Re: Help needed with gobject-introspection

[Jon Turney <jon.turney@dronecode.org.uk>]

On 21/05/2020 16:13, Ken Brown via Cygwin-apps wrote:
> 
> 
> On 5/21/2020 9:24 AM, Jon Turney wrote:
>> On 20/05/2020 15:50, Ken Brown via Cygwin-apps wrote:
>>> On 5/19/2020 7:04 PM, Ken Brown via Cygwin-apps wrote:
>>>> I would like to adopt gimp and related packages.  At the moment I'm 
>>>> having trouble with babl, which is needed for gegl0.4, which is 
>>>> needed for gimp. The problem involves gobject-introspection.
>>>>
>>>> If I disable introspection, the build works fine.  This would be OK, 
>>>> since babl has been built without introspection for several years. 
>>>> But then the gegl0.4 build complains about the missing babl 
>>>> introspection files, so I would have to disable introspection there 
>>>> too, which hasn't been done in the past.
>>>>
>>>> So my preference is to figure out what the problem is and get the 
>>>> babl build working with introspection.  I'm attaching my cygport 
>>>> file and patch.
>>>>
>>>> Here's the failing command...
>>>>
>>>> /usr/bin/g-ir-scanner -I/usr/include/gobject-introspection-1.0 
>>>> -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -D_REENTRANT 
>>>> --no-libtool --namespace=Babl --nsversion=0.1 --warn-all --output 
>>>> babl/Babl-0.1.gir --c-include=babl.h 
>>>> '--identifier-filter-cmd=/usr/bin/python3 
>>>> /tmp/cygbabl/babl-0.1.74-1.x86_64/src/babl-0.1.74/babl/identfilter.py' 
>>>> -DBABL_IS_BEING_COMPILED 
>>>> -I/tmp/cygbabl/babl-0.1.74-1.x86_64/src/babl-0.1.74/babl 
>>>> -I/tmp/cygbabl/babl-0.1.74-1.x86_64/src/babl-0.1.74/x86_64-pc-cygwin/babl 
>>>> -I./. -I../. -I./babl/base/. -I../babl/base/. 
>>>> --filelist=/tmp/cygbabl/babl-0.1.74-1.x86_64/src/babl-0.1.74/x86_64-pc-cygwin/babl/4170c83@@babl-0.1@sha/Babl_0.1_gir_filelist 
>>>> --cflags-begin -fno-unsafe-math-optimizations 
>>>> -Wdeclaration-after-statement -Winit-self -Wmissing-declarations 
>>>> -Wmissing-prototypes -Wold-style-definition -Wpointer-arith -mmmx 
>>>> -msse -mfpmath=sse -I./. -I../. -I./babl/base/. -I../babl/base/. 
>>>> --cflags-end --library babl-0.1 
>>>> -L/tmp/cygbabl/babl-0.1.74-1.x86_64/src/babl-0.1.74/x86_64-pc-cygwin/babl 
>>>> --extra-library=m --extra-library=dl --extra-library=lcms2
>>>>
>>>> ...and the error message:
>>>>
>>>> g-ir-scanner: link: gcc -o 
>>>> /tmp/cygbabl/babl-0.1.74-1.x86_64/src/babl-0.1.74/x86_64-pc-cygwin/tmp-introspectCwCaUc/Babl-0.1.exe 
>>>> -ggdb -O2 -pipe -Wall -Werror=format-security 
>>>> -Wp,-D_FORTIFY_SOURCE=2 -fstack-protector-strong 
>>>> --param=ssp-buffer-size=4 
>>>> -fdebug-prefix-map=/tmp/cygbabl/babl-0.1.74-1.x86_64/build=/usr/src/debug/babl-0.1.74-1 
>>>> -fdebug-prefix-map=/tmp/cygbabl/babl-0.1.74-1.x86_64/src/babl-0.1.74=/usr/src/debug/babl-0.1.74-1 
>>>> /tmp/cygbabl/babl-0.1.74-1.x86_64/src/babl-0.1.74/x86_64-pc-cygwin/tmp-introspectCwCaUc/Babl-0.1.o 
>>>> -L. -lbabl-0.1 -lm -ldl -llcms2 
>>>> -L/tmp/cygbabl/babl-0.1.74-1.x86_64/src/babl-0.1.74/x86_64-pc-cygwin/babl 
>>>> -Wl,-rpath,/tmp/cygbabl/babl-0.1.74-1.x86_64/src/babl-0.1.74/x86_64-pc-cygwin/babl 
>>>> -lgio-2.0 -lgobject-2.0 -Wl,--export-all-symbols -lgmodule-2.0 
>>>> -lglib-2.0 -lintl
>>>> ERROR: can't resolve libraries to shared libraries: babl-0.1
>>>>
>>>> I don't understand the error message, because the command line contains
>>>>
>>>> -L/tmp/cygbabl/babl-0.1.74-1.x86_64/src/babl-0.1.74/x86_64-pc-cygwin/babl 
>>>>
>>>>
>>>> and that directory contains libbabl-0.1.dll.a and cygbabl-0.1-0.dll. 
>>>> I even tried adding that directory to my PATH to make sure the right 
>>>> cygbabl-0.1-0.dll would be found, but that didn't help.
>>
>> This might possibly be related to the problem described in the comment 
>> for:
>>
>> https://github.com/mesonbuild/meson/pull/2880/commits/8a27c08b05e4537d5061d30ddd8aad9dc52cf1c4 
>>
>>
>>> By the way, in case you're wondering why I disabled the building of 
>>> docs, it's because I was getting a build failure there too.  I don't 
>>> know if this is related to the introspection failure.  The failing 
>>> command there is
>>>
>>> /usr/bin/meson --internal exe --unpickle 
>>> /tmp/cygbabl/babl-0.1.74-2.x86_64/src/babl-0.1.74/x86_64-pc-cygwin/meson-private/meson_exe_env_7bf39b99114d34540b83d26a5d8f097e05882836.dat 
>>>
>>> cp: target 'docs/index.html.tmp' is not a directory
>>>
>>> I don't know why it's not showing me the actual cp command that fails. 
>>
>> I believe it's is an infelicity in meson that it doesn't echo the 
>> actual failing command here.
>>
>> Noted here: 
>> https://github.com/mesonbuild/meson/pull/3716#issuecomment-395746838
>>
>>> The corresponding information in docs/meson.build is
>>>
>>> Reference_html = custom_target('Reference.html',
>>>    input : [
>>>      'Reference-static.html',
>>>      'toc',
>>>      index_html_tmp,
>>>    ],
>>>    output: [ 'Reference.html', ],
>>>    command: [
>>>      env_bin,
>>>      'cp', '@INPUT0@', '@OUTPUT@',
>>>      '&&', xml_insert, '@OUTPUT@', 'TOC', '@INPUT1@',
>>>      '&&', xml_insert, '@OUTPUT@', 'BablBase', '@INPUT2@',
>>>    ],
>>>    build_by_default: true,
>>> )
>>>
>>> There are several such custom targets in the file, and for all except 
>>> this one, I see the actual cp command in the log.  This is the only 
>>> one for which meson generates a 'meson --unpickle' command instead of 
>>> a cp command.
>>
>> Yeah, I wasn't expecting it to use this method of executing the 
>> command line (storing it in a pickle and then using a python wrapper 
>> to execute it) to be used except on Windows, so I'll have to take a 
>> more detailed look at why that's happening.
> 
> Thanks.  FWIW, the recipe for building docs/Reference.html translates to
> 
>    /usr/bin/env \
>       cp ../docs/Reference-static.html docs/Reference.html \
>        && ../docs/tools/xml_insert.sh docs/Reference.html TOC ../docs/toc \
>        && ../docs/tools/xml_insert.sh \
>           docs/Reference.html BablBase docs/index.html.tmp
> 
> This succeeds when run manually in the build directory.  So something 
> must have gone wrong in the pickling/unpickling process.


patching 
/usr/lib/python3.6/site-packages/mesonbuild/scripts/meson_exe.py 
something like this might shed some light:

--- meson_exe.py.bak    2020-05-21 15:01:19.187046500 +0100
+++ meson_exe.py        2020-05-21 15:09:29.485915300 +0100
@@ -57,6 +57,8 @@
                  ['Z:' + p for p in exe.extra_paths] + 
child_env.get('WINEPATH', '').split(';')
              )

+    print(cmd_args)
+
      p = subprocess.Popen(cmd_args, env=child_env, cwd=exe.workdir,
                           close_fds=False,
                           stdout=subprocess.PIPE,