They are added by the binutils gold linker.
#! /bin/sh
cpp -DINCLUDE_VARIABLES -P -DALL_FILES ${srcdir:-.}/gdk-pixbuf.symbols | sed -e '/^$/d' -e 's/ G_GNUC.*$//' -e 's/ PRIVATE$//' | sort > expected-abi
-nm -D -g --defined-only .libs/libgdk_pixbuf-3.0.so | cut -d ' ' -f 3 | sort > actual-abi
+nm -D -g --defined-only .libs/libgdk_pixbuf-3.0.so | cut -d ' ' -f 3 | egrep -v '^(__bss_start|_edata|_end)' | sort > actual-abi
diff -u expected-abi actual-abi && rm -f expected-abi actual-abi
#! /bin/sh
cpp -DINCLUDE_VARIABLES -P -DALL_FILES -DGDK_ENABLE_BROKEN -DGDK_WINDOWING_X11 ${srcdir:-.}/gdk.symbols | sed -e '/^$/d' -e 's/ G_GNUC.*$//' | sort | uniq > expected-abi
-nm -D -g --defined-only .libs/libgdk-x11-3.0.so | cut -d ' ' -f 3 | sort > actual-abi
+nm -D -g --defined-only .libs/libgdk-x11-3.0.so | cut -d ' ' -f 3 | egrep -v '^(__bss_start|_edata|_end)' | sort > actual-abi
diff -u expected-abi actual-abi && rm -f expected-abi actual-abi
#! /bin/sh
cpp -DINCLUDE_VARIABLES -P -DG_OS_UNIX -DGTK_WINDOWING_X11 -DALL_FILES ${srcdir:-.}/gtk.symbols | sed -e '/^$/d' -e 's/ G_GNUC.*$//' -e 's/ PRIVATE//' | sort > expected-abi
-nm -D -g --defined-only .libs/libgtk-x11-3.0.so | cut -d ' ' -f 3 | sort > actual-abi
+nm -D -g --defined-only .libs/libgtk-x11-3.0.so | cut -d ' ' -f 3 | egrep -v '^(__bss_start|_edata|_end)' | sort > actual-abi
diff -u expected-abi actual-abi && rm -f expected-abi actual-abi