The PR50078+PR51466 fix, r182157 on 4.6 branch, caused a test suite regression on arm-linux-gnueabi: +FAIL: gcc.dg/pr45819.c (test for excess errors) because the compiler now emits the following warning: pr45819.c: In function 'ehci_hub_control': pr45819.c:16:10: warning: mis-aligned access used for structure member [-fstrict-volatile-bitfields] pr45819.c:16:10: note: when a volatile object spans multiple type-sized locations, the compiler must choose between using a single mis-aligned access to preserve the volatility, or using multiple aligned accesses to avoid runtime faults; this code may fail at runtime if the hardware does not allow this access I believe the warning is correct, so perhaps the warning should just be suppressed in pr45819.c with -w. gcc-4.7-20111210 has the same issue.
Created attachment 26052 [details] gcc47-pr51511.patch Yeah, I agree.
Author: jakub Date: Mon Dec 12 16:48:46 2011 New Revision: 182247 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=182247 Log: PR testsuite/51511 * gcc.dg/pr45819.c: Add -w to dg-options. Modified: trunk/gcc/testsuite/ChangeLog trunk/gcc/testsuite/gcc.dg/pr45819.c
Author: jakub Date: Mon Dec 12 19:44:22 2011 New Revision: 182261 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=182261 Log: PR testsuite/51511 * gcc.dg/pr45819.c: Add -w to dg-options. Modified: branches/gcc-4_6-branch/gcc/testsuite/ChangeLog branches/gcc-4_6-branch/gcc/testsuite/gcc.dg/pr45819.c
Fixed.