warnings in 21.4.9 compile

I noticed this: gcc -g -O3 -mcpu=athlon -march=athlon -c -g -O3 -Wall -Wno-switch -Winline -Wmissing-prototypes -Wsign-compare -Wshadow -Demacs -I. -DHAVE_CONFIG_H -I/usr/X11R6/include data.c data.c: In function `dead_wrong_type_argument': data.c:117: warning: `noreturn' function does return data.c: In function `args_out_of_range': data.c:147: warning: `noreturn' function does return data.c: In function `args_out_of_range_3': data.c:153: warning: `noreturn' function does return gcc -g -O3 -mcpu=athlon -march=athlon -c -g -O3 -Wall -Wno-switch -Winline -Wmissing-prototypes -Wsign-compare -Wshadow -Demacs -I. -DHAVE_CONFIG_H -I/usr/X11R6/include postgresql.c In file included from postgresql.h:16, from postgresql.c:102: /usr/include/libpq-fe.h:115: warning: declaration of `message' shadows global declaration gcc -g -O3 -mcpu=athlon -march=athlon -c -g -O3 -Wall -Wno-switch -Winline -Wmissing-prototypes -Wsign-compare -Wshadow -Demacs -I. -DHAVE_CONFIG_H -I/usr/X11R6/include toolbar-x.c In file included from /usr/X11R6/include/Xm/PrimitiveP.h:50, from xmprimitivep.h:31, from EmacsFrameP.h:30, from toolbar-x.c:35: /usr/X11R6/include/Xm/XmP.h:1241: warning: declaration of `message' shadows global declaration gcc -g -O3 -mcpu=athlon -march=athlon -c -g -O3 -Wall -Wno-switch -Winline -Wmissing-prototypes -Wsign-compare -Wshadow -Demacs -I. -DHAVE_CONFIG_H -I/usr/X11R6/include process-unix.c process-unix.c: In function `unix_canonicalize_host_name': process-unix.c:1606: warning: declaration of `gai_error' shadows global declaration process-unix.c: In function `unix_open_network_stream': process-unix.c:1698: warning: declaration of `gai_error' shadows global declaration gcc -g -O3 -mcpu=athlon -march=athlon -c -g -O3 -Wall -Wno-switch -Winline -Wmissing-prototypes -Wsign-compare -Wshadow -Demacs -I. -DHAVE_CONFIG_H -I/usr/X11R6/include extents.c extents.c: In function `print_extent_1': extents.c:2964: warning: int format, Lisp_Object arg (arg 3) extents.c:2964: warning: int format, Lisp_Object arg (arg 4) gcc -g -O3 -mcpu=athlon -march=athlon -c -g -O3 -Wall -Wno-switch -Winline -Wmissing-prototypes -Wsign-compare -Wshadow -Demacs -I. -DHAVE_CONFIG_H -I/usr/X11R6/include fileio.c fileio.c: In function `report_file_error': fileio.c:172: warning: `noreturn' function does return fileio.c: In function `signal_file_error': fileio.c:195: warning: `noreturn' function does return fileio.c: In function `signal_double_file_error': fileio.c:217: warning: `noreturn' function does return fileio.c: In function `signal_double_file_error_2': fileio.c:242: warning: `noreturn' function does return gcc -g -O3 -mcpu=athlon -march=athlon -c -g -O3 -Wall -Wno-switch -Winline -Wmissing-prototypes -Wsign-compare -Wshadow -Demacs -I. -DHAVE_CONFIG_H -I/usr/X11R6/include glyphs.c glyphs.c: In function `signal_image_error': glyphs.c:2146: warning: `noreturn' function does return glyphs.c: In function `signal_image_error_2': glyphs.c:2153: warning: `noreturn' function does return In file included from glyphs-eimage.c:67: /usr/include/png.h:1814: warning: declaration of `error' shadows global declaration /usr/include/png.h:1818: warning: declaration of `error' shadows global declaration /usr/include/png.h:1822: warning: declaration of `message' shadows global declaration /usr/include/png.h:1826: warning: declaration of `message' shadows global declaration gcc -g -O3 -mcpu=athlon -march=athlon -c -g -O3 -Wall -Wno-switch -Winline -Wmissing-prototypes -Wsign-compare -Wshadow -Demacs -I. -DHAVE_CONFIG_H -I/usr/X11R6/include select-x.c In file included from /usr/X11R6/include/Xm/DragC.h:48, from /usr/X11R6/include/Xm/Transfer.h:44, from /usr/X11R6/include/Xm/Xm.h:62, from /usr/X11R6/include/Xm/CutPaste.h:47, from select-x.c:45: /usr/X11R6/include/Xm/Display.h:81: warning: declaration of `time' shadows global declaration There are numerous warnings about signed/unsigned, but these are typically harmless.