* pack.c (pack_unpack, AVOID_CC_BUG): Very ugly workaround for

optimization bug of Oracle Solaris Studio 12.4 on Solaris
  with -xO4 optimization option. [Bug #11684]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52559 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,9 @@
+Sat Nov 14 01:53:52 2015  Naohisa Goto  <ngotogenome@gmail.com>
+
+	* pack.c (pack_unpack, AVOID_CC_BUG): Very ugly workaround for
+	  optimization bug of Oracle Solaris Studio 12.4 on Solaris
+	  with -xO4 optimization option. [Bug #11684]
+
 Fri Nov 13 23:00:23 2015  Hiroshi Shirosaki  <h.shirosaki@gmail.com>
 
 	* configure.in: unset LD_PRELOAD on mingw. msys2 child processes

pack.c

@@ -1100,6 +1100,15 @@ hex2num(char c)
 	rb_ary_store(ary, RARRAY_LEN(ary)+tmp_len-1, Qnil); \
 } while (0)
 
+/* Workaround for Oracle Solaris Studio 12.4 C compiler optimization bug
+ * with "-xO4" optimization option.
+ */
+#if defined(__SUNPRO_C) && __SUNPRO_C == 0x5130
+# define AVOID_CC_BUG volatile
+#else
+# define AVOID_CC_BUG
+#endif
+
 static VALUE
 infected_str_new(const char *ptr, long len, VALUE str)
 {
@@ -1231,7 +1240,8 @@ pack_unpack(VALUE str, VALUE fmt)
     char *p, *pend;
     VALUE ary;
     char type;
-    long len, tmp_len;
+    long len;
+    AVOID_CC_BUG long tmp_len;
     int star;
 #ifdef NATINT_PACK
     int natint;			/* native integer */