/[autoconf]/autoconf/lib/autoconf/functions.m4
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revision 1.58 by eggert, Sat Apr 20 06:09:02 2002 UTC revision 1.59 by eggert, Wed May 8 19:56:55 2002 UTC
# Line 1295  test $ac_cv_func_strnlen_working = no && Line 1295  test $ac_cv_func_strnlen_working = no &&
1295  # AC_FUNC_SETVBUF_REVERSED  # AC_FUNC_SETVBUF_REVERSED
1296  # ------------------------  # ------------------------
1297  AC_DEFUN([AC_FUNC_SETVBUF_REVERSED],  AC_DEFUN([AC_FUNC_SETVBUF_REVERSED],
1298  [AC_CACHE_CHECK(whether setvbuf arguments are reversed,  [AC_REQUIRE([AC_C_PROTOTYPES])dnl
1299    AC_CACHE_CHECK(whether setvbuf arguments are reversed,
1300    ac_cv_func_setvbuf_reversed,    ac_cv_func_setvbuf_reversed,
1301  [AC_TRY_RUN([#include <stdio.h>    [ac_cv_func_setvbuf_reversed=no
1302  /* If setvbuf has the reversed format, exit 0. */     AC_LINK_IFELSE(
1303  int       [AC_LANG_PROGRAM(
1304  main ()          [[#include <stdio.h>
1305  {  #         if PROTOTYPES
1306    /* This call has the arguments reversed.             int (setvbuf) (FILE *, int, char *, size_t);
1307       A reversed system may check and see that the address of main  #         endif]],
1308       is not _IOLBF, _IONBF, or _IOFBF, and return nonzero.  */          [[char buf; return setvbuf (stdout, _IOLBF, &buf, 1);]])],
1309    if (setvbuf(stdout, _IOLBF, (char *) main, BUFSIZ) != 0)       [AC_LINK_IFELSE(
1310      exit(1);          [AC_LANG_PROGRAM(
1311    putc('\r', stdout);             [[#include <stdio.h>
1312    exit(0);                      /* Non-reversed systems segv here.  */  #            if PROTOTYPES
1313  }], ac_cv_func_setvbuf_reversed=yes, ac_cv_func_setvbuf_reversed=no)                int (setvbuf) (FILE *, int, char *, size_t);
1314  rm -f core core.* *.core])  #            endif]],
1315               [[char buf; return setvbuf (stdout, &buf, _IOLBF, 1);]])],
1316            [# It compiles and links either way, so it must not be declared
1317             # with a prototype and most likely this is a K&R C compiler.
1318             # Try running it.
1319             AC_RUN_IFELSE(
1320               [AC_LANG_PROGRAM(
1321                  [[#include <stdio.h>]],
1322                  [[/* This call has the arguments reversed.
1323                       A reversed system may check and see that the address of buf
1324                       is not _IOLBF, _IONBF, or _IOFBF, and return nonzero.  */
1325                    char buf;
1326                    if (setvbuf (stdout, _IOLBF, &buf, 1) != 0)
1327                      exit (1);
1328                    putchar ('\r');
1329                    exit (0); /* Non-reversed systems SEGV here.  */]])],
1330               ac_cv_func_setvbuf_reversed=yes,
1331               rm -f core core.* *.core,
1332               [[: # Assume setvbuf is not reversed when cross-compiling.]])]
1333            ac_cv_func_setvbuf_reversed=yes)])])
1334  if test $ac_cv_func_setvbuf_reversed = yes; then  if test $ac_cv_func_setvbuf_reversed = yes; then
1335    AC_DEFINE(SETVBUF_REVERSED, 1,    AC_DEFINE(SETVBUF_REVERSED, 1,
1336              [Define to 1 if the `setvbuf' function takes the buffering type as              [Define to 1 if the `setvbuf' function takes the buffering type as

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