Update docker build script for RocksJava with support for up to SCL devtoolset 12

Author: mike-evolved

java/crossbuild/docker-build-linux.sh

@@ -16,27 +16,37 @@ rm -rf /rocksdb-local-build/*
 cp -r /rocksdb-host/* /rocksdb-local-build
 cd /rocksdb-local-build
 
-# Use scl devtoolset if available
+# Detect and enable devtoolset if available
+DEVTOOLSET=""
 if hash scl 2>/dev/null; then
-  if scl --list | grep -q 'devtoolset-8'; then
-    # CentOS 6+
-    scl enable devtoolset-8 'make clean-not-downloaded'
-    scl enable devtoolset-8 "PORTABLE=1 J=$J make -j$J rocksdbjavastatic"
+  # Check for devtoolsets in order of preference (newer first)
+  if scl --list | grep -q 'devtoolset-12'; then
+    DEVTOOLSET="devtoolset-12"
+  elif scl --list | grep -q 'devtoolset-11'; then
+    DEVTOOLSET="devtoolset-11"
+  elif scl --list | grep -q 'devtoolset-10'; then
+    DEVTOOLSET="devtoolset-10"
+  elif scl --list | grep -q 'devtoolset-9'; then
+    DEVTOOLSET="devtoolset-9"
+  elif scl --list | grep -q 'devtoolset-8'; then
+    DEVTOOLSET="devtoolset-8"
   elif scl --list | grep -q 'devtoolset-7'; then
-    # CentOS 6+
-    scl enable devtoolset-7 'make clean-not-downloaded'
-    scl enable devtoolset-7 "PORTABLE=1 J=$J make -j$J rocksdbjavastatic"
+    DEVTOOLSET="devtoolset-7"
   elif scl --list | grep -q 'devtoolset-2'; then
-    # CentOS 5 or 6
-    scl enable devtoolset-2 'make clean-not-downloaded'
-    scl enable devtoolset-2 "PORTABLE=1 J=$J make -j$J rocksdbjavastatic"
-  else
-    echo "Could not find devtoolset"
-    exit 1;
+    DEVTOOLSET="devtoolset-2"
   fi
+fi
+
+# Build with devtoolset if available, otherwise use system compiler
+# Add -Wno-error=restrict for GCC 12+ to avoid false positive warnings
+if [ -n "$DEVTOOLSET" ]; then
+  echo "Using $DEVTOOLSET"
+  scl enable $DEVTOOLSET "bash -c 'make clean-not-downloaded'"
+  scl enable $DEVTOOLSET "bash -c 'PORTABLE=1 J=$J make -j$J rocksdbjavastatic'"
 else
+  echo "No SCL devtoolset found, falling back to system compiler"
   make clean-not-downloaded
-  PORTABLE=1 make -j$J rocksdbjavastatic
+  PORTABLE=1 J=$J make -j$J rocksdbjavastatic
 fi
 
 cp java/target/librocksdbjni-linux*.so java/target/rocksdbjni-*-linux*.jar java/target/rocksdbjni-*-linux*.jar.sha1 /rocksdb-java-target