gst-plugins-good构建失败并出现错误：‘GLsync’尚未声明

Question

当我在另一台ARM机器上为Raspberry Pi构建gst-plugins-good==1.16.2时，Qt插件构建失败。

我成功地构建了gstreamer==1.16.2、gst-plugins-base==1.16.2和qtbase==5.13.2，但它们似乎与gst-plugins-good==1.16.2不兼容

In file included from gstqtgl.h:32:0,
                 from qtwindow.h:27,
                 from moc_qtwindow.cc:10:
/build/snaps/full/stage/include/gstreamer-1.0/gst/gl/gstglfuncs.h:93:17: error: expected identifier before ‘*’ token
   ret (GSTGLAPI *name) args;
                 ^
/build/snaps/full/stage/include/gstreamer-1.0/gst/gl/glprototypes/sync.h:27:1: note: in expansion of macro ‘GST_GL_EXT_FUNCTION’
 GST_GL_EXT_FUNCTION (GLsync, FenceSync,
 ^
/build/snaps/full/stage/include/gstreamer-1.0/gst/gl/glprototypes/sync.h:29:39: error: ISO C++ forbids declaration of ‘GLsync’ with no type [-fpermissive]
                       GLbitfield flags))
                                       ^
/build/snaps/full/stage/include/gstreamer-1.0/gst/gl/gstglfuncs.h:93:24: note: in definition of macro ‘GST_GL_EXT_FUNCTION’
   ret (GSTGLAPI *name) args;
                        ^
/build/snaps/full/stage/include/gstreamer-1.0/gst/gl/glprototypes/sync.h:29:39: error: ‘GLsync’ declared as function returning a function
                       GLbitfield flags))
                                       ^
/build/snaps/full/stage/include/gstreamer-1.0/gst/gl/gstglfuncs.h:93:24: note: in definition of macro ‘GST_GL_EXT_FUNCTION’
   ret (GSTGLAPI *name) args;
                        ^
/build/snaps/full/stage/include/gstreamer-1.0/gst/gl/glprototypes/sync.h:31:23: error: ‘GLsync’ has not been declared
                      (GLsync sync))
                       ^
/build/snaps/full/stage/include/gstreamer-1.0/gst/gl/gstglfuncs.h:93:24: note: in definition of macro ‘GST_GL_EXT_FUNCTION’
   ret (GSTGLAPI *name) args;
                        ^
/build/snaps/full/stage/include/gstreamer-1.0/gst/gl/glprototypes/sync.h:33:23: error: ‘GLsync’ has not been declared
                      (GLsync sync))
                       ^
/build/snaps/full/stage/include/gstreamer-1.0/gst/gl/gstglfuncs.h:93:24: note: in definition of macro ‘GST_GL_EXT_FUNCTION’
   ret (GSTGLAPI *name) args;
                        ^
/build/snaps/full/stage/include/gstreamer-1.0/gst/gl/glprototypes/sync.h:35:23: error: ‘GLsync’ has not been declared
                      (GLsync sync,
                       ^
/build/snaps/full/stage/include/gstreamer-1.0/gst/gl/gstglfuncs.h:93:24: note: in definition of macro ‘GST_GL_EXT_FUNCTION’
   ret (GSTGLAPI *name) args;
                        ^
/build/snaps/full/stage/include/gstreamer-1.0/gst/gl/glprototypes/sync.h:39:23: error: ‘GLsync’ has not been declared
                      (GLsync sync,
                       ^
/build/snaps/full/stage/include/gstreamer-1.0/gst/gl/gstglfuncs.h:93:24: note: in definition of macro ‘GST_GL_EXT_FUNCTION’
   ret (GSTGLAPI *name) args;
                        ^
/build/snaps/full/stage/include/gstreamer-1.0/gst/gl/glprototypes/sync.h:43:23: error: ‘GLsync’ has not been declared
                      (GLsync sync,
                       ^
/build/snaps/full/stage/include/gstreamer-1.0/gst/gl/gstglfuncs.h:93:24: note: in definition of macro ‘GST_GL_EXT_FUNCTION’
   ret (GSTGLAPI *name) args;
                        ^
Makefile:881: recipe for target 'libgstqmlgl_la-moc_gstqsgtexture.lo' failed

我在https://bugzilla.gnome.org/show_bug.cgi?id=796879中看到了一个非常类似的问题，但在我的代码中，他们想要删除的行已经丢失了。

相反，我从ext/qt/gstqtgl.h中删除了#define GST_GL_HAVE_GLSYNC 1，编译成功。

但是该行上面的注释说它应该使用Qt的GLsync定义，这样我的“修复”看起来就不正确了。

我仍然在努力为这个问题找到一个合适的解决方案。

Answer 1

我发现，当你在Raspberry Pi设备上使用补丁时，它不会破坏任何东西。

diff -Naur ./src/ext/qt/gstqtgl.h ./src2/ext/qt/gstqtgl.h
--- ./ext/qt/gstqtgl.h      2019-04-19 09:16:25.000000000 +0000
+++ ./ext/qt/gstqtgl.h      2019-12-15 09:22:22.503065057 +0000
@@ -28,7 +28,6 @@
  * that we don't typedef GLsync in gstglfuncs.h */
 #include <gst/gl/gstglconfig.h>
 #undef GST_GL_HAVE_GLSYNC
-#define GST_GL_HAVE_GLSYNC 1
 #include <gst/gl/gstglfuncs.h>

 /* The glext.h guard was renamed in 2018, but some software which

我希望这对有麻烦的人有帮助。

如果有什么问题，我会更新这篇文章。