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-rw-r--r--m4/sh-filename.m424
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diff --git a/m4/sh-filename.m4 b/m4/sh-filename.m4
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+# sh-filename.m4 serial 3
+dnl Copyright (C) 2018-2020 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.
+
+dnl From Bruno Haible.
+
+AC_DEFUN([gl_SH_FILENAME],
+[
+ AH_VERBATIM([SH_FILENAME],
+[/* File name of the Bourne shell. */
+#if (defined _WIN32 && !defined __CYGWIN__) || defined __CYGWIN__ || defined __ANDROID__
+/* Omit the directory part because
+ - For native Windows programs in a Cygwin environment, the Cygwin mounts
+ are not visible.
+ - For 32-bit Cygwin programs in a 64-bit Cygwin environment, the Cygwin
+ mounts are not visible.
+ - On Android, /bin/sh does not exist. It's /system/bin/sh instead. */
+# define BOURNE_SHELL "sh"
+#else
+# define BOURNE_SHELL "/bin/sh"
+#endif])
+])