add support for returning the command's exit status to $$system()

... and make use of it in qtRunLoggedCommand().

Change-Id: I242dfde344f555800cef1f55d3cb85418a93277f
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

mkspecs/features/configure_base.prf

@@ -32,16 +32,13 @@ defineTest(qtLog) {
 
 defineTest(qtRunLoggedCommand) {
     qtLog($$1)
-    write_file($${QMAKE_CONFIG_LOG}.part, "")
-    result = false
-    system("$$1 > \"$${QMAKE_CONFIG_LOG}.part\" 2>&1"): result = true
-
-    output = $$cat($${QMAKE_CONFIG_LOG}.part, blob)
 
+    output = $$system("$$1 2>&1", blob, result)
     write_file($${QMAKE_CONFIG_LOG}, output, append)
     $$QMAKE_CONFIG_VERBOSE: log($$output)
 
-    return($$result)
+    !equals(result, 0): return(false)
+    return(true)
 }
 
 isEmpty(QMAKE_CONFIG_TESTS_DIR): QMAKE_CONFIG_TESTS_DIR = $$_PRO_FILE_PWD_/config.tests

qmake/doc/src/qmake-manual.qdoc

@@ -3138,7 +3138,7 @@
 
     See also \l{fn_size}{size()}.
 
-    \section2 system(command[, mode])
+    \section2 system(command[, mode[, stsvar]])
 
     You can use this variant of the \c system function to obtain stdout from the
     command and assign it to a variable.
@@ -3147,6 +3147,11 @@
 
     \snippet code/doc_src_qmake-manual.pro 72
 
+    If you pass \c stsvar, the command's exit status will be stored in that
+    variable. If the command crashes, the status will be -1, otherwise a
+    non-negative exit code of the command's choosing. Usually, comparing
+    the status with zero (success) is sufficient.
+
     See also the test variant of \l{system(command)}{system()}.
 
     \section2 system_path(path)

qmake/library/qmakebuiltins.cpp

@@ -450,12 +450,13 @@ void QMakeEvaluator::runProcess(QProcess *proc, const QString &command) const
 }
 #endif
 
-QByteArray QMakeEvaluator::getCommandOutput(const QString &args) const
+QByteArray QMakeEvaluator::getCommandOutput(const QString &args, int *exitCode) const
 {
     QByteArray out;
 #ifndef QT_BOOTSTRAPPED
     QProcess proc;
     runProcess(&proc, args);
+    *exitCode = (proc.exitStatus() == QProcess::NormalExit) ? proc.exitCode() : -1;
     QByteArray errout = proc.readAllStandardError();
 # ifdef PROEVALUATOR_FULL
     // FIXME: Qt really should have the option to set forwarding per channel
@@ -483,7 +484,12 @@ QByteArray QMakeEvaluator::getCommandOutput(const QString &args) const
                 break;
             out += QByteArray(buff, read_in);
         }
-        QT_PCLOSE(proc);
+        int ec = QT_PCLOSE(proc);
+# ifdef Q_OS_WIN
+        *exitCode = ec >= 0 ? ec : -1;
+# else
+        *exitCode = WIFEXITED(ec) ? WEXITSTATUS(ec) : -1;
+# endif
     }
 # ifdef Q_OS_WIN
     out.replace("\r\n", "\n");
@@ -871,8 +877,8 @@ ProStringList QMakeEvaluator::evaluateBuiltinExpand(
         break;
     case E_SYSTEM:
         if (!m_skipLevel) {
-            if (args.count() < 1 || args.count() > 2) {
+            if (args.count() < 1 || args.count() > 3) {
-                evalError(fL1S("system(execute) requires one or two arguments."));
+                evalError(fL1S("system(command, [mode], [stsvar]) requires one to three arguments."));
             } else {
                 bool blob = false;
                 bool lines = false;
@@ -885,7 +891,12 @@ ProStringList QMakeEvaluator::evaluateBuiltinExpand(
                     else if (!args.at(1).compare(QLatin1String("lines"), Qt::CaseInsensitive))
                         lines = true;
                 }
-                QByteArray bytes = getCommandOutput(args.at(0).toQString(m_tmp2));
+                int exitCode;
+                QByteArray bytes = getCommandOutput(args.at(0).toQString(m_tmp2), &exitCode);
+                if (args.count() > 2 && !args.at(2).isEmpty()) {
+                    m_valuemapStack.top()[args.at(2).toKey()] =
+                            ProStringList(ProString(QString::number(exitCode)));
+                }
                 if (lines) {
                     QTextStream stream(bytes);
                     while (!stream.atEnd())

qmake/library/qmakeevaluator.h

@@ -240,7 +240,7 @@ public:
 #ifndef QT_BOOTSTRAPPED
     void runProcess(QProcess *proc, const QString &command) const;
 #endif
-    QByteArray getCommandOutput(const QString &args) const;
+    QByteArray getCommandOutput(const QString &args, int *exitCode) const;
 
     QMakeEvaluator *m_caller;
 #ifdef PROEVALUATOR_CUMULATIVE

tests/auto/tools/qmakelib/evaltest.cpp

@@ -1326,9 +1326,9 @@ void tst_qmakelib::addReplaceFunctions(const QString &qindir)
             << true;
 
     QTest::newRow("$$system(): bad number of arguments")
-            << "VAR = $$system(1, 2, 3)"
+            << "VAR = $$system(1, 2, 3, 4)"
             << "VAR ="
-            << "##:1: system(execute) requires one or two arguments."
+            << "##:1: system(command, [mode], [stsvar]) requires one to three arguments."
             << true;
 
     QTest::newRow("$$unique()")