We like to build glibmm and other C++ packages with compiler flags
  -pedantic -Wall -Wextra -Wformat-security -Wno-long-long -Werror

Such builds now fail due to an extra comma in glib/glib/gtestutils.h.

typedef enum {
  G_TEST_SUBPROCESS_INHERIT_STDIN  = 1 << 0,
  G_TEST_SUBPROCESS_INHERIT_STDOUT = 1 << 1,
  G_TEST_SUBPROCESS_INHERIT_STDERR = 1 << 2,
} GTestSubprocessFlags;

According to pedantic C and C++, the comma after the last entry in the enum
definition is not allowed.

Excerpt from the compilation error messages when glibmm is built:

/opt/gnome/include/glib-2.0/glib/gtestutils.h:183:44: error: comma at end of enumerator list [-Werror=edantic]
cc1plus: all warnings being treated as errors

This enum was added with this commit:
https://git.gnome.org/browse/glib/commit/?id=960f5500e22d505a5dccbff51ccbc8ab969f0851

   Build date and platform:
Ubuntu 12.04. Source code of glib from git's master branch,
built with jhbuild on 2013-06-02.