configure.exe: Write MSVC compiler version to qconfig.pri

Backport a feature of the new configure system setting the
variables QT_CL_MAJOR_VERSION, QT_CL_MINOR_VERSION,
QT_CL_PATCH_VERSION similarly to the existing variables for gcc.
This allows for disabling optimizations depending on the compiler
version.

Task-number: QTBUG-55238
Change-Id: If2349b008c1049e2ab98a5c1160b244a6e8937a8
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>

3 files changed, 35 insertions, 0 deletions

diff --git a/tools/configure/configureapp.cpp b/tools/configure/configureapp.cpp
index f2b54f57f2..88dcd8170b 100644
--- a/tools/configure/configureapp.cpp
+++ b/tools/configure/configureapp.cpp
@@ -314,6 +314,12 @@ Configure::Configure(int& argc, char** argv) : verbose(0)
         dictionary["QT_GCC_MAJOR_VERSION"] = parts.value(0, zero);
         dictionary["QT_GCC_MINOR_VERSION"] = parts.value(1, zero);
         dictionary["QT_GCC_PATCH_VERSION"] = parts.value(2, zero);
+    } else if (dictionary["QMAKESPEC"].contains(QString("msvc"))) {
+        const QString zero = QStringLiteral("0");
+        const QStringList parts = Environment::msvcVersion().split(QLatin1Char('.'));
+        dictionary["QT_CL_MAJOR_VERSION"] = parts.value(0, zero);
+        dictionary["QT_CL_MINOR_VERSION"] = parts.value(1, zero);
+        dictionary["QT_CL_PATCH_VERSION"] = parts.value(2, zero);
     }
 }
 
@@ -3629,6 +3635,10 @@ void Configure::generateQConfigPri()
             configStream << "QT_GCC_MAJOR_VERSION = " << dictionary["QT_GCC_MAJOR_VERSION"] << endl
                          << "QT_GCC_MINOR_VERSION = " << dictionary["QT_GCC_MINOR_VERSION"] << endl
                          << "QT_GCC_PATCH_VERSION = " << dictionary["QT_GCC_PATCH_VERSION"] << endl;
+        } else if (!dictionary["QT_CL_MAJOR_VERSION"].isEmpty()) {
+            configStream << "QT_CL_MAJOR_VERSION = " << dictionary["QT_CL_MAJOR_VERSION"] << endl
+                         << "QT_CL_MINOR_VERSION = " << dictionary["QT_CL_MINOR_VERSION"] << endl
+                         << "QT_CL_PATCH_VERSION = " << dictionary["QT_CL_PATCH_VERSION"] << endl;
         }
 
         if (dictionary.value("XQMAKESPEC").startsWith("wince")) {
diff --git a/tools/configure/environment.cpp b/tools/configure/environment.cpp
index 5e28fda11d..10cf5ace2a 100644
--- a/tools/configure/environment.cpp
+++ b/tools/configure/environment.cpp
@@ -169,6 +169,30 @@ QString Environment::gccVersion()
     return version;
 }
 
+QString Environment::msvcVersion()
+{
+    int returnValue = 0;
+    // Extract version from standard error output of "cl /?"
+    const QString command = QFile::decodeName(qgetenv("ComSpec"))
+        + QLatin1String(" /c ") + QLatin1String(compilerInfo(CC_MSVC2015)->executable)
+        + QLatin1String(" /? 2>&1");
+    QString version = execute(command, &returnValue);
+    if (returnValue != 0) {
+        cout << "Could not get cl version" << returnValue << qPrintable(version) << '\n';;
+        version.clear();
+    } else {
+        QRegExp versionRegexp(QStringLiteral("^.*Compiler Version ([0-9.]+) for.*$"));
+        Q_ASSERT(versionRegexp.isValid());
+        if (versionRegexp.exactMatch(version)) {
+            version = versionRegexp.cap(1);
+        } else {
+            cout << "Unable to determine cl version from the output of \""
+                << qPrintable(command) << "\"\n";
+        }
+    }
+    return version;
+}
+
 /*!
     Returns the enum of the compiler which was detected on the system.
     The compilers are detected in the order as entered into the
diff --git a/tools/configure/environment.h b/tools/configure/environment.h
index 927c3e294f..d096782e70 100644
--- a/tools/configure/environment.h
+++ b/tools/configure/environment.h
@@ -57,6 +57,7 @@ public:
     static QString detectQMakeSpec();
     static Compiler compilerFromQMakeSpec(const QString &qmakeSpec);
     static QString gccVersion();
+    static QString msvcVersion();
 
     static int execute(QStringList arguments, const QStringList &additionalEnv, const QStringList &removeEnv);
     static QString execute(const QString &command, int *returnCode = 0);