depends: Add cxxbridge command to dependencies

Cargo.toml

@@ -58,7 +58,8 @@ ed25519-zebra = "3"
 zeroize = "1.4.2"
 
 # Rust/C++ interop
-cxx = { version = "1.0", features = ["c++17"] }
+# The version needs to match depends/packages/native_cxxbridge.mk
+cxx = { version = "=1.0.68", features = ["c++17"] }
 
 # Rust threading
 rayon = "1.5"

configure.ac

@@ -101,6 +101,7 @@ ZC_REQUIRE_TOOL(STRIP, strip)
 ZC_REQUIRE_PROG([GIT], [git])
 ZC_REQUIRE_PROG(RUSTC, rustc)
 ZC_REQUIRE_PROG(CARGO, cargo)
+ZC_REQUIRE_PROG(CXXBRIDGE, cxxbridge)
 dnl This one is still optional and checked by complicated logic below:
 AC_PATH_PROG(CCACHE,ccache)
 dnl This one is not currently used anywhere, thus not required:

depends/packages/native_cxxbridge.mk

@@ -0,0 +1,17 @@
+package=native_cxxbridge
+# The version needs to match cxx in Cargo.toml
+$(package)_version=1.0.68
+$(package)_download_path=https://github.com/dtolnay/cxx/archive/refs/tags
+$(package)_file_name=native_cxxbridge-$($(package)_version).tar.gz
+$(package)_download_file=$($(package)_version).tar.gz
+$(package)_sha256_hash=6fed9ef1c64a37c343727368b38c27fa4e15b27ca9924c6672a6a5496080c832
+$(package)_build_subdir=gen/cmd
+$(package)_dependencies=native_rust
+
+define $(package)_build_cmds
+  cargo build --release --package=cxxbridge-cmd --bin=cxxbridge
+endef
+
+define $(package)_stage_cmds
+  cargo install --offline --path=. --bin=cxxbridge --root=$($(package)_staging_prefix_dir)
+endef

depends/packages/packages.mk

@@ -1,6 +1,6 @@
 zcash_packages := libsodium utfcpp
 packages := boost libevent zeromq $(zcash_packages) googletest
-native_packages := native_clang native_ccache native_rust
+native_packages := native_clang native_ccache native_rust native_cxxbridge
 
 ifneq (,$(wildcard /etc/arch-release))
 native_packages += native_libtinfo