Add support for wine+mingw environments

README.md

@@ -279,3 +279,55 @@ pip3 install meson
 Note that Meson is written entirely in Python, so you can also run it as-is
 from the [git repository](https://github.com/mesonbuild/meson/) if you want to
 use the latest master branch for some reason.
+
+
+### Setup a mingw/wine based development environment on linux
+
+#### Install wine and mingw
+
+##### On fedora x64
+
+``` sh
+sudo dnf install mingw64-gcc mingw64-gcc-c++ mingw64-pkg-config mingw64-winpthreads wine
+```
+
+FIXME: Figure out what needs to be installed on other distros
+
+#### Get meson from git
+
+This simplifies the process and allows us to use the cross files
+defined in meson itself.
+
+``` sh
+git clone https://github.com/mesonbuild/meson.git
+```
+
+#### Build and install
+
+```
+BUILDDIR=$PWD/winebuild/
+export WINEPREFIX=$BUILDDIR/wine-prefix/ && mkdir -p $WINEPREFIX
+# Setting the prefix is mandatory as it is used to setup symlinks during uninstalled development
+meson/meson.py $BUILDDIR --cross-file meson/cross/linux-mingw-w64-64bit.txt -Dgst-plugins-bad:vulkan=disabled -Dorc:gtk_doc=disabled --prefix=$BUILDDIR/wininstall/ -Djson-glib:gtk_doc=disabled
+meson/meson.py install -C $BUILDDIR/
+```
+
+> __NOTE__: You should use `meson install -C $BUILDDIR`  each time you make a change
+> instead of the usual `ninja -C build` as the environment is not uninstalled.
+
+#### The development environment
+
+You can get into the development environment the usual way:
+
+```
+ninja -C $BUILDDIR/ devenv
+```
+
+After setting up [binfmt] to use wine for windows binaries,
+you can run GStreamer tools under wine by running:
+
+```
+gst-launch-1.0.exe videotestsrc ! glimagesink
+```
+
+[binfmt]: http://man7.org/linux/man-pages/man5/binfmt.d.5.html

gst-env.py

@@ -19,6 +19,7 @@ from distutils.util import strtobool
 from scripts.common import get_meson
 from scripts.common import git
 from scripts.common import win32_get_short_path_name
+from scripts.common import get_wine_shortpath
 
 SCRIPTDIR = os.path.dirname(os.path.realpath(__file__))
 PREFIX_DIR = os.path.join(SCRIPTDIR, 'prefix')
@@ -88,29 +89,53 @@ def is_library_target_and_not_plugin(target, filename):
     return True
 
 
+def get_wine_subprocess_env(options, env):
+    with open(os.path.join(options.builddir, 'meson-info', 'intro-buildoptions.json')) as f:
+        buildoptions = json.load(f)
+
+    prefix, = [o for o in buildoptions if o['name'] == 'prefix']
+    path = os.path.normpath(os.path.join(prefix['value'], 'bin'))
+    prepend_env_var(env, "PATH", path, options.sysroot)
+    wine_path = get_wine_shortpath(
+        options.wine.split(' '),
+        [path] + env.get('WINEPATH', '').split(';')
+    )
+    if options.winepath:
+        wine_path += ';' + options.winepath
+    env['WINEPATH'] = wine_path
+    env['WINEDEBUG'] = 'fixme-all'
+
+    return env
+
+
 def get_subprocess_env(options, gst_version):
     env = os.environ.copy()
 
     env["CURRENT_GST"] = os.path.normpath(SCRIPTDIR)
+    env["GST_VERSION"] = gst_version
     env["GST_VALIDATE_SCENARIOS_PATH"] = os.path.normpath(
         "%s/subprojects/gst-devtools/validate/data/scenarios" % SCRIPTDIR)
     env["GST_VALIDATE_PLUGIN_PATH"] = os.path.normpath(
         "%s/subprojects/gst-devtools/validate/plugins" % options.builddir)
     env["GST_VALIDATE_APPS_DIR"] = os.path.normpath(
         "%s/subprojects/gst-editing-services/tests/validate" % SCRIPTDIR)
+    env["GST_ENV"] = 'gst-' + gst_version
+    env["GST_REGISTRY"] = os.path.normpath(options.builddir + "/registry.dat")
     prepend_env_var(env, "PATH", os.path.normpath(
         "%s/subprojects/gst-devtools/validate/tools" % options.builddir),
         options.sysroot)
+
+    if options.wine:
+        return get_wine_subprocess_env(options, env)
+
     prepend_env_var(env, "PATH", os.path.join(SCRIPTDIR, 'meson'),
         options.sysroot)
-    env["GST_VERSION"] = gst_version
-    env["GST_ENV"] = 'gst-' + gst_version
+
     env["GST_PLUGIN_SYSTEM_PATH"] = ""
     env["GST_PLUGIN_SCANNER"] = os.path.normpath(
         "%s/subprojects/gstreamer/libs/gst/helpers/gst-plugin-scanner" % options.builddir)
     env["GST_PTP_HELPER"] = os.path.normpath(
         "%s/subprojects/gstreamer/libs/gst/helpers/gst-ptp-helper" % options.builddir)
-    env["GST_REGISTRY"] = os.path.normpath(options.builddir + "/registry.dat")
 
     if os.name is 'nt':
         lib_path_envvar = 'PATH'
@@ -285,6 +310,12 @@ if __name__ == "__main__":
     parser.add_argument("--sysroot",
                         default='',
                         help="The sysroot path used during cross-compilation")
+    parser.add_argument("--wine",
+                        default='',
+                        help="Build a wine env based on specified wine command")
+    parser.add_argument("--winepath",
+                        default='',
+                        help="Exra path to set to WINEPATH.")
     options, args = parser.parse_known_args()
 
     if not os.path.exists(options.builddir):
@@ -302,6 +333,9 @@ if __name__ == "__main__":
     gst_version = git("rev-parse", "--symbolic-full-name", "--abbrev-ref", "HEAD",
                       repository_path=options.srcdir).strip('\n')
 
+    if options.wine:
+        gst_version += '-' + os.path.basename(options.wine)
+
     if not args:
         if os.name is 'nt':
             shell = get_windows_shell()

gst-uninstalled.py

@@ -0,0 +1 @@
+gst-env.py

meson.build

@@ -172,6 +172,16 @@ setenv = find_program('gst-env.py')
 devenv_cmd = [setenv, '--builddir=@0@'.format(meson.build_root()),
               '--srcdir=@0@'.format(meson.source_root())]
 
+if meson.has_exe_wrapper() and build_machine.system() == 'linux' and host_machine.system() == 'windows'
+  # FIXME: Ideally we could get the wrapper directly from meson
+  devenv_cmd += ['--wine', host_machine.cpu_family() == 'x86_64' ? 'wine64' : 'wine32']
+  sysroot = meson.get_cross_property('sys_root')
+  if sysroot != ''
+    # Logic from meson
+    devenv_cmd += ['--winepath', 'Z:' + join_paths(sysroot, 'bin')]
+  endif
+endif
+
 run_target('uninstalled', command : devenv_cmd)
 run_target('devenv', command : devenv_cmd)
 

scripts/common.py

@@ -5,6 +5,7 @@ import shutil
 import argparse
 import platform
 import subprocess
+import uuid
 
 
 ROOTDIR = os.path.abspath(os.path.dirname(__file__))
@@ -31,6 +32,33 @@ def win32_get_short_path_name(long_name):
         else:
             output_buf_size = needed
 
+
+def get_wine_shortpath(winecmd, wine_paths):
+    seen = set()
+    wine_paths += [p for p in wine_paths if not (p in seen or seen.add(p))]
+
+    getShortPathScript = '%s.bat' % str(uuid.uuid4()).lower()[:5]
+    with open(getShortPathScript, mode='w') as f:
+        f.write("@ECHO OFF\nfor %%x in (%*) do (\n echo|set /p=;%~sx\n)\n")
+        f.flush()
+    try:
+        with open(os.devnull, 'w') as stderr:
+            wine_path = subprocess.check_output(
+                winecmd +
+                ['cmd', '/C', getShortPathScript] + wine_paths,
+                stderr=stderr).decode('utf-8')
+    except subprocess.CalledProcessError as e:
+        print("Could not get short paths: %s" % e)
+        wine_path = ';'.join(wine_paths)
+    finally:
+        os.remove(getShortPathScript)
+    if len(wine_path) > 2048:
+        raise AssertionError('WINEPATH size {} > 2048'
+                                ' this will cause random failure.'.format(
+                                    len(wine_path)))
+    return wine_path
+
+
 class Colors:
     HEADER = '\033[95m'
     OKBLUE = '\033[94m'