blob: f774a9efa4c87ba32f4da06a29b1b6821131ba98 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
|
# popen.m4 serial 1
dnl Copyright (C) 2009 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
AC_DEFUN([gl_FUNC_POPEN],
[
AC_REQUIRE([gl_STDIO_H_DEFAULTS])
AC_CACHE_CHECK([whether popen works with closed stdin],
[gl_cv_func_popen_works],
[
AC_RUN_IFELSE([AC_LANG_PROGRAM([[#include <stdio.h>
]], [FILE *child;
fclose (stdin);
fclose (stdout);
child = popen ("echo a", "r");
return !(fgetc (child) == 'a' && pclose (child) == 0);
])], [gl_cv_func_popen_works=yes], [gl_cv_func_popen_works=no],
dnl For now, only cygwin 1.5 or older is known to be broken.
[gl_cv_func_popen_works='guessing yes'])
])
if test "$gl_cv_func_popen_works" = no; then
REPLACE_POPEN=1
AC_LIBOBJ([popen])
gl_PREREQ_POPEN
fi
])
# Prerequisites of lib/popen.c.
AC_DEFUN([gl_PREREQ_POPEN],
[
AC_REQUIRE([AC_C_INLINE])
])
|
