krata: rework cross-compilation

hack/build/target.sh

@@ -1,29 +1,57 @@
 #!/bin/sh
 set -e
 
-if [ -z "${RUST_LIBC}" ]
+if [ -z "${TARGET_LIBC}" ] || [ "${KRATA_TARGET_IGNORE_LIBC}" = "1" ]
 then
-  RUST_LIBC="gnu"
+  TARGET_LIBC="gnu"
+fi
+
+if [ -z "${TARGET_ARCH}" ]
+then
+  TARGET_ARCH="$(uname -m)"
 fi
 
 if [ -z "${RUST_TARGET}" ]
 then
-  HOST_ARCH="$(uname -m)"
-  if [ "${HOST_ARCH}" = "x86_64" ]
+  if [ "${TARGET_ARCH}" = "x86_64" ]
   then
-    RUST_TARGET="x86_64-unknown-linux-${RUST_LIBC}"
+    RUST_TARGET="x86_64-unknown-linux-${TARGET_LIBC}"
   fi
 
-  if [ "${HOST_ARCH}" = "aarch64" ]
+  if [ "${TARGET_ARCH}" = "aarch64" ]
   then
-    RUST_TARGET="aarch64-unknown-linux-${RUST_LIBC}"
+    RUST_TARGET="aarch64-unknown-linux-${TARGET_LIBC}"
   fi
 fi
 
-if [ -z "${RUST_TARGET}" ]
+if [ -z "${C_TARGET}" ]
 then
-  echo "ERROR: Unable to determine RUST_TARGET, your architecture may not be supported by krata." > /dev/stderr
-  exit 1
+  if [ "${TARGET_ARCH}" = "x86_64" ]
+  then
+    C_TARGET="x86_64-linux-${TARGET_LIBC}"
+  fi
+
+  if [ "${TARGET_ARCH}" = "aarch64" ]
+  then
+    C_TARGET="aarch64-linux-${TARGET_LIBC}"
+  fi
 fi
 
-echo "${RUST_TARGET}"
+if [ "${KRATA_TARGET_C_MODE}" = "1" ]
+then
+  if [ -z "${C_TARGET}" ]
+  then
+    echo "ERROR: Unable to determine C_TARGET, your architecture may not be supported by krata." > /dev/stderr
+    exit 1
+  fi
+
+  echo "${C_TARGET}"
+else
+  if [ -z "${RUST_TARGET}" ]
+  then
+    echo "ERROR: Unable to determine RUST_TARGET, your architecture may not be supported by krata." > /dev/stderr
+    exit 1
+  fi
+
+  echo "${RUST_TARGET}"
+fi