# HG changeset patch
# Parent  75f82108f6d11edd2b8a05a2198253152ed26f85

diff --git a/gcc/jit/jit-tempdir.c b/gcc/jit/jit-tempdir.c
--- a/gcc/jit/jit-tempdir.c
+++ b/gcc/jit/jit-tempdir.c
@@ -49,11 +49,30 @@ make_tempdir_path_template ()
   gcc_assert (tmpdir_buf);
 
   tmpdir_len = strlen (tmpdir_buf);
   /* tmpdir_buf should now have a dir separator as the final byte.  */
   gcc_assert (tmpdir_len > 0);
-  gcc_assert (tmpdir_buf[tmpdir_len - 1] == DIR_SEPARATOR);
+# ifdef _WIN32
+  /* FIXME: the following assertion could be suicidal on Windows;
+   * there are *two* valid directory separator characters, but the
+   * assertion stipulates that only DIR_SEPARATOR, (with its unique
+   * value of '/'), is valid in this context.  Thus, we must ensure
+   * that the final byte is tested as being equal to DIR_SEPARATOR,
+   * in the case, (expected from choose_tmpdir), where it is the
+   * equally valid '\\', when the assertion is verified.
+   */
+  char tmpdir_buf_final = tmpdir_buf[tmpdir_len - 1];
+  if (tmpdir_buf_final == '/' || tmpdir_buf_final == '\\')
+    tmpdir_buf_final = DIR_SEPARATOR;
+# else
+  /* On any platform, other than Windows, we assume that there
+   * really is only one valid DIR_SEPARATOR character; thus, we
+   * may simply verify tmpdir_buf's final character, in place.
+   */
+# define tmpdir_buf_final  tmpdir_buf[tmpdir_len - 1]
+# endif
+  gcc_assert (tmpdir_buf_final == DIR_SEPARATOR);
 
   file_template_buf = "libgccjit-XXXXXX";
   file_template_len = strlen (file_template_buf);
 
   result = XNEWVEC (char, tmpdir_len + file_template_len + 1);