Add support for testing on 64-bit big-endian architectures.

In particular add support for s390x but we hope this will work for other 64-bit big-endian architectures.

Run basic unit tests on Travis CI for 390x.

.travis.yml

@@ -60,6 +60,13 @@ jobs:
         - PGB_CI="test --vm=none --param=no-coverage --param=module=command --param=module=storage"
       services:
 
+    # Basic unit tests only. Coverage testing is also disabled to save time.
+    - arch: s390x
+      dist: bionic
+      env:
+        - PGB_CI="test --vm=none --param=no-coverage --param=module=command --param=module=storage"
+      services:
+
 install:
   - umask 0022 && cd ~ && pwd && whoami && umask && groups
   - df -Th && top -bn1

test/src/common/harnessTest.h

@@ -376,4 +376,9 @@ Is this a 64-bit system?  If not then it is 32-bit since 16-bit systems are not
 #define TEST_64BIT()                                                                                                               \
     (sizeof(size_t) == 8)
 
+/***********************************************************************************************************************************
+Is this a big-endian system?
+***********************************************************************************************************************************/
+#define TEST_BIG_ENDIAN() (!*(unsigned char *)&(uint16_t){1})
+
 #endif

test/src/module/command/archivePushTest.c

@@ -264,7 +264,8 @@ testRun(void)
         // Check sha1 checksum against fixed values once to make sure they are not getting munged. After this we'll calculate them
         // directly from the buffers to reduce the cost of maintaining checksums.
         const char *walBuffer1Sha1 = TEST_64BIT() ?
-            "aae7591a1dbc58f21d0d004886075094f622e6dd" : "28a13fd8cf6fcd9f9a8108aed4c8bcc58040863a";
+            (TEST_BIG_ENDIAN() ? "1c5f963d720bb199d7935dbd315447ea2ec3feb2" : "aae7591a1dbc58f21d0d004886075094f622e6dd") :
+            "28a13fd8cf6fcd9f9a8108aed4c8bcc58040863a";
 
         storagePutP(storageNewWriteP(storagePgWrite(), strNew("pg_wal/000000010000000100000001")), walBuffer1);
 

test/src/module/command/backupTest.c

@@ -1487,7 +1487,9 @@ testRun(void)
             "P01   INFO: backup file {[path]}/pg1/postgresql.conf (11B, 100%%) checksum e3db315c260e79211b7b52587123b7aa060f30ab\n"
             "P00   INFO: full backup size = 8KB\n"
             "P00   INFO: new backup label = [FULL-1]",
-            TEST_64BIT() ? "21e2ddc99cdf4cfca272eee4f38891146092e358" : "8bb70506d988a8698d9e8cf90736ada23634571b");
+            TEST_64BIT() ?
+                (TEST_BIG_ENDIAN() ? "749acedef8f8d5fe35fc20c0375657f876ccc38e" : "21e2ddc99cdf4cfca272eee4f38891146092e358") :
+                "8bb70506d988a8698d9e8cf90736ada23634571b");
 
         // Make pg no longer appear to be running
         storageRemoveP(storagePgWrite(), PG_FILE_POSTMASTERPID_STR, .errorOnMissing = true);

test/src/module/postgres/interfaceTest.c

@@ -190,8 +190,8 @@ testRun(void)
         unsigned char page[PG_PAGE_SIZE_DEFAULT];
         memset(page, 0xFF, PG_PAGE_SIZE_DEFAULT);
 
-        TEST_RESULT_UINT(pgPageChecksum(page, 0), 0x0E1C, "check 0xFF filled page, block 0");
+        TEST_RESULT_UINT(pgPageChecksum(page, 0), TEST_BIG_ENDIAN() ? 0xF55E : 0x0E1C, "check 0xFF filled page, block 0");
-        TEST_RESULT_UINT(pgPageChecksum(page, 999), 0x0EC3, "check 0xFF filled page, block 999");
+        TEST_RESULT_UINT(pgPageChecksum(page, 999), TEST_BIG_ENDIAN() ? 0xF1B9 : 0x0EC3, "check 0xFF filled page, block 999");
     }
 
     // *****************************************************************************************************************************