[Bug 676846] New: CFLAGS are reset when compiling with --enable-gcov.

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=676846
  GStreamer | common | git

           Summary: CFLAGS are reset when compiling with --enable-gcov.
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: common
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: sebras at hotmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


If I try to compile my own gst-plugin and set/unset
features in, or include headers by setting compiler 
flags in CFLAGS when compiling like so:

CFLAGS="-DUSE_COOL_FEATURE -I/home/sebrn/src/downstream/include" make

Then the plugin will compile successfully. If I attempt
to do the same while compiling with gcov enabled (by
suppling --enable-gcov to configure) it will fail.
This means that it is impossible to override or append
new compiler flags using CFLAGS from the command-line.

The reason is that in the AG_GST_ARG_GCOV function in
common/m4/gst-args.m4 reset the value of CFLAGS (and 
others) instead of simply appending -O0. Glib handles
this by appending -O0, and therefore I propose that
GStreamer do the same. Then CFLAGS can again be used
to override/append compiler flags if so desired.

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