Re: Help needed with gobject-introspection

[Ken Brown <kbrown@cornell.edu>]

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.

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.  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.

Ken