X-Git-Url: https://erislabs.net/gitweb/?a=blobdiff_plain;ds=sidebyside;f=m4%2Fstdbool.m4;h=dcb57935395072524d674e324aa33fa182540f77;hb=e282c7cfcac28d1791f5e60f1b42469e0f021fad;hp=922a00258ee03299cb8cc9463d7c37e88a6cc7b1;hpb=b153ee54f12579c15cb3e8211da8001dfdd7cd0f;p=gnulib.git

diff --git a/m4/stdbool.m4 b/m4/stdbool.m4
index 922a00258..dcb579353 100644
--- a/m4/stdbool.m4
+++ b/m4/stdbool.m4
@@ -76,7 +76,8 @@ AC_DEFUN([AC_HEADER_STDBOOL],
 	  char p[-1 - (_Bool) 0 < 0 && -1 - (bool) 0 < 0 ? 1 : -1];
 	],
 	[
-	  return (!a + !b + !c + !d + !e + !f + !g + !h + !i + !j + !k + !l
+	  /* Refer to every declared value, to avoid compiler optimizations.  */
+	  return (!a + !b + !c + !d + !e + !f + !g + !h + !i + !!j + !k + !!l
 		  + !m + !n + !o + !p);
 	],
 	[ac_cv_header_stdbool_h=yes],