Disable -Wcast-align when building the rts

This flag seems buggy on GCC 4.1.2, which is the only GCC version we
have that can bootstrap the SPARC build. We end up with lots of supurious
warnings of the form "cast increases required alignment of target type".
Some legitimate warnings can be fixed by adding an intermediate cast to
(void*), but we get others in rts/sm/GCUtils.c concerning the gct var
that look innocuous to me. We could enable this again once we deprecate
support for registerised builds on this arch.

diff --git a/rts/ghc.mk b/rts/ghc.mk
index 7ae3f84..b238728 100644 (file)
--- a/rts/ghc.mk
+++ b/rts/ghc.mk
@@ -207,7 +207,6 @@ WARNING_OPTS += -Winline
 WARNING_OPTS += -Waggregate-return
 WARNING_OPTS += -Wpointer-arith
 WARNING_OPTS += -Wmissing-noreturn
-WARNING_OPTS += -Wcast-align
 WARNING_OPTS += -Wnested-externs
 WARNING_OPTS += -Wredundant-decls 
 
@@ -217,6 +216,15 @@ WARNING_OPTS += -Wredundant-decls
 #WARNING_OPTS += -Wshadow
 #WARNING_OPTS += -Wcast-qual
 
+# This one seems buggy on GCC 4.1.2, which is the only GCC version we 
+# have that can bootstrap the SPARC build. We end up with lots of supurious
+# warnings of the form "cast increases required alignment of target type".
+# Some legitimate warnings can be fixed by adding an intermediate cast to
+# (void*), but we get others in rts/sm/GCUtils.c concerning the gct var
+# that look innocuous to me. We could enable this again once we deprecate
+# support for registerised builds on this arch. -- BL 2010/02/03
+# WARNING_OPTS += -Wcast-align
+
 STANDARD_OPTS += -Iincludes -Irts
 # COMPILING_RTS is only used when building Win32 DLL support.
 STANDARD_OPTS += -DCOMPILING_RTS