Add --enable-rust configure switch

Introduce a way to optionally enable Rust integration for our builds. No
actual Rust code is added yet and specifying the flag has no effect
other than failing the build if rustc and cargo are unavailable.

7 files changed, 53 insertions, 15 deletions

diff --git a/Makefile.am b/Makefile.am
index be1dc7f7ef..b8aa049da1 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -25,6 +25,12 @@ else
 TESTING_TOR_BINARY=$(top_builddir)/src/or/tor$(EXEEXT)
 endif
 
+if USE_RUST
+rust_ldadd=
+else
+rust_ldadd=
+endif
+
 include src/include.am
 include doc/include.am
 include contrib/include.am
diff --git a/configure.ac b/configure.ac
index ff917354a3..d281903fcc 100644
--- a/configure.ac
+++ b/configure.ac
@@ -55,6 +55,8 @@ AC_ARG_ENABLE(oss-fuzz,
    AS_HELP_STRING(--enable-oss-fuzz, [build extra fuzzers based on 'oss-fuzz' environment]))
 AC_ARG_ENABLE(memory-sentinels,
    AS_HELP_STRING(--disable-memory-sentinels, [disable code that tries to prevent some kinds of memory access bugs. For fuzzing only.]))
+AC_ARG_ENABLE(rust,
+   AS_HELP_STRING(--enable-rust, [enable rust integration]))
 
 if test "x$enable_coverage" != "xyes" -a "x$enable_asserts_in_tests" = "xno" ; then
     AC_MSG_ERROR([Can't disable assertions outside of coverage build])
@@ -65,6 +67,7 @@ AM_CONDITIONAL(COVERAGE_ENABLED, test "x$enable_coverage" = "xyes")
 AM_CONDITIONAL(DISABLE_ASSERTS_IN_UNIT_TESTS, test "x$enable_asserts_in_tests" = "xno")
 AM_CONDITIONAL(LIBFUZZER_ENABLED, test "x$enable_libfuzzer" = "xyes")
 AM_CONDITIONAL(OSS_FUZZ_ENABLED, test "x$enable_oss_fuzz" = "xyes")
+AM_CONDITIONAL(USE_RUST, test "x$enable_rust" = "xyes")
 
 if test "$enable_static_tor" = "yes"; then
   enable_static_libevent="yes";
@@ -249,6 +252,23 @@ if test "x$PYTHON" = "x"; then
 fi
 AM_CONDITIONAL(USEPYTHON, [test "x$PYTHON" != "x"])
 
+
+if test "x$enable_rust" = "xyes"; then
+  AC_ARG_VAR([RUSTC], [path to the rustc binary])
+  AC_CHECK_PROG([RUSTC], [rustc], [rustc],[no])
+  if test "x$RUSTC" = "xno"; then
+    AC_MSG_ERROR([rustc unavailable but rust integration requested.])
+  fi
+
+  AC_ARG_VAR([CARGO], [path to the cargo binary])
+  AC_CHECK_PROG([CARGO], [cargo], [cargo],[no])
+  if test "x$CARGO" = "xno"; then
+    AC_MSG_ERROR([cargo unavailable but rust integration requested.])
+  fi
+
+  AC_DEFINE([HAVE_RUST], 1, [have Rust])
+fi
+
 ifdef([AC_C_FLEXIBLE_ARRAY_MEMBER], [
 AC_C_FLEXIBLE_ARRAY_MEMBER
 ], [
diff --git a/src/include.am b/src/include.am
index f78853f50f..90ecf90d45 100644
--- a/src/include.am
+++ b/src/include.am
@@ -2,6 +2,7 @@ include src/ext/include.am
 include src/trunnel/include.am
 include src/common/include.am
 include src/or/include.am
+include src/rust/include.am
 include src/test/include.am
 include src/tools/include.am
 include src/win32/include.am
diff --git a/src/or/include.am b/src/or/include.am
index 4c24dd23b3..ff7110ea99 100644
--- a/src/or/include.am
+++ b/src/or/include.am
@@ -123,7 +123,8 @@ src_or_tor_LDADD = src/or/libtor.a src/common/libor.a src/common/libor-ctime.a \
 	src/trace/libor-trace.a \
 	@TOR_ZLIB_LIBS@ @TOR_LIB_MATH@ @TOR_LIBEVENT_LIBS@ @TOR_OPENSSL_LIBS@ \
 	@TOR_LIB_WS32@ @TOR_LIB_GDI@ @CURVE25519_LIBS@ @TOR_SYSTEMD_LIBS@ \
-	@TOR_LZMA_LIBS@ @TOR_ZSTD_LIBS@
+	@TOR_LZMA_LIBS@ @TOR_ZSTD_LIBS@ \
+	$(rust_ldadd)
 
 if COVERAGE_ENABLED
 src_or_tor_cov_SOURCES = src/or/tor_main.c
diff --git a/src/test/fuzz/include.am b/src/test/fuzz/include.am
index 500377f6d7..6008238bba 100644
--- a/src/test/fuzz/include.am
+++ b/src/test/fuzz/include.am
@@ -20,7 +20,8 @@ FUZZING_LIBS = \
 	@TOR_OPENSSL_LIBS@ @TOR_LIB_WS32@ @TOR_LIB_GDI@ @CURVE25519_LIBS@ \
 	@TOR_SYSTEMD_LIBS@ \
 	@TOR_LZMA_LIBS@ \
-	@TOR_ZSTD_LIBS@
+	@TOR_ZSTD_LIBS@ \
+	$(rust_ldadd)
 
 oss-fuzz-prereqs: \
 	src/or/libtor-testing.a \
diff --git a/src/test/include.am b/src/test/include.am
index 230a6c8bad..8a465877d3 100644
--- a/src/test/include.am
+++ b/src/test/include.am
@@ -181,7 +181,8 @@ src_test_test_switch_id_LDADD = \
 	src/common/libor-testing.a \
 	src/common/libor-ctime-testing.a \
 	@TOR_ZLIB_LIBS@ @TOR_LIB_MATH@ \
-	@TOR_LZMA_LIBS@ @TOR_ZSTD_LIBS@
+	@TOR_LZMA_LIBS@ @TOR_ZSTD_LIBS@ \
+	$(rust_ldadd)
 
 src_test_test_LDFLAGS = @TOR_LDFLAGS_zlib@ @TOR_LDFLAGS_openssl@ \
         @TOR_LDFLAGS_libevent@
@@ -196,7 +197,8 @@ src_test_test_LDADD = src/or/libtor-testing.a \
 	src/trace/libor-trace.a \
 	@TOR_ZLIB_LIBS@ @TOR_LIB_MATH@ @TOR_LIBEVENT_LIBS@ \
 	@TOR_OPENSSL_LIBS@ @TOR_LIB_WS32@ @TOR_LIB_GDI@ @CURVE25519_LIBS@ \
-	@TOR_SYSTEMD_LIBS@ @TOR_LZMA_LIBS@ @TOR_ZSTD_LIBS@
+	@TOR_SYSTEMD_LIBS@ @TOR_LZMA_LIBS@ @TOR_ZSTD_LIBS@ \
+	$(rust_ldadd)
 
 src_test_test_slow_CPPFLAGS = $(src_test_test_CPPFLAGS)
 src_test_test_slow_CFLAGS = $(src_test_test_CFLAGS)
@@ -220,7 +222,8 @@ src_test_bench_LDADD = src/or/libtor.a src/common/libor.a \
 	src/trace/libor-trace.a \
 	@TOR_ZLIB_LIBS@ @TOR_LIB_MATH@ @TOR_LIBEVENT_LIBS@ \
 	@TOR_OPENSSL_LIBS@ @TOR_LIB_WS32@ @TOR_LIB_GDI@ @CURVE25519_LIBS@ \
-	@TOR_SYSTEMD_LIBS@ @TOR_LZMA_LIBS@ @TOR_ZSTD_LIBS@
+	@TOR_SYSTEMD_LIBS@ @TOR_LZMA_LIBS@ @TOR_ZSTD_LIBS@ \
+	$(rust_ldadd)
 
 src_test_test_workqueue_LDFLAGS = @TOR_LDFLAGS_zlib@ @TOR_LDFLAGS_openssl@ \
         @TOR_LDFLAGS_libevent@
@@ -232,7 +235,8 @@ src_test_test_workqueue_LDADD = src/or/libtor-testing.a \
 	src/trace/libor-trace.a \
 	@TOR_ZLIB_LIBS@ @TOR_LIB_MATH@ @TOR_LIBEVENT_LIBS@ \
 	@TOR_OPENSSL_LIBS@ @TOR_LIB_WS32@ @TOR_LIB_GDI@ @CURVE25519_LIBS@ \
-	@TOR_LZMA_LIBS@ @TOR_ZSTD_LIBS@
+	@TOR_LZMA_LIBS@ @TOR_ZSTD_LIBS@ \
+	$(rust_ldadd)
 
 src_test_test_timers_CPPFLAGS = $(src_test_test_CPPFLAGS)
 src_test_test_timers_CFLAGS = $(src_test_test_CFLAGS)
@@ -243,7 +247,8 @@ src_test_test_timers_LDADD = \
 	src/common/libor-crypto-testing.a $(LIBKECCAK_TINY) $(LIBDONNA) \
 	@TOR_ZLIB_LIBS@ @TOR_LIB_MATH@ @TOR_LIBEVENT_LIBS@ \
 	@TOR_OPENSSL_LIBS@ @TOR_LIB_WS32@ @TOR_LIB_GDI@ @CURVE25519_LIBS@ \
-	@TOR_LZMA_LIBS@
+	@TOR_LZMA_LIBS@ \
+	$(rust_ldadd)
 src_test_test_timers_LDFLAGS = $(src_test_test_LDFLAGS)
 
 noinst_HEADERS+= \
@@ -270,7 +275,8 @@ src_test_test_ntor_cl_LDADD = src/or/libtor.a src/common/libor.a \
 	src/trace/libor-trace.a \
 	@TOR_ZLIB_LIBS@ @TOR_LIB_MATH@ \
 	@TOR_OPENSSL_LIBS@ @TOR_LIB_WS32@ @TOR_LIB_GDI@ @CURVE25519_LIBS@ \
-	@TOR_LZMA_LIBS@
+	@TOR_LZMA_LIBS@ \
+	$(rust_ldadd)
 src_test_test_ntor_cl_AM_CPPFLAGS =	       \
 	-I"$(top_srcdir)/src/or"
 
@@ -291,7 +297,8 @@ src_test_test_bt_cl_LDADD = src/common/libor-testing.a \
 	src/common/libor-ctime-testing.a \
 	src/trace/libor-trace.a \
 	@TOR_LIB_MATH@ \
-	@TOR_LIB_WS32@ @TOR_LIB_GDI@
+	@TOR_LIB_WS32@ @TOR_LIB_GDI@ \
+	$(rust_ldadd)
 src_test_test_bt_cl_CFLAGS = $(AM_CFLAGS) $(TEST_CFLAGS)
 src_test_test_bt_cl_CPPFLAGS= $(src_test_AM_CPPFLAGS) $(TEST_CPPFLAGS)
 
diff --git a/src/tools/include.am b/src/tools/include.am
index 5eadb03a05..717af9e2ae 100644
--- a/src/tools/include.am
+++ b/src/tools/include.am
@@ -8,7 +8,8 @@ src_tools_tor_resolve_SOURCES = src/tools/tor-resolve.c
 src_tools_tor_resolve_LDFLAGS =
 src_tools_tor_resolve_LDADD = src/common/libor.a \
 	src/common/libor-ctime.a \
-	@TOR_LIB_MATH@ @TOR_LIB_WS32@
+	@TOR_LIB_MATH@ @TOR_LIB_WS32@ \
+	$(rust_ldadd)
 
 if COVERAGE_ENABLED
 src_tools_tor_cov_resolve_SOURCES = src/tools/tor-resolve.c
@@ -22,11 +23,12 @@ endif
 src_tools_tor_gencert_SOURCES = src/tools/tor-gencert.c
 src_tools_tor_gencert_LDFLAGS = @TOR_LDFLAGS_zlib@ @TOR_LDFLAGS_openssl@
 src_tools_tor_gencert_LDADD = src/common/libor.a src/common/libor-crypto.a \
-    src/common/libor-ctime.a \
-    $(LIBKECCAK_TINY) \
-    $(LIBDONNA) \
-    @TOR_LIB_MATH@ @TOR_ZLIB_LIBS@ @TOR_OPENSSL_LIBS@ \
-    @TOR_LIB_WS32@ @TOR_LIB_GDI@ @CURVE25519_LIBS@
+	src/common/libor-ctime.a \
+	$(LIBKECCAK_TINY) \
+	$(LIBDONNA) \
+	@TOR_LIB_MATH@ @TOR_ZLIB_LIBS@ @TOR_OPENSSL_LIBS@ \
+	@TOR_LIB_WS32@ @TOR_LIB_GDI@ @CURVE25519_LIBS@ \
+	$(rust_ldadd)
 
 if COVERAGE_ENABLED
 src_tools_tor_cov_gencert_SOURCES = src/tools/tor-gencert.c