bug#55022: error compiling emacs 28.1

bug#55022: error compiling emacs 28.1

[robin hankin]

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Ubuntu 20.04. I downloaded emacs-28.1.tar.gz and untarred it and changed
to the correct directory.  Then:

./configure
./make

configure finished without error.  But make failed:

[snip]
e[2]: Leaving directory '/home/rhankin/Downloads/emacs-28.1/admin/unidata'
make -C ../admin/unidata emoji-zwj.el
make[2]: Entering directory
'/home/rhankin/Downloads/emacs-28.1/admin/unidata'
make[2]: Nothing to be done for 'emoji-zwj.el'.
make[2]: Leaving directory
'/home/rhankin/Downloads/emacs-28.1/admin/unidata'
  CCLD     temacs
/usr/bin/ld: /lib/x86_64-linux-gnu/libpangoft2-1.0.so.0: undefined
reference to `hb_ot_layout_script_select_language'
/usr/bin/ld: /lib/x86_64-linux-gnu/libpangoft2-1.0.so.0: undefined
reference to `hb_blob_create_from_file'
/usr/bin/ld: /lib/x86_64-linux-gnu/libpangoft2-1.0.so.0: undefined
reference to `hb_ot_var_named_instance_get_design_coords'
/usr/bin/ld: /lib/x86_64-linux-gnu/libpangoft2-1.0.so.0: undefined
reference to `hb_ot_tags_from_script_and_language'
/usr/bin/ld: /lib/x86_64-linux-gnu/libpangoft2-1.0.so.0: undefined
reference to `hb_ot_var_get_axis_infos'
/usr/bin/ld: /lib/x86_64-linux-gnu/libpango-1.0.so.0: undefined reference
to `hb_buffer_set_invisible_glyph'
/usr/bin/ld: /lib/x86_64-linux-gnu/libpangoft2-1.0.so.0: undefined
reference to `hb_ot_metrics_get_position'
collect2: error: ld returned 1 exit status
make[1]: *** [Makefile:647: temacs] Error 1
make[1]: Leaving directory '/home/rhankin/Downloads/emacs-28.1/src'
make: *** [Makefile:449: src] Error 2
rhankin@limpet:~/Downloads/emacs-28.1$

I would expect a successful ./configure to result in compilation, not an
error.



<hankin.robin@gmail.com>

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bug#55022: error compiling emacs 28.1

[Eli Zaretskii]

> From: robin hankin <hankin.robin@gmail.com>
> Date: Tue, 19 Apr 2022 19:03:07 +1200
> 
> Ubuntu 20.04. I downloaded emacs-28.1.tar.gz and untarred it and changed
> to the correct directory.  Then:
> 
> ./configure
> ./make
> 
> configure finished without error.  But make failed:
> 
> [snip]
> e[2]: Leaving directory '/home/rhankin/Downloads/emacs-28.1/admin/unidata'
> make -C ../admin/unidata emoji-zwj.el
> make[2]: Entering directory '/home/rhankin/Downloads/emacs-28.1/admin/unidata'
> make[2]: Nothing to be done for 'emoji-zwj.el'.
> make[2]: Leaving directory '/home/rhankin/Downloads/emacs-28.1/admin/unidata'
>   CCLD     temacs
> /usr/bin/ld: /lib/x86_64-linux-gnu/libpangoft2-1.0.so.0: undefined reference to
> `hb_ot_layout_script_select_language'
> /usr/bin/ld: /lib/x86_64-linux-gnu/libpangoft2-1.0.so.0: undefined reference to `hb_blob_create_from_file'
> /usr/bin/ld: /lib/x86_64-linux-gnu/libpangoft2-1.0.so.0: undefined reference to
> `hb_ot_var_named_instance_get_design_coords'
> /usr/bin/ld: /lib/x86_64-linux-gnu/libpangoft2-1.0.so.0: undefined reference to
> `hb_ot_tags_from_script_and_language'
> /usr/bin/ld: /lib/x86_64-linux-gnu/libpangoft2-1.0.so.0: undefined reference to `hb_ot_var_get_axis_infos'
> /usr/bin/ld: /lib/x86_64-linux-gnu/libpango-1.0.so.0: undefined reference to `hb_buffer_set_invisible_glyph'
> /usr/bin/ld: /lib/x86_64-linux-gnu/libpangoft2-1.0.so.0: undefined reference to `hb_ot_metrics_get_position'
> collect2: error: ld returned 1 exit status
> make[1]: *** [Makefile:647: temacs] Error 1
> make[1]: Leaving directory '/home/rhankin/Downloads/emacs-28.1/src'
> make: *** [Makefile:449: src] Error 2
> rhankin@limpet:~/Downloads/emacs-28.1$ 

Emacs 28.1 doesn't call any of these functions.  Since the error
messages are triggered by libpangoft2-1.0.so, my guess would be that
your system has a misconfigured installation of Pango and HarfBuzz:
the former requires a (probably later?) version of HarfBuzz than the
HarfBuzz version actually installed.

So I think you should review the relevant libraries installed on your
system, and perhaps upgrade some of them.  Then try reconfiguring and
rebuilding Emacs.

bug#55022: error compiling emacs 28.1

[Eli Zaretskii]

> From: robin hankin <hankin.robin@gmail.com>
> Date: Wed, 20 Apr 2022 07:29:53 +1200
> 
> OK, thanks for this.  But surely it is reasonable to expect ./configure  to detect such problems?

Not really: configure script usually tests for a library by calling
the pkg-config command, and even if it tries to build a test program
with the library, that test program definitely cannot call all of the
functions that Emacs does, and thus cannot find such problems with
100% probability.

> But, my
> main concern is to allow others who will encounter exactly the same problem [I use an unmodified ubuntu
> 20.04]  to see that they are not alone.

I'd suggest to report this to the Ubuntu package maintainers: it
sounds like their packaging has some problem.

bug#55022: error compiling emacs 28.1

[Lars Ingebrigtsen]

robin hankin <hankin.robin@gmail.com> writes:

> /usr/bin/ld: /lib/x86_64-linux-gnu/libpangoft2-1.0.so.0: undefined reference to
> `hb_ot_layout_script_select_language'

Like Eli says, this sounds like it could be a bug in Ubuntu 20.04, but
perhaps we could work around it anyway.  I don't have system with that
OS available here -- do you know what library defines
hb_ot_layout_script_select_language?  And if so, does altering the
configure script to include that library (with -lthat-library) fix the
build issue?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

bug#55022: error compiling emacs 28.1

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Date: Wed, 20 Apr 2022 12:59:31 +0200
> Cc: 55022@debbugs.gnu.org
> 
> do you know what library defines
> hb_ot_layout_script_select_language?

All the hb_* functions are from HarfBuzz.

bug#55022: error compiling emacs 28.1

[Lars Ingebrigtsen]

robin hankin <hankin.robin@gmail.com> writes:

> /usr/bin/ld: /lib/x86_64-linux-gnu/libpango-1.0.so.0: undefined reference to
> `hb_buffer_set_invisible_glyph'
> /usr/bin/ld: /lib/x86_64-linux-gnu/libpangoft2-1.0.so.0: undefined reference to
> `hb_ot_metrics_get_position'

I found an Ubuntu 20.04 system here, and Emacs built fine by default.

I tried removing libharfbuzz-dev manually, and I then got this warning:

configure: WARNING: This configuration uses the Cairo graphics library,
    but not the HarfBuzz font shaping library (minimum version 0.9.42).
    We recommend the use of HarfBuzz when using Cairo, please install
    appropriate HarfBuzz development packages.

But Emacs still built fine.

So I think it sounds likely that your system is somewhat broken in one
way or another, and there's not much that can be done on the Emacs side
here, so I'm closing this bug report.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no