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Port Qnil==0 XUNTAG to clang
authorPaul Eggert <eggert@cs.ucla.edu>
Thu, 8 Jan 2015 07:02:01 +0000 (23:02 -0800)
committerPaul Eggert <eggert@cs.ucla.edu>
Thu, 8 Jan 2015 07:02:27 +0000 (23:02 -0800)
commitf6a27d26dccdcc121bebc96fbf41f656fbf13138
tree344d746bc2738cbf6a19bc378236b3a6810febc2tree | snapshot
parent9f654763f2223ce9f3317b44a3d1a8ac2c8bb832commit | diff
Port Qnil==0 XUNTAG to clang

clang has undefined behavior if the program subtracts an integer
from (char *) 0.  Problem reported by YAMAMOTO Mitsuharu in:
http://lists.gnu.org/archive/html/emacs-devel/2015-01/msg00132.html
* lisp.h (lisp_h_XUNTAG) [USE_LSB_TAG]:
(XUNTAG) [!USE_LSB_TAG]: Port to clang 3.5.0.
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