Add ./configure --disable-tests option

Building without tests is useful for bootstrapping with a smaller footprint
or running the tests in a separate derivation. Otherwise, we do compile and
run them.

This isn't fine grained as to allow picking `check` but not `installcheck`
or vice versa, but it's good enough for now.

I've tried to use Nixpkgs' `checkInputs`, but those inputs weren't discovered
properly by the configure script. We can emulate its behavior very well though.

Makefile

@@ -2,13 +2,10 @@ makefiles = \
   mk/precompiled-headers.mk \
   local.mk \
   src/libutil/local.mk \
-  src/libutil/tests/local.mk \
   src/libstore/local.mk \
-  src/libstore/tests/local.mk \
   src/libfetchers/local.mk \
   src/libmain/local.mk \
   src/libexpr/local.mk \
-  src/libexpr/tests/local.mk \
   src/libcmd/local.mk \
   src/nix/local.mk \
   src/resolve-system-dependencies/local.mk \
@@ -19,12 +16,22 @@ makefiles = \
   misc/systemd/local.mk \
   misc/launchd/local.mk \
   misc/upstart/local.mk \
-  doc/manual/local.mk \
+  doc/manual/local.mk
-  tests/local.mk \
-  tests/plugins/local.mk
 
 -include Makefile.config
 
+ifeq ($(tests), yes)
+makefiles += \
+  src/libutil/tests/local.mk \
+  src/libstore/tests/local.mk \
+  src/libexpr/tests/local.mk \
+  tests/local.mk \
+  tests/plugins/local.mk
+else
+makefiles += \
+  mk/disable-tests.mk
+endif
+
 OPTIMIZE = 1
 
 ifeq ($(OPTIMIZE), 1)

Makefile.config.in

@@ -45,3 +45,4 @@ sandbox_shell = @sandbox_shell@
 storedir = @storedir@
 sysconfdir = @sysconfdir@
 system = @system@
+tests = @tests@

configure.ac

@@ -145,6 +145,13 @@ if test "x$GCC_ATOMIC_BUILTINS_NEED_LIBATOMIC" = xyes; then
     LDFLAGS="-latomic $LDFLAGS"
 fi
 
+# Building without tests is useful for bootstrapping with a smaller footprint
+# or running the tests in a separate derivation. Otherwise, we do compile and
+# run them.
+AC_ARG_ENABLE(tests, AS_HELP_STRING([--disable-tests],[Do not build the tests]),
+  tests=$enableval, tests=yes)
+AC_SUBST(tests)
+
 # LTO is currently broken with clang for unknown reasons; ld segfaults in the llvm plugin
 AC_ARG_ENABLE(lto, AS_HELP_STRING([--enable-lto],[Enable LTO (only supported with GCC) [default=no]]),
   lto=$enableval, lto=no)
@@ -270,6 +277,8 @@ if test "$gc" = yes; then
 fi
 
 
+if test "$tests" = yes; then
+
 # Look for gtest.
 PKG_CHECK_MODULES([GTEST], [gtest_main])
 
@@ -282,6 +291,7 @@ dnl No good for C++ libs with mangled symbols
 dnl AC_CHECK_LIB([rapidcheck], [])
 AC_LANG_POP(C++)
 
+fi
 
 # Look for nlohmann/json.
 PKG_CHECK_MODULES([NLOHMANN_JSON], [nlohmann_json >= 3.9])

flake.nix

@@ -89,15 +89,16 @@
         });
 
         configureFlags =
-          [
+          lib.optionals stdenv.isLinux [
-            "CXXFLAGS=-I${lib.getDev rapidcheck}/extras/gtest/include"
-          ] ++ lib.optionals stdenv.isLinux [
             "--with-boost=${boost}/lib"
             "--with-sandbox-shell=${sh}/bin/busybox"
           ]
           ++ lib.optionals (stdenv.isLinux && !(isStatic && stdenv.system == "aarch64-linux")) [
             "LDFLAGS=-fuse-ld=gold"
           ];
+        testConfigureFlags = [
+          "CXXFLAGS=-I${lib.getDev rapidcheck}/extras/gtest/include"
+        ];
 
         nativeBuildDeps =
           [
@@ -124,13 +125,16 @@
             libarchive
             boost
             lowdown-nix
-            gtest
-            rapidcheck
           ]
           ++ lib.optionals stdenv.isLinux [libseccomp]
           ++ lib.optional (stdenv.isLinux || stdenv.isDarwin) libsodium
           ++ lib.optional stdenv.hostPlatform.isx86_64 libcpuid;
 
+        checkDeps = [
+          gtest
+          rapidcheck
+        ];
+
         awsDeps = lib.optional (stdenv.isLinux || stdenv.isDarwin)
           (aws-sdk-cpp.override {
             apis = ["s3" "transfer"];
@@ -200,7 +204,7 @@
         VERSION_SUFFIX = versionSuffix;
 
         nativeBuildInputs = nativeBuildDeps;
-        buildInputs = buildDeps ++ awsDeps;
+        buildInputs = buildDeps ++ awsDeps ++ checkDeps;
         propagatedBuildInputs = propagatedDeps;
 
         enableParallelBuilding = true;
@@ -305,7 +309,7 @@
           };
           let
             canRunInstalled = currentStdenv.buildPlatform.canExecute currentStdenv.hostPlatform;
-          in currentStdenv.mkDerivation {
+          in currentStdenv.mkDerivation (finalAttrs: {
             name = "nix-${version}";
             inherit version;
 
@@ -318,7 +322,8 @@
             nativeBuildInputs = nativeBuildDeps;
             buildInputs = buildDeps
               # There have been issues building these dependencies
-              ++ lib.optionals (currentStdenv.hostPlatform == currentStdenv.buildPlatform) awsDeps;
+              ++ lib.optionals (currentStdenv.hostPlatform == currentStdenv.buildPlatform) awsDeps
+              ++ lib.optionals finalAttrs.doCheck checkDeps;
 
             propagatedBuildInputs = propagatedDeps;
 
@@ -348,6 +353,7 @@
             configureFlags = configureFlags ++
               [ "--sysconfdir=/etc" ] ++
               lib.optional stdenv.hostPlatform.isStatic "--enable-embedded-sandbox-shell" ++
+              (if finalAttrs.doCheck then testConfigureFlags else [ "--disable-tests" ]) ++
               lib.optional (!canRunInstalled) "--disable-doc-gen";
 
             enableParallelBuilding = true;
@@ -369,7 +375,7 @@
               ''}
             '';
 
-            doInstallCheck = true;
+            doInstallCheck = finalAttrs.doCheck;
             installCheckFlags = "sysconfdir=$(out)/etc";
 
             separateDebugInfo = !currentStdenv.hostPlatform.isStatic;
@@ -411,7 +417,7 @@
             });
 
             meta.platforms = lib.platforms.unix;
-          };
+          });
 
           lowdown-nix = with final; currentStdenv.mkDerivation rec {
             name = "lowdown-0.9.0";
@@ -462,6 +468,14 @@
 
         buildNoGc = forAllSystems (system: self.packages.${system}.nix.overrideAttrs (a: { configureFlags = (a.configureFlags or []) ++ ["--enable-gc=no"];}));
 
+        buildNoTests = forAllSystems (system:
+          self.packages.${system}.nix.overrideAttrs (a: {
+            doCheck =
+              assert ! a?dontCheck;
+              false;
+          })
+        );
+
         # Perl bindings for various platforms.
         perlBindings = forAllSystems (system: nixpkgsFor.${system}.native.nix.perl-bindings);
 
@@ -634,7 +648,7 @@
             nativeBuildInputs = nativeBuildDeps
                                 ++ (lib.optionals stdenv.cc.isClang [ pkgs.bear pkgs.clang-tools ]);
 
-            buildInputs = buildDeps ++ propagatedDeps ++ awsDeps;
+            buildInputs = buildDeps ++ propagatedDeps ++ awsDeps ++ checkDeps;
 
             inherit configureFlags;
 

mk/disable-tests.mk

@@ -0,0 +1,12 @@
+# This file is only active for `./configure --disable-tests`.
+# Running `make check` or `make installcheck` would indicate a mistake in the
+# caller.
+
+installcheck:
+	@echo "Tests are disabled. Configure without '--disable-tests', or avoid calling 'make installcheck'."
+	@exit 1
+
+# This currently has little effect.
+check:
+	@echo "Tests are disabled. Configure without '--disable-tests', or avoid calling 'make check'."
+	@exit 1