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| author | Andres Freund <andres@anarazel.de> | 2023-03-16 14:08:44 -0700 |
|---|---|---|
| committer | Andres Freund <andres@anarazel.de> | 2023-03-16 14:48:46 -0700 |
| commit | a7a92738ffce35b480d20965ad95317729ae96a2 (patch) | |
| tree | c842a434fdc213fabc33d4f968ab1e3c2dc913a9 | |
| parent | 00fc4b3a31010033e8b1a964c90a7a30b8d6a7d7 (diff) | |
| download | postgresql-a7a92738ffce35b480d20965ad95317729ae96a2.tar.gz postgresql-a7a92738ffce35b480d20965ad95317729ae96a2.zip | |
Work around spurious compiler warning in inet operators
gcc 12+ has complaints like the following:
../../../../../pgsql/src/backend/utils/adt/network.c: In function 'inetnot':
../../../../../pgsql/src/backend/utils/adt/network.c:1893:34: warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]
1893 | pdst[nb] = ~pip[nb];
| ~~~~~~~~~^~~~~~~~~~
../../../../../pgsql/src/include/utils/inet.h:27:23: note: at offset -1 into destination object 'ipaddr' of size 16
27 | unsigned char ipaddr[16]; /* up to 128 bits of address */
| ^~~~~~
../../../../../pgsql/src/include/utils/inet.h:27:23: note: at offset -1 into destination object 'ipaddr' of size 16
This is due to a compiler bug:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104986
It has been a year since the bug has been reported without getting fixed. As
the warnings are verbose and use of gcc 12 is becoming more common, it seems
worth working around the bug. Particularly because a simple reformulation of
the loop condition fixes the issue and isn't any less readable.
Author: Tom Lane <tgl@sss.pgh.pa.us>
Author: Andres Freund <andres@anarazel.de>
Discussion: https://postgr.es/m/144536.1648326206@sss.pgh.pa.us
Backpatch: 11-
| -rw-r--r-- | src/backend/utils/adt/network.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/src/backend/utils/adt/network.c b/src/backend/utils/adt/network.c index 0ab54316f8e..60c2b761751 100644 --- a/src/backend/utils/adt/network.c +++ b/src/backend/utils/adt/network.c @@ -1889,7 +1889,7 @@ inetnot(PG_FUNCTION_ARGS) unsigned char *pip = ip_addr(ip); unsigned char *pdst = ip_addr(dst); - while (nb-- > 0) + while (--nb >= 0) pdst[nb] = ~pip[nb]; } ip_bits(dst) = ip_bits(ip); @@ -1921,7 +1921,7 @@ inetand(PG_FUNCTION_ARGS) unsigned char *pip2 = ip_addr(ip2); unsigned char *pdst = ip_addr(dst); - while (nb-- > 0) + while (--nb >= 0) pdst[nb] = pip[nb] & pip2[nb]; } ip_bits(dst) = Max(ip_bits(ip), ip_bits(ip2)); @@ -1953,7 +1953,7 @@ inetor(PG_FUNCTION_ARGS) unsigned char *pip2 = ip_addr(ip2); unsigned char *pdst = ip_addr(dst); - while (nb-- > 0) + while (--nb >= 0) pdst[nb] = pip[nb] | pip2[nb]; } ip_bits(dst) = Max(ip_bits(ip), ip_bits(ip2)); @@ -1978,7 +1978,7 @@ internal_inetpl(inet *ip, int64 addend) unsigned char *pdst = ip_addr(dst); int carry = 0; - while (nb-- > 0) + while (--nb >= 0) { carry = pip[nb] + (int) (addend & 0xFF) + carry; pdst[nb] = (unsigned char) (carry & 0xFF); @@ -2062,7 +2062,7 @@ inetmi(PG_FUNCTION_ARGS) unsigned char *pip2 = ip_addr(ip2); int carry = 1; - while (nb-- > 0) + while (--nb >= 0) { int lobyte; |