diff options
Diffstat (limited to 'm4/fflush.m4')
| -rw-r--r-- | m4/fflush.m4 | 52 |
1 files changed, 30 insertions, 22 deletions
diff --git a/m4/fflush.m4 b/m4/fflush.m4 index f7645de..c16b314 100644 --- a/m4/fflush.m4 +++ b/m4/fflush.m4 @@ -1,6 +1,6 @@ -# fflush.m4 serial 8 +# fflush.m4 serial 15 -# Copyright (C) 2007-2011 Free Software Foundation, Inc. +# Copyright (C) 2007-2013 Free Software Foundation, Inc. # This file is free software; the Free Software Foundation # gives unlimited permission to copy and/or distribute it, # with or without modifications, as long as this notice is preserved. @@ -12,13 +12,30 @@ dnl unread input on seekable streams, rather than C99 undefined semantics. AC_DEFUN([gl_FUNC_FFLUSH], [ + AC_REQUIRE([gl_STDIO_H_DEFAULTS]) + gl_FUNC_FFLUSH_STDIN + if test $gl_cv_func_fflush_stdin != yes; then + REPLACE_FFLUSH=1 + fi +]) + +dnl Determine whether fflush works on input streams. +dnl Sets gl_cv_func_fflush_stdin. + +AC_DEFUN([gl_FUNC_FFLUSH_STDIN], +[ + AC_CHECK_HEADERS_ONCE([unistd.h]) AC_CACHE_CHECK([whether fflush works on input streams], [gl_cv_func_fflush_stdin], [echo hello world > conftest.txt AC_RUN_IFELSE([AC_LANG_PROGRAM( [[ #include <stdio.h> -#include <unistd.h> +#if HAVE_UNISTD_H +# include <unistd.h> +#else /* on Windows with MSVC */ +# include <io.h> +#endif ]], [[FILE *f = fopen ("conftest.txt", "r"); char buffer[10]; int fd; @@ -55,27 +72,18 @@ AC_DEFUN([gl_FUNC_FFLUSH], return 7; return 0; ]])], [gl_cv_func_fflush_stdin=yes], [gl_cv_func_fflush_stdin=no], - [dnl Pessimistically assume fflush is broken. - gl_cv_func_fflush_stdin=no]) + [gl_cv_func_fflush_stdin=cross]) rm conftest.txt ]) - if test $gl_cv_func_fflush_stdin = no; then - gl_REPLACE_FFLUSH - fi -]) - -AC_DEFUN([gl_REPLACE_FFLUSH], -[ - AC_LIBOBJ([fflush]) - AC_REQUIRE([gl_STDIO_H_DEFAULTS]) - REPLACE_FFLUSH=1 - gl_PREREQ_FFLUSH - gl_REPLACE_FSEEKO + case $gl_cv_func_fflush_stdin in + yes) gl_func_fflush_stdin=1 ;; + no) gl_func_fflush_stdin=0 ;; + *) gl_func_fflush_stdin='(-1)' ;; + esac + AC_DEFINE_UNQUOTED([FUNC_FFLUSH_STDIN], [$gl_func_fflush_stdin], + [Define to 1 if fflush is known to work on stdin as per POSIX.1-2008, + 0 if fflush is known to not work, -1 if unknown.]) ]) # Prerequisites of lib/fflush.c. -AC_DEFUN([gl_PREREQ_FFLUSH], -[ - AC_REQUIRE([AC_C_INLINE]) - : -]) +AC_DEFUN([gl_PREREQ_FFLUSH], [:]) |