make new math code compatible with unused variable warning/error

commit b50d315fd23f0fbc4c11e2583801dd123d933745 introduced
fp_force_eval implemented by default with a dead store to a volatile
variable. unfortunately introduces warnings with -Wunused-variable and
breaks the ability to use -Werror with the default warning options set
by configure when warnings are enabled.

we could just call fp_barrier instead, but that results in a spurious
load after the store due to volatile semantics.

the fix committed here avoids the load. it will still produce warnings
without -Wno-unused-but-set-variable, but that's part of our default
warning profile, and there are already other locations in the source
where an unused variable warning will occur without it.

diff --git a/src/internal/libm.h b/src/internal/libm.h
index 05f14e488d627f3cc8ca922049ac3e78e9914122..b5bd26b8407751e7042f6ad974a79af08226d0f0 100644 (file)
--- a/src/internal/libm.h
+++ b/src/internal/libm.h
@@ -154,7 +154,8 @@ static inline long double fp_barrierl(long double x)
 #define fp_force_evalf fp_force_evalf
 static inline void fp_force_evalf(float x)
 {
-       volatile float y = x;
+       volatile float y;
+       y = x;
 }
 #endif
 
@@ -162,7 +163,8 @@ static inline void fp_force_evalf(float x)
 #define fp_force_eval fp_force_eval
 static inline void fp_force_eval(double x)
 {
-       volatile double y = x;
+       volatile double y;
+       y = x;
 }
 #endif
 
@@ -170,7 +172,8 @@ static inline void fp_force_eval(double x)
 #define fp_force_evall fp_force_evall
 static inline void fp_force_evall(long double x)
 {
-       volatile long double y = x;
+       volatile long double y;
+       y = x;
 }
 #endif