[xharness] Automatically generate xharness make dependencies. (#8324)

tests/Makefile

@@ -198,8 +198,10 @@ $(TOP)/tools/common/SdkVersions.cs: $(TOP)/tools/common/SdkVersions.cs.in
 	@$(MAKE) -C $(TOP)/src project-files
 	@touch $@
 
-xharness/xharness.exe: $(wildcard xharness/*.cs) $(wildcard $(TOP)/tools/bcl-test-importer/BCLTestImporter/*.cs) xharness/xharness.csproj $(TOP)/tools/common/SdkVersions.cs test.config test-system.config .stamp-src-project-files
+xharness/xharness.exe: $(xharness_dependencies) test.config test-system.config .stamp-src-project-files
 	$(Q_GEN) $(SYSTEM_MSBUILD) /restore $(MSBUILD_VERBOSITY_QUIET) xharness/xharness.csproj
+xharness/xharness.csproj.inc: export ABSOLUTE_PATHS=1
+-include xharness/xharness.csproj.inc
 
 killall:
 	@killall "iPhone Simulator" >/dev/null 2>&1 || true

tests/xharness/.gitignore

@@ -1,2 +1,3 @@
+xharness.csproj.inc
 tmp-test-dir
 

tools/common/create-makefile-fragment.sh

@@ -86,7 +86,7 @@ for proj in $(sort "$REFERENCES_PATH" | uniq); do
 	sed -i '' "s@^@$proj_dir/@" "$inputs_path"
 
 	# Change to Make syntax. This is horrifically difficult in MSBuild,
-	# because MSBuild blindly replaces backslashes with forword slashes (i.e.
+	# because MSBuild blindly replaces backslashes with forward slashes (i.e.
 	# windows paths to unix paths...)
 	sed -i '' "s_^\\(.*\\)\$_    \\1 \\\\_" "$inputs_path"
 
@@ -103,7 +103,9 @@ echo "${PROJECT}_dependencies = \\" >> "$FRAGMENT_PATH"
 sort "${INPUT_PATHS[@]}" | uniq >> "$FRAGMENT_PATH"
 
 # Simplify paths somewhat by removing the current directory
-sed -i '' "s@$PROJECT_DIR/@@" "$FRAGMENT_PATH"
+if test -z "$ABSOLUTE_PATHS"; then
+	sed -i '' "s@$PROJECT_DIR/@@" "$FRAGMENT_PATH"
+fi
 
 # Cleanup
 rm -f "${INPUT_PATHS[@]}"