Improvements in GCC 4.3.3 R1 vs. R0 (unpatched):
------------------------------------------------
Backport from work on SVN trunk. No PRs yet...
Summary:
* g++.dg/compat/struct-layout-1, gcc.dg/compat/struct-layout-1, objc.dg/gnu-encoding/struct-layout-encoding-1:
  Remove usage of snprintf, it's unportable and we cannot use libiberty for other reasons.
* Implement #pragma(push,pop) in addition to GNU __attribute__((push,pop))
* Disable SUPPORTS_INIT_PRIORITY when using IRIX ld, this requires GNU ld.
* g++.dg/warn/miss-format-1.C: Like Solaris 2.[5-8]: we don't have vscanf()


Regressions in R2 vs. R1: 
none.

Testcases that fail in R1, but pass in R2:
-WARNING: Could not compile g++.dg/compat/struct-layout-1 generator
-FAIL: g++.dg/cpp/_Pragma1.C (test for excess errors)
-FAIL: g++.dg/warn/miss-format-1.C scanf attribute warning (test for warnings, line 24)
-FAIL: g++.dg/warn/miss-format-1.C (test for excess errors)
-FAIL: g++.dg/special/conpr-1.C execution test
-FAIL: g++.dg/special/conpr-2.C execution test
-FAIL: g++.dg/special/conpr-3.C execution test
-FAIL: g++.dg/special/conpr-4.C execution test
-FAIL: g++.dg/special/initp1.C execution test
-FAIL: g++.dg/special/initpri1.C execution test

-WARNING: Could not compile gcc.dg/compat/struct-layout-1 generator
-FAIL: gcc.dg/cpp/_Pragma6.c (test for excess errors)
-FAIL: gcc.dg/initpri1.c execution test
 
-WARNING: Could not compile objc.dg/gnu-encoding/struct-layout-encoding-1 generator