gnu*) gl_cv_func_snprintf_directive_n="guessing yes";;
1087 # Guess yes on FreeBSD >= 5.
1088 freebsd[1-4]*) gl_cv_func_snprintf_directive_n="guessing no";;
1089 freebsd* | kfreebsd*) gl_cv_func_snprintf_directive_n="guessing yes";;
1090 # Guess yes on MacOS X >= 10.3.
1091 darwin[1-6].*) gl_cv_func_snprintf_directive_n="guessing no";;
1092 darwin*) gl_cv_func_snprintf_directive_n="guessing yes";;
1093 # Guess yes on Solaris >= 2.6.
1094 solaris2.[0-5]*) gl_cv_func_snprintf_directive_n="guessing no";;
1095 solaris*) gl_cv_func_snprintf_directive_n="guessing yes";;
1096 # Guess yes on AIX >= 4.
1097 aix[1-3]*) gl_cv_func_snprintf_directive_n="guessing no";;
1098 aix*) gl_cv_func_snprintf_directive_n="guessing yes";;
1099 # Guess yes on IRIX >= 6.5.
1100 irix6.5) gl_cv_func_snprintf_directive_n="guessing yes";;
1101 # Guess yes on OSF/1 >= 5.
1102 osf[3-4]*) gl_cv_func_snprintf_directive_n="guessing no";;
1103 osf*) gl_cv_func_snprintf_directive_n="guessing yes";;
1104 # Guess yes on NetBSD >= 3.
1105 netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
1106 gl_cv_func_snprintf_directive_n="guessing no";;
1107 netbsd*) gl_cv_func_snprintf_directive_n="guessing yes";;
1108 # Guess yes on BeOS.
1109 beos*) gl_cv_func_snprintf_directive_n="guessing yes";;
1110 # If we don't know, assume the worst.
1111 *) gl_cv_func_snprintf_directive_n="guessing no";;
1118 dnl Test whether the vsnprintf function, when passed a zero size, produces no
1119 dnl output. (ISO C99, POSIX:2001)
1120 dnl For example, snprintf nevertheless writes a NUL byte in this case
1122 dnl ---------------------------------------------------------------------
1123 dnl #include <stdio.h>
1126 dnl static char buf[8] = "DEADBEEF";
1127 dnl snprintf (buf, 0, "%d", 12345);
1128 dnl return buf[0] != 'D';
1130 dnl ---------------------------------------------------------------------
1131 dnl And vsnprintf writes any output without bounds in this case, behaving like
1132 dnl vsprintf, on HP-UX 11 and OSF/1 5.1:
1133 dnl ---------------------------------------------------------------------
1134 dnl #include <stdarg.h>
1135 dnl #include <stdio.h>
1136 dnl static int my_snprintf (char *buf, int size, const char *format, ...)
1140 dnl va_start (args, format);
1141 dnl ret = vsnprintf (buf, size, format, args);
1147 dnl static char buf[8] = "DEADBEEF";
1148 dnl my_snprintf (buf, 0, "%d", 12345);
1149 dnl return buf[0] != 'D';
1151 dnl ---------------------------------------------------------------------
1152 dnl Result is gl_cv_func_vsnprintf_zerosize_c99.
1154 AC_DEFUN([gl_VSNPRINTF_ZEROSIZE_C99],
1156 AC_REQUIRE([AC_PROG_CC])
1157 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
1158 AC_CACHE_CHECK([whether vsnprintf respects a zero size as in C99],
1159 [gl_cv_func_vsnprintf_zerosize_c99],
1164 static int my_snprintf (char *buf, int size, const char *format, ...)
1168 va_start (args, format);
1169 ret = vsnprintf (buf, size, format, args);
1175 static char buf[8] = "DEADBEEF";
1176 my_snprintf (buf, 0, "%d", 12345);
1177 return buf[0] != 'D';
1179 [gl_cv_func_vsnprintf_zerosize_c99=yes],
1180 [gl_cv_func_vsnprintf_zerosize_c99=no],
1184 # Guess yes on glibc systems.
1185 *-gnu*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1186 # Guess yes on FreeBSD >= 5.
1187 freebsd[1-4]*) gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
1188 freebsd* | kfreebsd*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1189 # Guess yes on MacOS X >= 10.3.
1190 darwin[1-6].*) gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
1191 darwin*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1192 # Guess yes on Cygwin.
1193 cygwin*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1194 # Guess yes on Solaris >= 2.6.
1195 solaris2.[0-5]*) gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
1196 solaris*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1197 # Guess yes on AIX >= 4.
1198 aix[1-3]*) gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
1199 aix*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1200 # Guess yes on IRIX >= 6.5.
1201 irix6.5) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1202 # Guess yes on NetBSD >= 3.
1203 netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
1204 gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
1205 netbsd*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1206 # Guess yes on BeOS.
1207 beos*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1208 # Guess yes on mingw.
1209 mingw* | pw*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
1210 # If we don't know, assume the worst.
1211 *) gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
1218 dnl The results of these tests on various platforms are:
1220 dnl 1 = gl_PRINTF_SIZES_C99
1221 dnl 2 = gl_PRINTF_LONG_DOUBLE
1222 dnl 3 = gl_PRINTF_INFINITE
1223 dnl 4 = gl_PRINTF_INFINITE_LONG_DOUBLE
1224 dnl 5 = gl_PRINTF_DIRECTIVE_A
1225 dnl 6 = gl_PRINTF_DIRECTIVE_F
1226 dnl 7 = gl_PRINTF_DIRECTIVE_N
1227 dnl 8 = gl_PRINTF_POSITIONS
1228 dnl 9 = gl_PRINTF_FLAG_GROUPING
1229 dnl 10 = gl_PRINTF_FLAG_LEFTADJUST
1230 dnl 11 = gl_PRINTF_FLAG_ZERO
1231 dnl 12 = gl_PRINTF_PRECISION
1232 dnl 13 = gl_PRINTF_ENOMEM
1233 dnl 14 = gl_SNPRINTF_PRESENCE
1234 dnl 15 = gl_SNPRINTF_TRUNCATION_C99
1235 dnl 16 = gl_SNPRINTF_RETVAL_C99
1236 dnl 17 = gl_SNPRINTF_DIRECTIVE_N
1237 dnl 18 = gl_VSNPRINTF_ZEROSIZE_C99
1239 dnl 1 = checking whether printf supports size specifiers as in C99...
1240 dnl 2 = checking whether printf supports 'long double' arguments...
1241 dnl 3 = checking whether printf supports infinite 'double' arguments...
1242 dnl 4 = checking whether printf supports infinite 'long double' arguments...
1243 dnl 5 = checking whether printf supports the 'a' and 'A' directives...
1244 dnl 6 = checking whether printf supports the 'F' directive...
1245 dnl 7 = checking whether printf supports the 'n' directive...
1246 dnl 8 = checking whether printf supports POSIX/XSI format strings with positions...
1247 dnl 9 = checking whether printf supports the grouping flag...
1248 dnl 10 = checking whether printf supports the left-adjust flag correctly...
1249 dnl 11 = checking whether printf supports the zero flag correctly...
1250 dnl 12 = checking whether printf supports large precisions...
1251 dnl 13 = checking whether printf survives out-of-memory conditions...
1252 dnl 14 = checking for snprintf...
1253 dnl 15 = checking whether snprintf truncates the result as in C99...
1254 dnl 16 = checking whether snprintf returns a byte count as in C99...
1255 dnl 17 = checking whether snprintf fully supports the 'n' directive...
1256 dnl 18 = checking whether vsnprintf respects a zero size as in C99...
1258 dnl . = yes, # = no.
1260 dnl 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
1261 dnl glibc 2.5 . . . . . . . . . . . . . . . . . .
1262 dnl glibc 2.3.6 . . . . # . . . . . . . . . . . . .
1263 dnl FreeBSD 5.4, 6.1 . . . . # . . . . . # . # . . . . .
1264 dnl MacOS X 10.3.9 . . . . # . . . . . # . # . . . . .
1265 dnl OpenBSD 3.9, 4.0 . . # # # # . . # . # . # . . . . .
1266 dnl Cygwin 2007 (= Cygwin 1.5.24) . . . . # # . . . ? # ? ? . . . . .
1267 dnl Cygwin 2006 (= Cygwin 1.5.19) # . . . # # . . # ? # ? ? . . . . .
1268 dnl Solaris 10 . . # # # . . . . . # . . . . . . .
1269 dnl Solaris 2.6 ... 9 # . # # # # . . . . # . . . . . . .
1270 dnl Solaris 2.5.1 # . # # # # . . . . # . . # # # # #
1271 dnl AIX 5.2 . . # # # . . . . . # . . . . . . .
1272 dnl AIX 4.3.2, 5.1 # . # # # # . . . . # . . . . . . .
1273 dnl HP-UX 11.31 . . . . # . . . . . # . . . . # # .
1274 dnl HP-UX 11.{00,11,23} # . . . # # . . . . # . . . . # # #
1275 dnl HP-UX 10.20 # . . . # # . . . # # . . . . # # #
1276 dnl IRIX 6.5 # . # # # # . . . . # . . . . # . .
1277 dnl OSF/1 5.1 # . # # # # . . . . # . . . . # . #
1278 dnl OSF/1 4.0d # . # # # # . . . . # . . # # # # #
1279 dnl NetBSD 4.0 . ? ? ? ? ? . . ? ? ? ? ? . . . ? ?
1280 dnl NetBSD 3.0 . . . . # # . # # ? # . # . . . . .
1281 dnl BeOS # # . # # # . # . ? . # ? . . . . .
1282 dnl mingw # # # # # # . # # . # # ? . # # # .