diff --git a/.travis.yml b/.travis.yml
index 2fa3d91af..3d1b9080f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -40,7 +40,11 @@ before_install:
 
   # gocovmerge is used to merge all the separate unit/integration test coverage
   # profiles.
-  - go get -u github.com/wadey/gocovmerge
+  - go get -u -v github.com/wadey/gocovmerge
+
+  # install gometalinter
+  - go get -u github.com/alecthomas/gometalinter
+  - gometalinter --install
 
 script:
   - . ./travis/$SCRIPT.sh
diff --git a/main_test.go b/main_test.go
index 7115a1deb..22ec2fe68 100644
--- a/main_test.go
+++ b/main_test.go
@@ -158,6 +158,14 @@ func TestIntegrationScripts(t *testing.T) {
 			r := util.GetRegex("warning: no packages being tested depend on .+\n")
 			goProgramStderr = r.ReplaceAllString(goProgramStderr, "")
 
+			// It is need only for "tests/assert.c"
+			// for change absolute path to local path
+			currentDir, err := os.Getwd()
+			if err != nil {
+				t.Fatal("Cannot get currently dir")
+			}
+			goProgramStderr = strings.Replace(goProgramStderr, currentDir+"/", "", -1)
+
 			if cProgramStderr != goProgramStderr {
 				t.Fatalf("Expected %s\nGot: %s", cProgramStderr, goProgramStderr)
 			}
diff --git a/preprocessor/preprocessor.go b/preprocessor/preprocessor.go
index 39fe6572b..adf3ee8e9 100644
--- a/preprocessor/preprocessor.go
+++ b/preprocessor/preprocessor.go
@@ -4,7 +4,11 @@ import (
 	"bufio"
 	"bytes"
 	"fmt"
+	"io/ioutil"
+	"os"
 	"os/exec"
+	"path/filepath"
+	"runtime"
 	"strings"
 	"text/scanner"
 
@@ -150,7 +154,8 @@ func Analyze(inputFiles, clangFlags []string) (pp []byte, comments []program.Com
 func analyzeFiles(inputFiles, clangFlags []string) (items []entity, err error) {
 	// See : https://clang.llvm.org/docs/CommandGuide/clang.html
 	// clang -E <file>    Run the preprocessor stage.
-	out, err := getPreprocessSources(inputFiles, clangFlags)
+	var out bytes.Buffer
+	out, err = getPreprocessSources(inputFiles, clangFlags)
 	if err != nil {
 		return
 	}
@@ -196,31 +201,62 @@ func analyzeFiles(inputFiles, clangFlags []string) (items []entity, err error) {
 // See : https://clang.llvm.org/docs/CommandGuide/clang.html
 // clang -E <file>    Run the preprocessor stage.
 func getPreprocessSources(inputFiles, clangFlags []string) (out bytes.Buffer, err error) {
-	var stderr bytes.Buffer
-	for _, inputFile := range inputFiles {
-		if inputFile[len(inputFile)-1] != 'c' {
-			continue
-		}
+	// get temp dir
+	dir, err := ioutil.TempDir("", "c2go-union")
+	if err != nil {
+		return
+	}
+	defer func() { _ = os.RemoveAll(dir) }()
 
-		var args []string
-		args = append(args, "-E", "-C")
-		args = append(args, clangFlags...)
-		args = append(args, inputFile)
+	// file name union file
+	var unionFileName = dir + "/" + "unionFileName.c"
 
-		var outFile bytes.Buffer
-		cmd := exec.Command("clang", args...)
-		cmd.Stdout = &outFile
-		cmd.Stderr = &stderr
-		err = cmd.Run()
-		if err != nil {
-			err = fmt.Errorf("preprocess for file: %s\nfailed: %v\nStdErr = %v", inputFile, err, stderr.String())
-			return
-		}
-		_, err = out.Write(outFile.Bytes())
+	// create a body for union file
+	var unionBody string
+	for i := range inputFiles {
+		var absPath string
+		absPath, err = filepath.Abs(inputFiles[i])
 		if err != nil {
 			return
 		}
+		unionBody += fmt.Sprintf("#include \"%s\"\n", absPath)
+	}
+
+	// write a union file
+	err = ioutil.WriteFile(unionFileName, []byte(unionBody), 0644)
+	if err != nil {
+		return
+	}
+
+	// Add open source defines
+	if runtime.GOOS == "darwin" {
+		clangFlags = append(clangFlags, "-D_XOPEN_SOURCE")
+	} else {
+		clangFlags = append(clangFlags, "-D_GNU_SOURCE")
+	}
+
+	// preprocessor clang
+	var stderr bytes.Buffer
+
+	var args []string
+	args = append(args, "-E", "-C")
+	args = append(args, clangFlags...)
+	args = append(args, unionFileName) // All inputFiles
+
+	var outFile bytes.Buffer
+	cmd := exec.Command("clang", args...)
+	cmd.Stdout = &outFile
+	cmd.Stderr = &stderr
+	err = cmd.Run()
+	if err != nil {
+		err = fmt.Errorf("preprocess for file: %v\nfailed: %v\nStdErr = %v", inputFiles, err, stderr.String())
+		return
 	}
+	_, err = out.Write(outFile.Bytes())
+	if err != nil {
+		return
+	}
+
 	return
 }
 
@@ -232,6 +268,12 @@ func GetIncludeListWithUserSource(inputFiles, clangFlags []string) (lines []stri
 	var out bytes.Buffer
 	var stderr bytes.Buffer
 	var args []string
+	for i := range inputFiles {
+		inputFiles[i], err = filepath.Abs(inputFiles[i])
+		if err != nil {
+			return
+		}
+	}
 	args = append(args, "-MM", "-c")
 	args = append(args, inputFiles...)
 	args = append(args, clangFlags...)
diff --git a/travis/test.sh b/travis/test.sh
index f3bc70b1e..664ff0aac 100755
--- a/travis/test.sh
+++ b/travis/test.sh
@@ -108,3 +108,14 @@ if [ "$TRAVIS_OS_NAME" == "osx" ]; then
     curl -H "Authorization: token ${GITHUB_API_TOKEN}" -H "Content-Type: application/json" https://api.github.com/repos/elliotchance/c2go/statuses/${TRAVIS_COMMIT} -d "{\"state\": \"success\",\"target_url\": \"https://travis-ci.org/elliotchance/c2go/builds/${TRAVIS_JOB_ID}\", \"description\": \"$(($SQLITE_WARNINGS)) warnings\", \"context\": \"c2go/sqlite3\"}" 
 fi
 
+# SQLITE
+c2go transpile -o="$SQLITE_TEMP_FOLDER/sqlite.go" -clang-flag="-DSQLITE_THREADSAFE=0" -clang-flag="-DSQLITE_OMIT_LOAD_EXTENSION" $SQLITE_TEMP_FOLDER/$SQLITE3_FILE/shell.c $SQLITE_TEMP_FOLDER/$SQLITE3_FILE/sqlite3.c
+
+# Show amount "Warning":
+SQLITE_WARNINGS=`cat $SQLITE_TEMP_FOLDER/sqlite.go | grep "// Warning" | wc -l`
+echo "After transpiling shell.c and sqlite3.c together, have summary: $SQLITE_WARNINGS warnings."
+
+# Amount warning from gometalinter
+echo "Calculation warnings by gometalinter"
+GOMETALINTER_WARNINGS=`$GOPATH/bin/gometalinter $SQLITE_TEMP_FOLDER/sqlite.go 2>&1 | wc -l`
+echo "Amount found warnings by gometalinter at 30 second : $GOMETALINTER_WARNINGS warnings."