X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=rts%2FMakefile;h=65c2c22cdf32fe9374936ee0716a5627cb883ca7;hb=73566e25d75588185b0581722406da5c48965c51;hp=b1111a027fba4ac26752d31a202153a8146092e2;hpb=b1953bbb1ed3cb16497e5447db7487f0c2d9e41a;p=ghc-hetmet.git

diff --git a/rts/Makefile b/rts/Makefile
index b1111a0..65c2c22 100644
--- a/rts/Makefile
+++ b/rts/Makefile
@@ -315,10 +315,15 @@ SRC_HC_OPTS += -optc-fno-stack-protector
 endif
 
 # -O3 helps unroll some loops (especially in copy() with a constant argument).
-# -fno-strict-aliasing is a hack because we often mix StgPtr and StgClosure pointers
-# to the same object, and gcc will assume these don't alias.  eg. it happens in
-# copy() with gcc 3.4.3, the upd_evacee() assigments get moved before the object copy.
-GC_HC_OPTS += -optc-O3 -optc-fno-strict-aliasing
+GC_HC_OPTS += -optc-O3
+
+# -fno-strict-aliasing is required for the runtime, because we often
+# use a variety of types to represent closure pointers (StgPtr,
+# StgClosure, StgMVar, etc.), and without -fno-strict-aliasing gcc is
+# allowed to assume that these pointers do not alias.  eg. without
+# this flag we get problems in GC.c:copy() with gcc 3.4.3, the
+# upd_evacee() assigments get moved before the object copy.
+SRC_CC_OPTS += -fno-strict-aliasing
 
 # Cmm must be compiled via-C for now, because the NCG can't handle loops
 SRC_HC_OPTS += -fvia-C