gcc 4 does some overzealous constant folding, and since it doesn't

support FENV_ACCESS, that was causing this test to fail. Use a volatile
to avoid the constant folding.

tools/regression/lib/msun/test-lround.c

@@ -37,9 +37,14 @@ __FBSDID("$FreeBSD$");
 #include <math.h>
 #include <stdio.h>
 
+/*
+ * XXX The volatile here is to avoid gcc's bogus constant folding and work
+ *     around the lack of support for the FENV_ACCESS pragma.
+ */
 #define	test(func, x, result, excepts)	do {				\
+	volatile double _d = x;						\
 	assert(feclearexcept(FE_ALL_EXCEPT) == 0);			\
-	assert((func)(x) == (result) || fetestexcept(FE_INVALID));	\
+	assert((func)(_d) == (result) || fetestexcept(FE_INVALID));	\
 	assert(fetestexcept(FE_ALL_EXCEPT) == (excepts));		\
 } while (0)