[Local GC] Provide an implementation of GCToOSInterface for Unix-like platforms (#8976)

* Add way to build with FEATURE_STANDALONE_GC from build.sh
* Make CMake changes to build the GC 'PAL' as its own build target (to avoid -nostdinc).
In addition, introduce a "GC PAL" that provides an implementation of
GCToOSInterface on Unix-like platforms, for use with
FEATURE_STANDALONE_GC.

1 files changed, 4 insertions, 1 deletions

diff --git a/build.sh b/build.sh
index 4302407292..8d03121479 100755
--- a/build.sh
+++ b/build.sh
@@ -47,6 +47,7 @@ usage()
     echo "skipgenerateversion - disable version generation even if MSBuild is supported."
     echo "cmakeargs - user-settable additional arguments passed to CMake."
     echo "bindir - output directory (defaults to $__ProjectRoot/bin)"
+    echo "buildstandalonegc - builds the GC in a standalone mode. Can't be used with \"cmakeargs\"."
 
     exit 1
 }
@@ -724,7 +725,9 @@ while :; do
                 exit 1
             fi
             ;;
-
+        buildstandalonegc)
+            __cmakeargs="-DFEATURE_STANDALONE_GC=1"
+            ;;
         *)
             __UnprocessedBuildArgs="$__UnprocessedBuildArgs $1"
             ;;