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bug#13818: 24.3.50; Bootstrap failed on Cygwin due to revno: 111870

From: Ken Brown
Subject: bug#13818: 24.3.50; Bootstrap failed on Cygwin due to revno: 111870
Date: Tue, 26 Feb 2013 18:13:31 -0500
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130107 Thunderbird/17.0.2

On 2/26/2013 12:35 PM, Paul Eggert wrote:
On 02/26/13 04:42, Ken Brown wrote:
On 2/26/2013 2:23 AM, Katsumi Yamaoka wrote:
In GNU Emacs (i686-pc-cygwin, X toolkit, Xaw3d scroll bars)
   of 2013-02-26 on localhost
Bzr revision: 111880 address@hidden
Windowing system distributor `The Cygwin/X Project', version 11.0.11302000
Configured using:
   `configure --verbose --with-x-toolkit=lucid --without-imagemagick
   --without-dbus --without-gconf --without-gsettings'

When dumping temacs it stops by the following error:

vm-limit.o: In function `memory_warnings':
src/vm-limit.c:239: undefined reference to `_data_start'

I see that Katsumi just answered, but here are the answers on my system.

Can you please give the full shell command that
generated that line?  I assume it's something like
"gcc ... -o temacs ..." but would like the details.

gcc -std=gnu99 -Demacs -I. -I/home/kbrown/src/emacs/test/src -I../lib -I/home/kbrown/src/emacs/test/src/../lib -D_REENTRANT -I/usr/include/gtk-3.0 -I/usr/include/atk-1.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/pango-1.0 -I/usr/include/gio-unix-2.0/ -I/usr/include/cairo -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/harfbuzz -I/usr/include/freetype2 -I/usr/include/pixman-1 -I/usr/include/libpng15 -DGDK_DISABLE_DEPRECATION_WARNINGS -I/usr/include/freetype2 -D_REENTRANT -I/usr/include/librsvg-2.0 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/cairo -I/usr/include/libpng15 -I/usr/include/pixman-1 -I/usr/include/freetype2 -fopenmp -I/usr/include/ImageMagick -I/usr/include/libxml2 -I/usr/include/dbus-1.0 -I/usr/lib/dbus-1.0/include -D_REENTRANT -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -D_REENTRANT -I/usr/include/gconf/2 -I/usr/include/dbus-1.0 -I/usr/lib/dbus-1.0/include -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/freetype2 -MMD -MF deps/.d -MP -I/usr/include/p11-kit-1 -g3 -O2 \ -o temacs vm-limit.o dispnew.o frame.o scroll.o xdisp.o menu.o xmenu.o window.o charset.o coding.o category.o ccl.o character.o chartab.o bidi.o cm.o term.o terminal.o xfaces.o xterm.o xfns.o xselect.o xrdb.o xsmfns.o xsettings.o xgselect.o gtkutil.o emacsgtkfixed.o dbusbind.o emacs.o keyboard.o macros.o keymap.o sysdep.o buffer.o filelock.o insdel.o marker.o minibuf.o fileio.o dired.o cmds.o casetab.o casefiddle.o indent.o search.o regex.o undo.o alloc.o data.o doc.o editfns.o callint.o eval.o floatfns.o fns.o font.o print.o lread.o syntax.o unexcw.o bytecode.o process.o gnutls.o callproc.o region-cache.o sound.o atimer.o doprnt.o intervals.o textprop.o composite.o xml.o inotify.o profiler.o sheap.o cygw32.o xfont.o ftfont.o xftfont.o ftxfont.o fontset.o fringe.o image.o terminfo.o gmalloc.o lastfile.o ../lib/libgnu.a -ltiff -ljpeg -lpng -lz -lm -lgif -lXpm -lgtk-3 -latk-bridge-2.0 -lgdk-3 -latk-1.0 -lXinerama -lXi -lXrandr -lXcursor -lXcomposite -lXdamage -lpangocairo-1.0 -lgdk_pixbuf-2.0 -lcairo-gobject -lgio-2.0 -lXfixes -lpangoft2-1.0 -lharfbuzz -lpango-1.0 -lcairo -lpixman-1 -lfontconfig -lexpat -lfreetype -lbz2 -lxcb-shm -lxcb-render -lXrender -lXext -lX11 -lxcb -lXau -lXdmcp -lpng15 -lm -lz -lgmodule-2.0 -lgobject-2.0 -lffi -lglib-2.0 -lintl -liconv -lpcre -lSM -lICE -lX11 -lXrender -lXft -lXrender -lfontconfig -lexpat -lfreetype -lz -lbz2 -lX11 -lxcb -lXau -lXdmcp -lrsvg-2 -lgio-2.0 -lgdk_pixbuf-2.0 -lcairo -lgmodule-2.0 -lgobject-2.0 -lffi -lpixman-1 -lfontconfig -lexpat -lfreetype -lbz2 -lpng15 -lm -lz -lxcb-shm -lxcb-render -lXrender -lXext -lglib-2.0 -lintl -liconv -lpcre -lX11 -lxcb -lXau -lXdmcp -lMagickWand -lMagickCore -ldbus-1 -lpthread -lrt -lxml2 -lz -liconv -lm -lncurses -lgio-2.0 -lz -lgmodule-2.0 -lgobject-2.0 -lffi -lglib-2.0 -lintl -liconv -lpcre -lgconf-2 -ldbus-1 -lpthread -lrt -lgio-2.0 -lz -lgmodule-2.0 -lgobject-2.0 -lffi -lglib-2.0 -lintl -liconv -lpcre -lgobject-2.0 -lffi -lglib-2.0 -lintl -liconv -lpcre -lfreetype -lz -lbz2 -lfontconfig -lexpat -lfreetype -lz -lbz2 -L/usr/bin -lgnutls -lnettle -lhogweed -lgmp -ltasn1 -lp11-kit -lz -lpthread

data_start used to be defined in pre-crt0.c on Cygwin,
but this file was removed.

data_start is now supposed to be defined in vm-limit.c,
on hosts where the linker does not define it for you.

The problem seems to be that HAVE_DATA_START is defined to 1, but DATA_START is not defined. See below.

Is there some significance to the leading underscore
in that diagnostic?  (Is "_" automatically prepended
to external symbols on Cygwin?)

I think it's automatically prepended.

What does config.log say, after it says
"checking for data_start"?

configure:10083: checking for data_start
configure:10099: gcc -std=gnu99 -o conftest.exe -g3 -O2     conftest.c  >&5
configure:10099: $? = 0
configure:10107: result: yes

What is the value of HAVE_DATA_START in src/config.h?


Also, please examine the output of "gcc -E ... vm-limit.c",
where "..." contains the same flags as used for compiling
vm-limit.c, to see how data_start was declared and defined
in the preprocessor output.

It's declared as

  extern char data_start[];

but never defined. Apparently DATA_START is not defined. How is that supposed to happen?


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