21.5.28: warnings at configuration and building

When I configure and build 21.5.28 on a Fedora-6 system, fully updated, I get a few warnings both from configure and from compilation. The resulting program seems to run OK, but you indicated that you wanted reports also about warnings. There are a few issues with the finished program, but I will put them in separate messages. I will put a condensed version of the warnings in this message, and the complete logs will be available at http://www.control.lth.se/user/leif.andersson/xemacs-21.5.28/ The configure command line is: --------------------------------------------------- VERSION=21.5.28 BASEDIR=/opt/xemacs BUILDDIR=`pwd` ../xemacs-21.5.28/configure \ --prefix=$BASEDIR/xemacs-$VERSION \ --with-prefix=no \ --with-ldap=no \ --with-gnome=yes \ --with-msw=no \ --with-file-coding=yes \ --enable-database=no \ --with-mule=yes \ --with-canna=no \ --with-xim=no \ --with-wnn=no \ --with-default-eol-detection=yes \ --with-optimization=yes \ --with-error-checking=yes \ --with-athena=3d \ --with-xft=emacs \ ========================================================== The configure warnings are (lines broken by mailer): ----------------------------------------- configure: creating ./config.status config.status: creating Makefile.in config.status: WARNING: /tmp/leif/xemacs-21.5.28/Makefile.in.in seems to ignore the --datarootdir setting config.status: creating lib-src/Makefile.in config.status: WARNING: /tmp/leif/xemacs-21.5.28/lib-src/Makefile.in.in seems to ignore the --datarootdir setting config.status: creating lwlib/Makefile.in config.status: creating src/Makefile.in config.status: creating src/paths.h config.status: creating src/xemacs.def.in config.status: creating lib-src/config.values config.status: WARNING: /tmp/leif/xemacs-21.5.28/lib-src/config.values.in seems to ignore the --datarootdir setting config.status: creating lib-src/ellcc.h config.status: creating src/config.h config.status: creating lwlib/config.h config.status: executing default commands ============================================================== A few of the compilation warnings are: ----------------------------------- gcc -Wall -Wno-switch -Wundef -Wsign-compare -Wno-char-subscripts -Wpacked -Wdeclaration-after-statement -Wshadow -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -g -O3 -I. -I../src -I/tmp/leif/xemacs-21.5.28/lib-src -I/tmp/leif/xemacs-21.5.28/src -DHAVE_CONFIG_H -I/usr/include/freetype2 -DVERSION='"21.5-b28"' /tmp/leif/xemacs-21.5.28/lib-src/ootags.c getopt.o getopt1.o regex.o -lgpm -lncurses -lasound -lm -lutil -o ootags /tmp/leif/xemacs-21.5.28/lib-src/ootags.c: In function 'C_entries': /tmp/leif/xemacs-21.5.28/lib-src/ootags.c:2642: warning: 'savetok.buffer' may be used uninitialized in this function /tmp/leif/xemacs-21.5.28/lib-src/ootags.c:2642: warning: 'savetok.linepos' may be used uninitialized in this function /tmp/leif/xemacs-21.5.28/lib-src/ootags.c:2642: warning: 'savetok.lineno' may be used uninitialized in this function /tmp/leif/xemacs-21.5.28/lib-src/ootags.c:2642: warning: 'savetok.linelen' may be used uninitialized in this function /tmp/leif/xemacs-21.5.28/lib-src/ootags.c:2642: warning: 'savetok.named' may be used uninitialized in this function /tmp/leif/xemacs-21.5.28/lib-src/ootags.c:2642: warning: 'savetok.str' may be used uninitialized in this function ========================================================================== ----------------------------------------------------------------------- gcc -c -Wall -Wno-switch -Wundef -Wsign-compare -Wno-char-subscripts -Wpacked -Wunused-parameter -g -O3 -Demacs -I. -I/tmp/leif/xemacs-21.5.28/src -DHAVE_CONFIG_H -I/usr/include/freetype2 /tmp/leif/xemacs-21.5.28/src/console.c /tmp/leif/xemacs-21.5.28/src/console.c: In function 'Fset_input_mode': /tmp/leif/xemacs-21.5.28/src/console.c:1146: warning: dereferencing type-punned pointer will break strict-aliasing rules /tmp/leif/xemacs-21.5.28/src/console.c:1147: warning: dereferencing type-punned pointer will break strict-aliasing rules /tmp/leif/xemacs-21.5.28/src/console.c: In function 'Fcurrent_input_mode': /tmp/leif/xemacs-21.5.28/src/console.c:1178: warning: dereferencing type-punned pointer will break strict-aliasing rules /tmp/leif/xemacs-21.5.28/src/console.c:1180: warning: dereferencing type-punned pointer will break strict-aliasing rules /tmp/leif/xemacs-21.5.28/src/console.c:1181: warning: dereferencing type-punned pointer will break strict-aliasing rules ================================================================= There are quite a lot of these warnings. Please see the complete logs. My knowledge of English and C jargon is not enough to understand the expressions 'type-punned' and 'strict-aliasing', and Google gave just a big set of similar warnings. Can anyone give a quick explanation? Leif Andersson Lund University, Sweden _______________________________________________ XEmacs-Beta mailing list XEmacs-Beta(a)xemacs.org http://calypso.tux.org/cgi-bin/mailman/listinfo/xemacs-beta