summaryrefslogtreecommitdiffstats
path: root/m4/tmpfile.m4
diff options
context:
space:
mode:
Diffstat (limited to 'm4/tmpfile.m4')
-rw-r--r--m4/tmpfile.m462
1 files changed, 62 insertions, 0 deletions
diff --git a/m4/tmpfile.m4 b/m4/tmpfile.m4
new file mode 100644
index 0000000..36abd15
--- /dev/null
+++ b/m4/tmpfile.m4
@@ -0,0 +1,62 @@
+# tmpfile.m4 serial 4
+# Copyright (C) 2007, 2009-2022 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], [:])