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misc: Updates for gcc7.2 for x86

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GCC 7.2 is much stricter than previous GCC versions. The following changes
are needed:

* There is now a warning if there is an implicit fallthrough between two
  case statments. C++17 adds the [[fallthrough]]; declaration. However,
  to support non C++17 standards (i.e., C++11), we use M5_FALLTHROUGH.
  M5_FALLTHROUGH checks for [[fallthrough]] compliant C++17 compiler and
  if that doesn't exist, it defaults to nothing (no older compilers
  generate warnings).
* The above resulted in a couple of bugs that were found. This is noted
  in the review request on gerrit.
* throw() for dynamic exception specification is deprecated
* There were a couple of new uninitialized variable warnings
* Can no longer perform bitwise operations on a bool.
* Must now include <functional> for std::function
* Compiler bug for void* lambda. Changed to auto as work around. See
  https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82878

Change-Id: I5d4c782a4e133fa4cdb119e35d9aff68c6e2958e
Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
Reviewed-on: https://gem5-review.googlesource.com/5802
Reviewed-by: Gabe Black <gabeblack@google.com>
This commit is contained in:
Jason Lowe-Power
2017-12-13 10:19:04 -08:00
parent f07d5069d8
commit 5c41076bd7
21 changed files with 54 additions and 56 deletions
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42
ext/dnet/ip.h
View File

@@ -428,47 +428,13 @@ inline int
ip_cksum_add(const void *buf, size_t len, int cksum)
{
uint16_t *sp = (uint16_t *)buf;
int n, sn;
int sn;
sn = len / 2;
n = (sn + 15) / 16;
/* XXX - unroll loop using Duff's device. */
switch (sn % 16) {
case 0: do {
cksum += *sp++;
case 15:
cksum += *sp++;
case 14:
cksum += *sp++;
case 13:
cksum += *sp++;
case 12:
cksum += *sp++;
case 11:
cksum += *sp++;
case 10:
cksum += *sp++;
case 9:
cksum += *sp++;
case 8:
cksum += *sp++;
case 7:
cksum += *sp++;
case 6:
cksum += *sp++;
case 5:
cksum += *sp++;
case 4:
cksum += *sp++;
case 3:
cksum += *sp++;
case 2:
cksum += *sp++;
case 1:
cksum += *sp++;
} while (--n > 0);
}
do {
cksum += *sp++;
} while (--sn > 0);
if (len & 1)
cksum += htons(*(u_char *)sp << 8);