Work around MinGW-make's magic prefixing of paths.

When building QNX on MS-Windows, make magically adds the Msys root as
prefix to variables whose values look like paths; this applies to both
environment variables and variables given values on the command-line.
When we don't actually want to install under the Msys root, this is
unwelcome "help".  So (for MinGW's make) support a magic prefix of our
own, @msyshack@, that'll make a path value for INSTALL_ROOT not look
like a path to make; we can then strip it off when we come to use it.

Change-Id: I951ad3c8fe3e5cfb49e6e361d7fff779f3a9d716
Reviewed-by: Jędrzej Nowacki <jedrzej.nowacki@theqtcompany.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@theqtcompany.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/qmake/generators/makefile.h b/qmake/generators/makefile.h
index 97159eaef4..19ff5d57a3 100644
--- a/qmake/generators/makefile.h
+++ b/qmake/generators/makefile.h
@@ -192,6 +192,7 @@ protected:
 
     //for installs
     virtual QString defaultInstall(const QString &);
+    virtual QString installRoot() const;
 
     //for prl
     QString prlFileName(bool fixify=true);
@@ -277,6 +278,9 @@ inline bool MakefileGenerator::noIO() const
 inline QString MakefileGenerator::defaultInstall(const QString &)
 { return QString(""); }
 
+inline QString MakefileGenerator::installRoot() const
+{ return QStringLiteral("$(INSTALL_ROOT)"); }
+
 inline bool MakefileGenerator::findLibraries(bool, bool)
 { return true; }