qmake: Add test functions for comparing version numbers

qmake really lacks version comparing functions:
users either use ugly constructions to compare versions
by components, such as
greaterThan(QT_CLANG_MAJOR_VERSION, 3)|greaterThan(QT_CLANG_MINOR_VERSION, 4):
or even incorrectly compare versions as strings:
!lessThan(apple_clang_ver, "5.1")|!lessThan(reg_clang_ver, "3.4"):

Add test functions versionAtLeast and versionAtMost which use
QVersionNumber to compare version numbers by components.

Change-Id: I65e6b3c296d0301d544b7e38bf3d44f8d555c7fc
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>

5 files changed, 40 insertions, 2 deletions

diff --git a/qmake/Makefile.unix b/qmake/Makefile.unix
index 4df0ff281f..768cc0248e 100644
--- a/qmake/Makefile.unix
+++ b/qmake/Makefile.unix
@@ -30,8 +30,8 @@ QOBJS = \
 	qarraydata.o qbitarray.o qbytearray.o qbytearraymatcher.o \
 	qcryptographichash.o qdatetime.o qhash.o qlinkedlist.o qlist.o \
 	qlocale.o qlocale_tools.o qmap.o qregexp.o qringbuffer.o \
-	qstringbuilder.o qstring_compat.o qstring.o qstringlist.o qvsnprintf.o \
-	qxmlstream.o qxmlutils.o \
+	qstringbuilder.o qstring_compat.o qstring.o qstringlist.o qversionnumber.o \
+	qvsnprintf.o qxmlstream.o qxmlutils.o \
 	$(QTOBJS) $(QTOBJS2)
 # QTOBJS and QTOBJS2 are populated by Makefile.unix.* as for QTSRC (see below).
 # Note: qlibraryinfo.o omitted deliberately - see below.
@@ -120,6 +120,7 @@ DEPEND_SRC = \
 	   $(SOURCE_PATH)/src/corelib/tools/qstring_compat.cpp \
 	   $(SOURCE_PATH)/src/corelib/tools/qstring.cpp \
 	   $(SOURCE_PATH)/src/corelib/tools/qstringlist.cpp \
+	   $(SOURCE_PATH)/src/corelib/tools/qversionnumber.cpp \
 	   $(SOURCE_PATH)/src/corelib/tools/qvsnprintf.cpp \
 	   $(SOURCE_PATH)/src/corelib/xml/qxmlstream.cpp \
 	   $(SOURCE_PATH)/src/corelib/xml/qxmlutils.cpp \
@@ -356,6 +357,9 @@ qlocale_unix.o: $(SOURCE_PATH)/src/corelib/tools/qlocale_unix.cpp
 qlocale_win.o: $(SOURCE_PATH)/src/corelib/tools/qlocale_win.cpp
 	$(CXX) -c -o $@ $(CXXFLAGS) $<
 
+qversionnumber.o: $(SOURCE_PATH)/src/corelib/tools/qversionnumber.cpp
+	$(CXX) -c -o $@ $(CXXFLAGS) $<
+
 qdatastream.o: $(SOURCE_PATH)/src/corelib/io/qdatastream.cpp
 	$(CXX) -c -o $@ $(CXXFLAGS) $<
 
diff --git a/qmake/Makefile.win32 b/qmake/Makefile.win32
index 559870ff0e..4936b3587e 100644
--- a/qmake/Makefile.win32
+++ b/qmake/Makefile.win32
@@ -93,6 +93,7 @@ QTOBJS= \
 	qlocale.obj \
 	qlocale_tools.obj \
 	qlocale_win.obj \
+	qversionnumber.obj \
 	qmalloc.obj \
 	qmap.obj \
 	qoperatingsystemversion.obj \
diff --git a/qmake/doc/src/qmake-manual.qdoc b/qmake/doc/src/qmake-manual.qdoc
index d8ab7d096d..ceb93fde2d 100644
--- a/qmake/doc/src/qmake-manual.qdoc
+++ b/qmake/doc/src/qmake-manual.qdoc
@@ -3514,6 +3514,20 @@
 
     \snippet code/doc_src_qmake-manual.pro 169
 
+    \section2 versionAtLeast(variablename, versionNumber)
+
+    Tests that the version number from \c variablename is greater than or equal
+    to \c versionNumber. The version number is considered to be a sequence of
+    non-negative decimal numbers delimited by '.'; any non-numerical tail of
+    the string will be ignored. Comparison is performed segment-wise from left
+    to right; if one version is a prefix of the other, it is considered smaller.
+
+    \section2 versionAtMost(variablename, versionNumber)
+
+    Tests that the version number from \c variablename is less than or equal to
+    \c versionNumber. Works as
+    \l{versionAtLeast(variablename, versionNumber)}{versionAtLeast()}.
+
     \section2 warning(string)
 
     Always succeeds, and displays \c string as a warning message to the user.
diff --git a/qmake/library/qmakebuiltins.cpp b/qmake/library/qmakebuiltins.cpp
index 461f46e705..31b3ae6825 100644
--- a/qmake/library/qmakebuiltins.cpp
+++ b/qmake/library/qmakebuiltins.cpp
@@ -51,6 +51,7 @@
 #ifdef PROEVALUATOR_THREAD_SAFE
 # include <qthreadpool.h>
 #endif
+#include <qversionnumber.h>
 
 #include <algorithm>
 
@@ -99,6 +100,7 @@ enum ExpandFunc {
 
 enum TestFunc {
     T_INVALID = 0, T_REQUIRES, T_GREATERTHAN, T_LESSTHAN, T_EQUALS,
+    T_VERSION_AT_LEAST, T_VERSION_AT_MOST,
     T_EXISTS, T_EXPORT, T_CLEAR, T_UNSET, T_EVAL, T_CONFIG, T_SYSTEM,
     T_DEFINED, T_DISCARD_FROM, T_CONTAINS, T_INFILE,
     T_COUNT, T_ISEMPTY, T_PARSE_JSON, T_INCLUDE, T_LOAD, T_DEBUG, T_LOG, T_MESSAGE, T_WARNING, T_ERROR, T_IF,
@@ -172,6 +174,8 @@ void QMakeEvaluator::initFunctionStatics()
         { "lessThan", T_LESSTHAN },
         { "equals", T_EQUALS },
         { "isEqual", T_EQUALS },
+        { "versionAtLeast", T_VERSION_AT_LEAST },
+        { "versionAtMost", T_VERSION_AT_MOST },
         { "exists", T_EXISTS },
         { "export", T_EXPORT },
         { "clear", T_CLEAR },
@@ -1557,6 +1561,19 @@ QMakeEvaluator::VisitReturn QMakeEvaluator::evaluateBuiltinConditional(
         }
         return returnBool(values(map(args.at(0))).join(statics.field_sep)
                           == args.at(1).toQString(m_tmp1));
+    case T_VERSION_AT_LEAST:
+    case T_VERSION_AT_MOST: {
+        if (args.count() != 2) {
+            evalError(fL1S("%1(variable, versionNumber) requires two arguments.")
+                      .arg(function.toQString(m_tmp1)));
+            return ReturnFalse;
+        }
+        const QVersionNumber lvn = QVersionNumber::fromString(values(args.at(0).toKey()).join('.'));
+        const QVersionNumber rvn = QVersionNumber::fromString(args.at(1).toQString());
+        if (func_t == T_VERSION_AT_LEAST)
+            return returnBool(lvn >= rvn);
+        return returnBool(lvn <= rvn);
+    }
     case T_CLEAR: {
         if (args.count() != 1) {
             evalError(fL1S("%1(variable) requires one argument.")
diff --git a/qmake/qmake.pri b/qmake/qmake.pri
index b9ed9ce96a..77c190bb9a 100644
--- a/qmake/qmake.pri
+++ b/qmake/qmake.pri
@@ -68,6 +68,7 @@ bootstrap { #Qt code
         qlibraryinfo.cpp \
         qsystemerror.cpp \
         qvariant.cpp \
+        qversionnumber.cpp \
         qvsnprintf.cpp \
         qxmlstream.cpp \
         qxmlutils.cpp \
@@ -119,6 +120,7 @@ bootstrap { #Qt code
         qtextstream.h \
         quuid.h \
         qvector.h \
+        qversionnumber.h \
         qxmlstream.h \
         qxmlutils.h \
         qjson.h \