fix(build): do not patch/rebuild tensorrt if not needed

CMakeLists.txt

@@ -966,8 +966,9 @@ if (USE_TENSORRT)
       GIT_REPOSITORY https://github.com/NVIDIA/TensorRT.git
       GIT_TAG ${TENSORRT_VERSION}
       GIT_CONFIG advice.detachedHead=false
-      PATCH_COMMAND git reset --hard && git submodule foreach --recursive git reset --hard && git apply ${TRT_PATCHES}
-      BUILD_COMMAND test -f ${TENSORRT_COMPLETE} || cmake ${TRT_FLAGS}
+      PATCH_COMMAND sh ${CMAKE_SOURCE_DIR}/cmake/patch_external.sh TENSORRT ${CMAKE_BINARY_DIR}/tensorrt-oss/src/tensorrt-oss-stamp tensorrt-oss-download tensorrt-oss-patch ${CMAKE_BINARY_DIR}/tensorrt-oss/src/tensorrt-oss ${TRT_PATCHES}
+      CONFIGURE_COMMAND ""
+      BUILD_COMMAND sh ${CMAKE_SOURCE_DIR}/cmake/build_external.sh TENSORRT ${CMAKE_BINARY_DIR}/tensorrt-oss ${TENSORRT_COMPLETE} src/tensorrt-oss src/tensorrt-oss-build ${N} ${CMAKE_COMMAND} ${TRT_FLAGS}
       INSTALL_COMMAND ""
     )
 

cmake/build_external.sh

@@ -0,0 +1,20 @@
+NAME=$1
+PREFIX=$2
+COMPLETION_STAMP=$3
+SOURCE_POSTFIX=$4
+BUILD_POSTFIX=$5
+J=$6
+CMAKE_COMMAND=$7
+shift 7
+ARGS=$@
+[ -f "$COMPLETION_STAMP" ] && echo "$NAME" already built, not rebuilding && exit 0
+echo "External build of : $NAME"
+echo "with prefix       : $PREFIX"
+echo "completion stamp  : $COMPLETION_STAMP"
+echo "source postfix    : $SOURCE_POSTFIX"
+echo "build postfix     : $BUILD_POSTFIX"
+echo "-j                : $J"
+echo "CMAKE_COMMAND     : $CMAKE_COMMAND"
+echo "additional args   : $ARGS"
+$CMAKE_COMMAND -S $PREFIX/$SOURCE_POSTFIX -B $PREFIX/$BUILD_POSTFIX $ARGS
+make -C $PREFIX/$BUILD_POSTFIX -j$J

cmake/patch_external.sh

@@ -0,0 +1,16 @@
+NAME=$1
+PREFIX=$2
+DOWNLOAD_STAMP=$3
+PATCH_STAMP=$4
+SOURCE_LOCATION=$5
+shift 5
+PATCHES=$@
+[ -f "$PREFIX/$DOWNLOAD_STAMP" ] && [ -f "$PREFIX//$PATCH_STAMP" ] && [ $(( $(stat -c %Y "$PREFIX/$PATCH_STAMP") - $(stat -c %Y "$PREFIX/$DOWNLOAD_STAMP")  )) -ge 0 ] && echo "$NAME" already patched, skipping && exit 0
+echo "External patch of : $NAME"
+echo "with prefix       : $PREFIX"
+echo "download stamp    : $DOWNLOAD_STAMP"
+echo "patch stamp       : $PATCH_STAMP"
+echo "source location   : $SOURCE_LOCATION"
+echo "patches           : $PATCHES"
+cd $SOURCE_LOCATION
+git apply $PATCHES