compiling emacs-23.4 with CANNOT_DUMP

compiling emacs-23.4 with CANNOT_DUMP

[rrandresf]

Hi.

I am trying to compile emacs 23.4 but I was hit with the glibc-unexec
issue. So emacs23 can not Dump. Then I remember Paul Eggert tried
CANNOT_DUMP in the past. Then I tried CANNOT_DUMP on emacs23 with the
result below.

I am getting this error:
--8<---------------cut here---------------start------------->8---
Symbol's function definition is void: dump-emacs
--8<---------------cut here---------------end--------------->8---

Any ideas how to continue the compilation?

AR

Re: compiling emacs-23.4 with CANNOT_DUMP

[Paul Eggert]

On 12/27/19 1:13 AM, rrandresf@gmail.com wrote:
> Any ideas how to continue the compilation?

I suggest building emacs-27 with './configure --with-dumping=none'. You can get
it by cloning the emacs-27 branch from Savannah
<https://savannah.gnu.org/projects/emacs> and running './autogen.sh' before
running 'configure'.

I'm suggesting this partly because I don't want to think about Emacs 23 any
more, particularly with respect to obscure features like CANNOT_DUMP.

Re: compiling emacs-23.4 with CANNOT_DUMP

[andrés ramírez]

Hi Paul.

Just for the record (perhaps in the future myself should check this info
again). 
--8<---------------cut here---------------start------------->8---
In GNU Emacs 23.4 (armv7l-unknown-linux-gnueabi)
 of 2019-12-30 on sacsa
configured using `configure  '--without-gif' '--with-jpeg=no' '--without-dbus' '--without-gconf' '--without-libotf' '--without-m17n-flt' '--without-gpm' '--program-suffix=emacs23' '--infodir=/share/info/emacs23' '--localstatedir=/var' '--without-x' '--with-x-toolkit=no' 'CFLAGS=-g3 -O0' 'LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now' 'CPPFLAGS=-D_FORTIFY_SOURCE=2''
--8<---------------cut here---------------end--------------->8---

compilation was completed (5 files were modified):

src/s/gnu-linux.h:163
#define GNU_LIBRARY_PENDING_OUTPUT_COUNT(FILE) \
  ((FILE)->_IO_write_ptr - (FILE)->_IO_write_base)

src/config.h:924
#define CANNOT_DUMP 1

src/lread.c:4070
  if (!NILP (Vinstallation_directory))
    normal = PATH_DUMPLOADSEARCH;

src/Makefile.in {930; 1410}
just leaving the CANNOT_DUMP parts of the #ifdef

./Makefile.in:526 {just on armv7h, not needed on i686}
	   fullversion=`./src/emacs --batch --eval '(princ (emacs-version))' | sed -n '1 s/GNU Emacs *//p'`; \

After compilation was completed the HOME var was not setted-up on the emacs
undumped-binary. added a file site-init.el with (setenv "HOME" "/home/my")

And that's it.

I tried also compiling it removing -O0 from CFLAGS. But it failed 
within a command "shadow paths" or something like that. So I need to
removed optimizations from the configure script.

BTW. I have also compiled with CANNOT_DUMP emacs-25 and emacs-26.
emacs-26 is ok
emacs-25 have some issues (i do not remember exactly which ones)

BR