[Bug middle-end/45017] miscompile with bitfield and optimization

[borntraeger at de dot ibm dot com]

------- Comment #11 from borntraeger at de dot ibm dot com  2010-07-25 16:54 
-------
Something like the following should do the trick.
Is endian.h available on all supported platforms?


*** gcc.c-torture/execute/pr45017.c.orig
--- gcc.c-torture/execute/pr45017.c
***************
*** 1,9 ****
--- 1,17 ----
+ #include <endian.h>
+ 
  int tester(char *bytes)
  {
    union {
        struct {
+ #  if __BYTE_ORDER == __BIG_ENDIAN
+         unsigned int r2:4;
+         unsigned int r1:4;
+ #  endif
+ #  if __BYTE_ORDER == __LITTLE_ENDIAN
          unsigned int r1:4;
          unsigned int r2:4;
+ #  endif
        } fmt;
        char value[1];
    } ovl;


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45017