-#ifdef __GLASGOW_HASKELL__
+/* Global variables may not work in other Haskell implementations,
+ * but we need them currently! so the conditional on GLASGOW won't do. */
+#if defined(__GLASGOW_HASKELL__) || !defined(__GLASGOW_HASKELL__)
#define GLOBAL_VAR(name,value,ty) \
name = Util.global (value) :: IORef (ty); \
{-# NOINLINE name #-}
#define GLOBAL_VAR(name,value,ty) \
name = Util.global (value) :: IORef (ty); \
{-# NOINLINE name #-}
#define ASSERT(e) if (not (e)) then (assertPanic __FILE__ __LINE__) else
#define ASSERT2(e,msg) if (not (e)) then (assertPprPanic __FILE__ __LINE__ (msg)) else
#define WARN( e, msg ) (warnPprTrace (e) __FILE__ __LINE__ (msg))
#define ASSERTM(mbool) do { bool <- mbool; ASSERT(bool) return () }
#define ASSERTM2(mbool,msg) do { bool <- mbool; ASSERT2(bool,msg) return () }
#else
#define ASSERT(e) if (not (e)) then (assertPanic __FILE__ __LINE__) else
#define ASSERT2(e,msg) if (not (e)) then (assertPprPanic __FILE__ __LINE__ (msg)) else
#define WARN( e, msg ) (warnPprTrace (e) __FILE__ __LINE__ (msg))
#define ASSERTM(mbool) do { bool <- mbool; ASSERT(bool) return () }
#define ASSERTM2(mbool,msg) do { bool <- mbool; ASSERT2(bool,msg) return () }
#else
-- We have to actually use all the variables we are given or we may get
-- unused variable warnings when DEBUG is off.
#define ASSERT(e) if False && (not (e)) then panic "ASSERT" else
-- We have to actually use all the variables we are given or we may get
-- unused variable warnings when DEBUG is off.
#define ASSERT(e) if False && (not (e)) then panic "ASSERT" else
--- This #ifndef lets us switch off the "import FastString"
--- when compiling FastString itself
-#ifndef COMPILING_FAST_STRING
+-- This conditional lets us switch off the "import FastString"
+-- when compiling FastString itself, or when compiling modules that
+-- don't use it (and would otherwise get warnings, which we treat
+-- as errors). Can we do this more nicely?
+#if !defined(COMPILING_FAST_STRING) && !defined(FAST_STRING_NOT_NEEDED)