echo >&2 "***"
}
+# Print an explanation about the fact that the script is meant to be called from Kbuild.
+print_kbuild_explanation()
+{
+ echo >&2 "***"
+ echo >&2 "*** This script is intended to be called from Kbuild."
+ echo >&2 "*** Please use the 'rustavailable' target to call it instead."
+ echo >&2 "*** Otherwise, the results may not be meaningful."
+ exit 1
+}
+
# If the script fails for any reason, or if there was any warning, then
# print a reference to the documentation on exit.
warning=0
trap 'if [ $? -ne 0 ] || [ $warning -ne 0 ]; then print_docs_reference; fi' EXIT
+# Check that the expected environment variables are set.
+if [ -z "${RUSTC+x}" ]; then
+ echo >&2 "***"
+ echo >&2 "*** Environment variable 'RUSTC' is not set."
+ print_kbuild_explanation
+fi
+
+if [ -z "${BINDGEN+x}" ]; then
+ echo >&2 "***"
+ echo >&2 "*** Environment variable 'BINDGEN' is not set."
+ print_kbuild_explanation
+fi
+
+if [ -z "${CC+x}" ]; then
+ echo >&2 "***"
+ echo >&2 "*** Environment variable 'CC' is not set."
+ print_kbuild_explanation
+fi
+
# Check that the Rust compiler exists.
if ! command -v "$RUSTC" >/dev/null; then
echo >&2 "***"