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, 3 insertions, 0 deletions

diff --git a/qmake/generators/unix/unixmake.h b/qmake/generators/unix/unixmake.h
index db3f59f517..17270ffce9 100644
--- a/qmake/generators/unix/unixmake.h
+++ b/qmake/generators/unix/unixmake.h
@@ -52,6 +52,9 @@ public:
 protected:
     virtual bool doPrecompiledHeaders() const { return project->isActiveConfig("precompile_header"); }
     virtual bool doDepends() const { return !Option::mkfile::do_stub_makefile && MakefileGenerator::doDepends(); }
+#ifdef Q_OS_WIN // MinGW x-compiling for QNX
+    virtual QString installRoot() const;
+#endif
     virtual QString defaultInstall(const QString &);
     virtual ProString fixLibFlag(const ProString &lib);