Suppress implicit-conversion warnings seen with newer clang versions.

We were assigning values near 255 through "char *" pointers.  On machines
where char is signed, that's not entirely kosher, and it's reasonable
for compilers to warn about it.

A better solution would be to change the pointer type to "unsigned char *",
but that would be vastly more invasive.  For the moment, let's just apply
this simple backpatchable solution.

Aleksander Alekseev

Discussion: https://postgr.es/m/20170220141239.GD12278@e733.localdomain
Discussion: https://postgr.es/m/2839.1490714708@sss.pgh.pa.us

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index 61ca81d1d2437328deec23462651677a87c786d9..25fa5443de4a5d2bbeefff6785071b1b91ffa2de 100644 (file)
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -5044,7 +5044,7 @@ BootStrapXLOG(void)
        record->xl_rmid = RM_XLOG_ID;
        recptr += SizeOfXLogRecord;
        /* fill the XLogRecordDataHeaderShort struct */
-       *(recptr++) = XLR_BLOCK_ID_DATA_SHORT;
+       *(recptr++) = (char) XLR_BLOCK_ID_DATA_SHORT;
        *(recptr++) = sizeof(checkPoint);
        memcpy(recptr, &checkPoint, sizeof(checkPoint));
        recptr += sizeof(checkPoint);

diff --git a/src/backend/access/transam/xloginsert.c b/src/backend/access/transam/xloginsert.c
index 03b05f937f024db731dad68fbabcc50ed4a2d669..a3bd0b7f51a064557230f12338b2c73fc49cacb0 100644 (file)
--- a/src/backend/access/transam/xloginsert.c
+++ b/src/backend/access/transam/xloginsert.c
@@ -739,7 +739,7 @@ XLogRecordAssemble(RmgrId rmid, uint8 info,
        if ((curinsert_flags & XLOG_INCLUDE_ORIGIN) &&
                replorigin_session_origin != InvalidRepOriginId)
        {
-               *(scratch++) = XLR_BLOCK_ID_ORIGIN;
+               *(scratch++) = (char) XLR_BLOCK_ID_ORIGIN;
                memcpy(scratch, &replorigin_session_origin, sizeof(replorigin_session_origin));
                scratch += sizeof(replorigin_session_origin);
        }
@@ -749,13 +749,13 @@ XLogRecordAssemble(RmgrId rmid, uint8 info,
        {
                if (mainrdata_len > 255)
                {
-                       *(scratch++) = XLR_BLOCK_ID_DATA_LONG;
+                       *(scratch++) = (char) XLR_BLOCK_ID_DATA_LONG;
                        memcpy(scratch, &mainrdata_len, sizeof(uint32));
                        scratch += sizeof(uint32);
                }
                else
                {
-                       *(scratch++) = XLR_BLOCK_ID_DATA_SHORT;
+                       *(scratch++) = (char) XLR_BLOCK_ID_DATA_SHORT;
                        *(scratch++) = (uint8) mainrdata_len;
                }
                rdt_datas_last->next = mainrdata_head;

diff --git a/src/bin/pg_resetwal/pg_resetwal.c b/src/bin/pg_resetwal/pg_resetwal.c
index 27bd9b04e7c8fea31fec828cd8e577f26bc5fb7a..bcb9ed938f5d73767d41e0e8cf0da0340a2b09e8 100644 (file)
--- a/src/bin/pg_resetwal/pg_resetwal.c
+++ b/src/bin/pg_resetwal/pg_resetwal.c
@@ -1095,7 +1095,7 @@ WriteEmptyXLOG(void)
        record->xl_rmid = RM_XLOG_ID;
 
        recptr += SizeOfXLogRecord;
-       *(recptr++) = XLR_BLOCK_ID_DATA_SHORT;
+       *(recptr++) = (char) XLR_BLOCK_ID_DATA_SHORT;
        *(recptr++) = sizeof(CheckPoint);
        memcpy(recptr, &ControlFile.checkPointCopy,
                   sizeof(CheckPoint));