Use C99's INFINITY and NAN macros

* lread.c: Include <math.h>.
(string_to_number): Use INFINITY and NAN rather than rolling our own.
This avoids some runtime diagnostics when building with
gcc -fsanitize=undefined.

1 files changed, 6 insertions, 0 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 3b2c9a6777f..381ae6b0989 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,5 +1,11 @@
 2015-02-09  Paul Eggert  <eggert@cs.ucla.edu>
 
+        Use C99's INFINITY and NAN macros
+        * lread.c: Include <math.h>.
+        (string_to_number): Use INFINITY and NAN rather than rolling our own.
+        This avoids some runtime diagnostics when building with
+        gcc -fsanitize=undefined.
+
         Fix bidi_explicit_dir_char undefined behavior
         * bidi.c (bidi_explicit_dir_char): Avoid subscript error when
         argument is BIDI_EOB.  This can happen in bidi_level_of_next_char.