introduce ability to build projects for the host system

when qmake runs into the new option(host_build) command, it will restart
the project evaluation with a host spec.

the new default host spec is called default-host (gasp!). it is
overridden with the pre-exising -spec / -platform option, while the new
-xspec / -xplatform option overrides the pre-existing default spec.
specifying -spec but not -xspec will set the xspec, too, so the behavior
is backwards-compatible. same for the XQMAKESPEC override read from
.qmake.cache and the environment variable.
the cleaner solution would be adding -hostspec, to be symmetrical with
the override semantics, but that would deviate from configure in turn.

Change-Id: I4297c873780af16ab7928421b434ce0f1d3820da
Reviewed-by: Joerg Bornemann <joerg.bornemann@nokia.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/qmake/project.h b/qmake/project.h
index ccdc1b63f1..700509b2a6 100644
--- a/qmake/project.h
+++ b/qmake/project.h
@@ -79,6 +79,8 @@ class QMakeProject
     QHash<QString, FunctionBlock*> testFunctions, replaceFunctions;
 
     bool recursive;
+    bool host_build;
+    bool need_restart;
     bool own_prop;
     bool backslashWarned;
     QString pfile;
@@ -107,6 +109,7 @@ class QMakeProject
     bool doVariableReplace(QString &str, QHash<QString, QStringList> &place);
     QStringList doVariableReplaceExpand(const QString &str, QHash<QString, QStringList> &place, bool *ok=0);
     void init(QMakeProperty *);
+    void cleanup();
     QStringList &values(const QString &v, QHash<QString, QStringList> &place);
     void validateModes();
     void resolveSpec(QString *spec, const QString &qmakespec);
@@ -160,6 +163,7 @@ public:
     QHash<QString, QStringList> &variables(); // No compat mapping and magic, obviously
 
     bool isRecursive() const { return recursive; }
+    bool isHostBuild() const { return host_build; }
 
 protected:
     friend class MakefileGenerator;