qmake: rewrite msvc/nmake cross-build environment setup

rather than reproducing vcvarsall.bat's functionality as hard-wired code
in the nmake generator, just invoke the actual script from
toolchain.prf. this is much easier, more future proof, and - critically
- makes the detected variables available to configure's new library &
header search facilities.

[ChangeLog][Important Behavior Changes][qmake][WinRT] Cross-builds will
now ignore pre-set values of %INCLUDE% and %LIB% when building target
executables. If necessary, use configure's -I and -L switches when
building Qt, and pass QMAKE_INCDIR and QMAKE_LIBDIR on qmake's command
line when building own projects.

Change-Id: I36f53e8880d6523f3f6f7a44d40d87d04bd06854
Reviewed-by: Thomas Miller <thomaslmiller91@gmail.com>
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>

1 files changed, 44 insertions, 0 deletions

diff --git a/mkspecs/features/data/dumpvcvars.bat b/mkspecs/features/data/dumpvcvars.bat
new file mode 100644
index 0000000000..4721da2e39
--- /dev/null
+++ b/mkspecs/features/data/dumpvcvars.bat
@@ -0,0 +1,44 @@
+:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::
+:: Copyright (C) 2018 The Qt Company Ltd.
+:: Contact: https://www.qt.io/licensing/
+::
+:: This file is part of the tools applications of the Qt Toolkit.
+::
+:: $QT_BEGIN_LICENSE:GPL-EXCEPT$
+:: Commercial License Usage
+:: Licensees holding valid commercial Qt licenses may use this file in
+:: accordance with the commercial license agreement provided with the
+:: Software or, alternatively, in accordance with the terms contained in
+:: a written agreement between you and The Qt Company. For licensing terms
+:: and conditions see https://www.qt.io/terms-conditions. For further
+:: information use the contact form at https://www.qt.io/contact-us.
+::
+:: GNU General Public License Usage
+:: Alternatively, this file may be used under the terms of the GNU
+:: General Public License version 3 as published by the Free Software
+:: Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+:: included in the packaging of this file. Please review the following
+:: information to ensure the GNU General Public License requirements will
+:: be met: https://www.gnu.org/licenses/gpl-3.0.html.
+::
+:: $QT_END_LICENSE$
+::
+:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+
+@echo off
+
+REM We clear INCLUDE and LIB, because we want to obtain pristine values.
+REM PATH cannot be cleared, because then the script does not even run,
+REM and it would be counterproductive anyway (see toolchain.prf).
+set INCLUDE=
+set LIB=
+
+call %* || exit 1
+REM VS2015 does not set errorlevel in case of failure.
+if "%INCLUDE%" == "" exit 1
+
+echo =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=
+echo %INCLUDE%
+echo %LIB%
+echo %PATH%