[Bug 795766] New: [bad] Compilation fails on GCC 8.0.1

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=795766

            Bug ID: 795766
           Summary: [bad] Compilation fails on GCC 8.0.1
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: major
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: ullysses.a.eoff at intel.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

gstreamer (master) heads/master-0-g98200ddd8dfd 
gst-plugins-base (master) heads/master-0-gdbd9ff1cf510 
gst-plugins-good (master) heads/master-0-gae1c2b0c674f 
gst-plugins-bad (master) heads/master-0-ge1a90f1ec998

With GCC 8.0.1 (default on recent Fedora 28 release), gst-plugins-bad fails to
compile:

In file included from /opt/media/install/include/gstreamer-1.0/gst/gst.h:90,
                 from gstopencvutils.h:29,
                 from gstopencvutils.cpp:26:
/opt/media/install/include/gstreamer-1.0/gst/gstutils.h: In function 'gdouble
GDOUBLE_SWAP_LE_BE(gdouble)':
/opt/media/install/include/gstreamer-1.0/gst/gstutils.h:597:5: error:
conflicting C language linkage declaration
'GDOUBLE_SWAP_LE_BE(gdouble)::<unnamed union> u' [-Werror]
   } u;
     ^
/opt/media/install/include/gstreamer-1.0/gst/gstutils.h:575:5: note: previous
declaration 'GFLOAT_SWAP_LE_BE(gfloat)::<unnamed union> u'
   } u;
     ^
/opt/media/install/include/gstreamer-1.0/gst/gstutils.h: In function 'gfloat
GST_READ_FLOAT_LE(const guint8*)':
/opt/media/install/include/gstreamer-1.0/gst/gstutils.h:700:5: error:
conflicting C language linkage declaration 'GST_READ_FLOAT_LE(const
guint8*)::<unnamed union> u' [-Werror]
   } u;
     ^
/opt/media/install/include/gstreamer-1.0/gst/gstutils.h:575:5: note: previous
declaration 'GFLOAT_SWAP_LE_BE(gfloat)::<unnamed union> u'
   } u;
     ^
/opt/media/install/include/gstreamer-1.0/gst/gstutils.h: In function 'gfloat
GST_READ_FLOAT_BE(const guint8*)':
/opt/media/install/include/gstreamer-1.0/gst/gstutils.h:721:5: error:
conflicting C language linkage declaration 'GST_READ_FLOAT_BE(const
guint8*)::<unnamed union> u' [-Werror]
   } u;
     ^
/opt/media/install/include/gstreamer-1.0/gst/gstutils.h:575:5: note: previous
declaration 'GFLOAT_SWAP_LE_BE(gfloat)::<unnamed union> u'
   } u;
     ^
/opt/media/install/include/gstreamer-1.0/gst/gstutils.h: In function 'gdouble
GST_READ_DOUBLE_LE(const guint8*)':
/opt/media/install/include/gstreamer-1.0/gst/gstutils.h:742:5: error:
conflicting C language linkage declaration 'GST_READ_DOUBLE_LE(const
guint8*)::<unnamed union> u' [-Werror]
   } u;
     ^
/opt/media/install/include/gstreamer-1.0/gst/gstutils.h:575:5: note: previous
declaration 'GFLOAT_SWAP_LE_BE(gfloat)::<unnamed union> u'
   } u;
     ^
/opt/media/install/include/gstreamer-1.0/gst/gstutils.h: In function 'gdouble
GST_READ_DOUBLE_BE(const guint8*)':
/opt/media/install/include/gstreamer-1.0/gst/gstutils.h:763:5: error:
conflicting C language linkage declaration 'GST_READ_DOUBLE_BE(const
guint8*)::<unnamed union> u' [-Werror]
   } u;
     ^
/opt/media/install/include/gstreamer-1.0/gst/gstutils.h:575:5: note: previous
declaration 'GFLOAT_SWAP_LE_BE(gfloat)::<unnamed union> u'
   } u;
     ^
/opt/media/install/include/gstreamer-1.0/gst/gstutils.h: In function 'void
GST_WRITE_FLOAT_LE(guint8*, gfloat)':
/opt/media/install/include/gstreamer-1.0/gst/gstutils.h:783:5: error:
conflicting C language linkage declaration 'GST_WRITE_FLOAT_LE(guint8*,
gfloat)::<unnamed union> u' [-Werror]
   } u;
     ^
/opt/media/install/include/gstreamer-1.0/gst/gstutils.h:575:5: note: previous
declaration 'GFLOAT_SWAP_LE_BE(gfloat)::<unnamed union> u'
   } u;
     ^
/opt/media/install/include/gstreamer-1.0/gst/gstutils.h: In function 'void
GST_WRITE_FLOAT_BE(guint8*, gfloat)':
/opt/media/install/include/gstreamer-1.0/gst/gstutils.h:803:5: error:
conflicting C language linkage declaration 'GST_WRITE_FLOAT_BE(guint8*,
gfloat)::<unnamed union> u' [-Werror]
   } u;
     ^
/opt/media/install/include/gstreamer-1.0/gst/gstutils.h:575:5: note: previous
declaration 'GFLOAT_SWAP_LE_BE(gfloat)::<unnamed union> u'
   } u;
     ^
/opt/media/install/include/gstreamer-1.0/gst/gstutils.h: In function 'void
GST_WRITE_DOUBLE_LE(guint8*, gdouble)':
/opt/media/install/include/gstreamer-1.0/gst/gstutils.h:823:5: error:
conflicting C language linkage declaration 'GST_WRITE_DOUBLE_LE(guint8*,
gdouble)::<unnamed union> u' [-Werror]
   } u;
     ^
/opt/media/install/include/gstreamer-1.0/gst/gstutils.h:575:5: note: previous
declaration 'GFLOAT_SWAP_LE_BE(gfloat)::<unnamed union> u'
   } u;
     ^
/opt/media/install/include/gstreamer-1.0/gst/gstutils.h: In function 'void
GST_WRITE_DOUBLE_BE(guint8*, gdouble)':
/opt/media/install/include/gstreamer-1.0/gst/gstutils.h:843:5: error:
conflicting C language linkage declaration 'GST_WRITE_DOUBLE_BE(guint8*,
gdouble)::<unnamed union> u' [-Werror]
   } u;
     ^
/opt/media/install/include/gstreamer-1.0/gst/gstutils.h:575:5: note: previous
declaration 'GFLOAT_SWAP_LE_BE(gfloat)::<unnamed union> u'
   } u;
     ^
cc1plus: all warnings being treated as errors

Can workaround with --disable-fatal-warnings.

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