Add mingw GCC Version to qconfig.pri

This change adds missing variables in mkspecs/qconfig.pri about gcc
compiler version when using mingw: QT_GCC_{MAJOR,MINOR,PATCH}_VERSION
This is needed in case CONFIG += c++14 is used.

Task-number: QTBUG-44142
Change-Id: I34c27f9154bb745a8ee75c777a0acbdbc5bda5a9
Reviewed-by: Louai Al-Khanji <louai.al-khanji@theqtcompany.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/tools/configure/environment.cpp b/tools/configure/environment.cpp
index c08595e36b..63c1e8a1f0 100644
--- a/tools/configure/environment.cpp
+++ b/tools/configure/environment.cpp
@@ -163,6 +163,18 @@ Compiler Environment::compilerFromQMakeSpec(const QString &qmakeSpec)
     return CC_UNKNOWN;
 }
 
+QString Environment::gccVersion()
+{
+    CompilerInfo *info = compilerInfo(CC_MINGW);
+    int returnValue = 0;
+    QString version = execute(QStringLiteral("%1 -dumpversion").arg(info->executable), &returnValue);
+    if (returnValue != 0) {
+        cout << "Could not get mingw version" << returnValue << qPrintable(version);
+        version.resize(0);
+    }
+    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