Add a Makefile generator

At the very least, this is a useful debugging tool, as it displays the
artifacts part of the build graph in a familiar format.
Tested successfully with the qbs project itself: The generated Makefile
could be used to build a working qbs on Linux and Windows.

[ChangeLog] Added a Makefile generator

Task-number: QBS-33
Change-Id: I8165168d9273bdb4853d4ac566b72087f9104f7a
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>

5 files changed, 46 insertions, 1 deletions

diff --git a/tests/auto/blackbox/testdata/makefile-generator/app.qbs b/tests/auto/blackbox/testdata/makefile-generator/app.qbs
new file mode 100644
index 000000000..16981005a
--- /dev/null
+++ b/tests/auto/blackbox/testdata/makefile-generator/app.qbs
@@ -0,0 +1,13 @@
+import qbs
+
+CppApplication {
+    name: "the app"
+    consoleApplication: true
+    files: "main.cpp"
+    qbs.installPrefix: "/usr/local"
+    Group {
+        fileTagsFilter: "application"
+        qbs.install: true
+        qbs.installDir: "bin"
+    }
+}
diff --git a/tests/auto/blackbox/testdata/makefile-generator/main.cpp b/tests/auto/blackbox/testdata/makefile-generator/main.cpp
new file mode 100644
index 000000000..7f95e64bb
--- /dev/null
+++ b/tests/auto/blackbox/testdata/makefile-generator/main.cpp
@@ -0,0 +1,6 @@
+#include <iostream>
+
+int main()
+{
+    std::cout << "Hello, World!" << std::endl;
+}
diff --git a/tests/auto/blackbox/tst_blackbox.cpp b/tests/auto/blackbox/tst_blackbox.cpp
index c3885b88f..62930f54f 100644
--- a/tests/auto/blackbox/tst_blackbox.cpp
+++ b/tests/auto/blackbox/tst_blackbox.cpp
@@ -5464,6 +5464,30 @@ void TestBlackbox::localDeployment()
     QVERIFY2(m_qbsStdout.contains(content), m_qbsStdout.constData());
 }
 
+void TestBlackbox::makefileGenerator()
+{
+    QDir::setCurrent(testDataDir + "/makefile-generator");
+    const QbsRunParameters params("generate", QStringList{"-g", "makefile"});
+    QCOMPARE(runQbs(params), 0);
+    if (HostOsInfo::isWindowsHost())
+        return;
+    QProcess make;
+    make.setWorkingDirectory(QDir::currentPath() + '/' + relativeBuildDir());
+    const QString customInstallRoot = QDir::currentPath() + "/my-install-root";
+    make.start("make", QStringList{"INSTALL_ROOT=" + customInstallRoot, "install"});
+    QVERIFY(waitForProcessSuccess(make));
+    QVERIFY(QFile::exists(relativeExecutableFilePath("the app")));
+    QVERIFY(!QFile::exists(relativeBuildGraphFilePath()));
+    QProcess app;
+    app.start('"' + customInstallRoot + "/usr/local/bin/the app\"");
+    QVERIFY(waitForProcessSuccess(app));
+    const QByteArray appStdout = app.readAllStandardOutput();
+    QVERIFY2(appStdout.contains("Hello, World!"), appStdout.constData());
+    make.start("make", QStringList("clean"));
+    QVERIFY(waitForProcessSuccess(make));
+    QVERIFY(!QFile::exists(relativeExecutableFilePath("the app")));
+}
+
 void TestBlackbox::minimumSystemVersion()
 {
     rmDirR(relativeBuildDir());
diff --git a/tests/auto/blackbox/tst_blackbox.h b/tests/auto/blackbox/tst_blackbox.h
index 2804f513c..f3fb1f90d 100644
--- a/tests/auto/blackbox/tst_blackbox.h
+++ b/tests/auto/blackbox/tst_blackbox.h
@@ -154,6 +154,7 @@ private slots:
     void listPropertyOrder();
     void loadableModule();
     void localDeployment();
+    void makefileGenerator();
     void minimumSystemVersion();
     void minimumSystemVersion_data();
     void missingBuildGraph();
diff --git a/tests/auto/blackbox/tst_blackboxbase.cpp b/tests/auto/blackbox/tst_blackboxbase.cpp
index 6cc0766d6..b07f14553 100644
--- a/tests/auto/blackbox/tst_blackboxbase.cpp
+++ b/tests/auto/blackbox/tst_blackboxbase.cpp
@@ -86,7 +86,8 @@ int TestBlackboxBase::runQbs(const QbsRunParameters &params)
     }
     args << params.arguments;
     const bool commandImpliesResolve = params.command.isEmpty() || params.command == "resolve"
-            || params.command == "build" || params.command == "install" || params.command == "run";
+            || params.command == "build" || params.command == "install" || params.command == "run"
+            || params.command == "generate";
     if (!params.profile.isEmpty() && commandImpliesResolve) {
         args.push_back(QLatin1String("profile:") + params.profile);
     }