On 1/18/19 5:24 AM, Rainer Orth wrote:
Hi Christophe,
After your commit (r268037), I'm seeing excess errors on some arm targets:
FAIL: c-c++-common/Wrestrict.c -Wc++-compat (test for excess errors)
Excess errors:
/gcc/testsuite/c-c++-common/Wrestrict.c:195:3: warning: 'memcpy'
accessing 4 bytes at offsets [2, 3] and 0 overlaps between 1 and 2
bytes at offset [2, 3] [-Wrestrict]
/gcc/testsuite/c-c++-common/Wrestrict.c:202:3: warning: 'memcpy'
accessing 4 bytes at offsets [2, 3] and 0 overlaps between 1 and 2
bytes at offset [2, 3] [-Wrestrict]
/gcc/testsuite/c-c++-common/Wrestrict.c:207:3: warning: 'memcpy'
accessing 4 bytes at offsets [2, 3] and 0 overlaps between 1 and 2
bytes at offset [2, 3] [-Wrestrict]
I'm seeing the same on sparc-sun-solaris2.*, both 32 and 64-bit.
Test results for x86_64-w64-mingw32 and ia64-suse-linux-gnu show the same
failure.
Besides (and probably caused by the same revision), I now get
+XPASS: c-c++-common/Warray-bounds-3.c -std=gnu++14 bug (test for warnings,
line 161)
+XPASS: c-c++-common/Warray-bounds-3.c -std=gnu++17 bug (test for warnings,
line 161)
+XPASS: c-c++-common/Warray-bounds-3.c -std=gnu++98 bug (test for warnings,
line 161)
+XPASS: c-c++-common/Warray-bounds-3.c -Wc++-compat bug (test for warnings,
line 161)
which is also seen on ia64-suse-linux-gnu.
I think this is the same problem as the one on arm. The bigger patch
I posted should take care of it as well.
Martin
Index: gcc/testsuite/c-c++-common/Warray-bounds-3.c
===================================================================
--- gcc/testsuite/c-c++-common/Warray-bounds-3.c (revision 268082)
+++ gcc/testsuite/c-c++-common/Warray-bounds-3.c (working copy)
@@ -158,7 +158,7 @@ void test_memcpy_overflow (char *d, const char *s,
but known access size is detected. This works except with small
sizes that are powers of 2 due to bug . */
T (char, 1, arr + SR (DIFF_MAX - 1, DIFF_MAX), s, 1);
- T (char, 1, arr + SR (DIFF_MAX - 1, DIFF_MAX), s, 2); /* {
dg-warning "pointer overflow between offset \\\[\[0-9\]+, \[0-9\]+] and
size 2 accessing array " "bug " { xfail *-*-* } } */
+ T (char, 1, arr + SR (DIFF_MAX - 1, DIFF_MAX), s, 2); /* {
dg-warning "pointer overflow between offset \\\[\[0-9\]+, \[0-9\]+] and
size 2 accessing array " "bug " { xfail fold_memcpy_2 } } */
T (char, 1, arr + SR (DIFF_MAX - 2, DIFF_MAX), s, 3); /* {
dg-warning "pointer overflow between offset \\\[\[0-9\]+, \[0-9\]+] and
size 3 accessing array " "memcpy" } */
T (char, 1, arr + SR (DIFF_MAX - 4, DIFF_MAX), s, 5); /* {
dg-warning "pointer overflow between offset \\\[\[0-9\]+, \[0-9\]+] and
size 5 accessing array " "memcpy" } */
}
