Re: [Chicken-users] GCC, dereferencing type-punned pointer...

[felix]

On Fri, 05 Sep 2003 23:49:40 +0200, Johannes Groedem <address@hidden> 
wrote:

> Hi,
>
> I'm getting hundreds (thousands?) of these warnings from GCC (3.3.2
> 20030831 (Debian prerelease)):
>
> warning: dereferencing type-punned pointer will break
> strict-aliasing rules
>
> I'm just wondering whether I can safely ignore them, or whether they
> are significant.  This is an x86-target, by the way.
>
> CFLAGS = -O3 -fomit-frame-pointer -Wall -Wno-unused -Wno-uninitialized
> -DHAVE_ALLOCA_H -fstrict-aliasing
>
> make test passes, and it appears to work fine.

You can patch configure.in the following way:

--- configure.in2003-08-30 18:10:34.000000000 +0200
+++ xxx2003-09-07 09:20:44.000000000 +0200
@@ -140,7 +140,7 @@
case "$CC" in
  *gcc*)
  if test "-g -O2" = "$CFLAGS"; then
-    CFLAGS="-O3 -fomit-frame-pointer -Wall -Wno-unused -Wno-uninitialized"
+    CFLAGS="-O3 -fomit-frame-pointer -Wall -Wno-unused -Wno-uninitialized - 
Wno-strict-aliasing"
    if test -n "$HAVE_ALLOCA_H"; then
      CFLAGS="$CFLAGS -DHAVE_ALLOCA_H"
    fi

AFAIK -fstrict-aliasing works fine with the code generated by chicken.


cheers,
felix