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# tmpfile.m4 serial 4
# Copyright (C) 2007, 2009-2023 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.
# Written by Ben Pfaff.
# Check whether to use a replacement tmpfile() function.
# The native Windows tmpfile function always tries to put the temporary
# file in the root directory. (This behaviour is even documented in
# Microsoft's documentation!) This often fails for ordinary users who
# don't have the permissions to write in the root directory.
#
# We can't test for tmpfile even at runtime, since our test program
# might be running with privileges that allow it to write to the root
# directory, even though tmpfile wouldn't work in general. Instead,
# just test for a Windows platform (excluding Cygwin).
# On Android 4.3, tmpfile() always returns NULL, even if TMPDIR is set
# to a writable directory.
AC_DEFUN([gl_FUNC_TMPFILE], [
AC_REQUIRE([gl_STDIO_H_DEFAULTS])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether tmpfile works],
[gl_cv_func_tmpfile_works],
[AC_EGREP_CPP([choke me], [
#if defined _WIN32 && !defined __CYGWIN__
choke me
#endif
],
[gl_cv_func_tmpfile_works=no],
[AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#include <stdio.h>
#include <stdlib.h>
int
main (void)
{
return tmpfile () == NULL;
}]])],
[gl_cv_func_tmpfile_works=yes],
[gl_cv_func_tmpfile_works=no],
[case "$host_os" in
# Guess no on Android.
linux*-android*) gl_cv_func_tmpfile_works="guessing no" ;;
# Guess yes otherwise.
*) gl_cv_func_tmpfile_works="guessing yes" ;;
esac
])
])
])
case "$gl_cv_func_tmpfile_works" in
*yes) ;;
*) REPLACE_TMPFILE=1 ;;
esac
])
# Prerequisites of lib/tmpfile.c.
AC_DEFUN([gl_PREREQ_TMPFILE], [:])
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