build: Always compile module support for tests

The --disable-module-* configure option removes code from the final binary but
we still build the unit tests with the disable module(s) so we can actually
test that code path all the time and not forget about it.

Signed-off-by: David Goulet <dgoulet@torproject.org>

Makefile.am

@@ -51,14 +51,14 @@ AM_ETAGSFLAGS=--regex='{c}/MOCK_IMPL([^,]+,\W*\([a-zA-Z0-9_]+\)\W*,/\1/s'
 if COVERAGE_ENABLED
 TEST_CFLAGS=-fno-inline -fprofile-arcs -ftest-coverage
 if DISABLE_ASSERTS_IN_UNIT_TESTS
-TEST_CPPFLAGS=-DTOR_UNIT_TESTS -DTOR_COVERAGE -DDISABLE_ASSERTS_IN_UNIT_TESTS
+TEST_CPPFLAGS=-DTOR_UNIT_TESTS -DTOR_COVERAGE -DDISABLE_ASSERTS_IN_UNIT_TESTS @TOR_MODULES_ALL_ENABLED@
 else
-TEST_CPPFLAGS=-DTOR_UNIT_TESTS -DTOR_COVERAGE
+TEST_CPPFLAGS=-DTOR_UNIT_TESTS -DTOR_COVERAGE @TOR_MODULES_ALL_ENABLED@
 endif
 TEST_NETWORK_FLAGS=--coverage --hs-multi-client 1
 else
 TEST_CFLAGS=
-TEST_CPPFLAGS=-DTOR_UNIT_TESTS
+TEST_CPPFLAGS=-DTOR_UNIT_TESTS @TOR_MODULES_ALL_ENABLED@
 TEST_NETWORK_FLAGS=--hs-multi-client 1
 endif
 TEST_NETWORK_WARNING_FLAGS=--quiet --only-warnings

configure.ac

@@ -234,6 +234,9 @@ dnl ---
 dnl Tor modules options. These options are namespaced with --disable-module-XXX
 dnl ---
 
+dnl All our modules.
+m4_define(MODULES, dirauth)
+
 dnl Directory Authority module.
 AC_ARG_ENABLE([module-dirauth],
               AS_HELP_STRING([--disable-module-dirauth],
@@ -243,6 +246,15 @@ AC_ARG_ENABLE([module-dirauth],
                         [Compile with Directory Authority feature support]))
 AM_CONDITIONAL(BUILD_MODULE_DIRAUTH, [test "x$enable_module_dirauth" != "xno"])
 
+dnl Helper variables.
+TOR_MODULES_ALL_ENABLED=
+AC_DEFUN([ADD_MODULE], [
+    MODULE=m4_toupper($1)
+    TOR_MODULES_ALL_ENABLED="${TOR_MODULES_ALL_ENABLED} -DHAVE_MODULE_${MODULE}=1"
+])
+m4_foreach_w([module], MODULES, [ADD_MODULE([module])])
+AC_SUBST(TOR_MODULES_ALL_ENABLED)
+
 dnl check for the correct "ar" when cross-compiling.
 dnl   (AM_PROG_AR was new in automake 1.11.2, which we do not yet require,
 dnl    so kludge up a replacement for the case where it isn't there yet.)

src/or/include.am

@@ -114,20 +114,23 @@ LIBTOR_A_SOURCES = \
 
 #
 # Modules are conditionnally compiled in tor starting here. We add the C files
-# only if the modules has been enabled at configure time.
+# only if the modules has been enabled at configure time. We always add the
+# source files of every module to libtor-testing.a so we can build the unit
+# tests for everything.
 #
 
 # The Directory Authority module.
-if BUILD_MODULE_DIRAUTH
-LIBTOR_A_SOURCES += \
+MODULE_DIRAUTH_SOURCES = \
 	src/or/dirauth/dircollate.c				\
 	src/or/dirauth/dirvote.c				\
 	src/or/dirauth/shared_random.c				\
 	src/or/dirauth/shared_random_state.c
+if BUILD_MODULE_DIRAUTH
+LIBTOR_A_SOURCES += $(MODULE_DIRAUTH_SOURCES)
 endif
 
 src_or_libtor_a_SOURCES = $(LIBTOR_A_SOURCES)
-src_or_libtor_testing_a_SOURCES = $(LIBTOR_A_SOURCES)
+src_or_libtor_testing_a_SOURCES = $(LIBTOR_A_SOURCES) $(MODULE_DIRAUTH_SOURCES)
 
 src_or_tor_SOURCES = src/or/tor_main.c
 AM_CPPFLAGS += -I$(srcdir)/src/or -Isrc/or