Add logging diagnostics to nail down the build script failures

Author: phausler

utils/build-script-impl

@@ -2391,6 +2391,7 @@ for host in "${ALL_HOSTS[@]}"; do
                 LLVM_BIN="$(build_directory_bin ${LOCAL_HOST} llvm)"
 
                 if [[ "${RECONFIGURE}" || ! -f "${LIBDISPATCH_BUILD_DIR}"/config.status ]]; then
+                    echo "Reconfiguring libdispatch"
                     # First time building; need to run autotools and configure
                     if [[ "$LIBDISPATCH_BUILD_TYPE" == "Release" ]] ; then
                         dispatch_build_variant_arg="release"
@@ -2400,14 +2401,16 @@ for host in "${ALL_HOSTS[@]}"; do
                         dispatch_build_variant_arg="debug"
                     fi
                     call mkdir -p "${LIBDISPATCH_BUILD_DIR}"
+                    echo `which autoreconf`
                     with_pushd "${LIBDISPATCH_SOURCE_DIR}" \
                         call autoreconf -fvi
                     with_pushd "${LIBDISPATCH_BUILD_DIR}" \
                         call env CC="${LLVM_BIN}/clang" CXX="${LLVM_BIN}/clang++" SWIFTC="${SWIFTC_BIN}" \
                             "${LIBDISPATCH_SOURCE_DIR}"/configure --with-swift-toolchain="${SWIFT_BUILD_PATH}" \
                             --with-build-variant=$dispatch_build_variant_arg \
                             --prefix="$(get_host_install_destdir ${host})$(get_host_install_prefix ${host})"
-
+                else
+                    echo "Skipping reconfiguration of libdispatch"
                 fi
                 with_pushd "${LIBDISPATCH_BUILD_DIR}" \
                     call make