Split out a new libnixflake

Co-authored-by: Robert Hensing <roberth@users.noreply.github.com>

tests/unit/libflake/local.mk

@@ -0,0 +1,43 @@
+check: libflake-tests_RUN
+
+programs += libflake-tests
+
+libflake-tests_NAME := libnixflake-tests
+
+libflake-tests_ENV := _NIX_TEST_UNIT_DATA=$(d)/data GTEST_OUTPUT=xml:$$testresults/libflake-tests.xml
+
+libflake-tests_DIR := $(d)
+
+ifeq ($(INSTALL_UNIT_TESTS), yes)
+  libflake-tests_INSTALL_DIR := $(checkbindir)
+else
+  libflake-tests_INSTALL_DIR :=
+endif
+
+libflake-tests_SOURCES := \
+    $(wildcard $(d)/*.cc) \
+    $(wildcard $(d)/value/*.cc) \
+    $(wildcard $(d)/flake/*.cc)
+
+libflake-tests_EXTRA_INCLUDES = \
+    -I tests/unit/libflake-support \
+    -I tests/unit/libstore-support \
+    -I tests/unit/libutil-support \
+    $(INCLUDE_libflake) \
+    $(INCLUDE_libexpr) \
+    $(INCLUDE_libfetchers) \
+    $(INCLUDE_libstore) \
+    $(INCLUDE_libutil) \
+
+libflake-tests_CXXFLAGS += $(libflake-tests_EXTRA_INCLUDES)
+
+libflake-tests_LIBS = \
+    libexpr-test-support libstore-test-support libutil-test-support \
+    libflake libexpr libfetchers libstore libutil
+
+libflake-tests_LDFLAGS := -lrapidcheck $(GTEST_LIBS) -lgmock
+
+ifdef HOST_WINDOWS
+  # Increase the default reserved stack size to 65 MB so Nix doesn't run out of space
+  libflake-tests_LDFLAGS += -Wl,--stack,$(shell echo $$((65 * 1024 * 1024)))
+endif