Cygwin: To Convert Pango Static Libraries to Shared Libraries

Pango is a required component of GTK+ libraries. With Cygwin GCC compiler, I was compiling Pango during GTK+ compilation. But I ran into a problem when only static libraries of Pango were produced. So I had to produce shared libraries of Pango from static ones. Here I show how I did it using dllwrap:

1. First, create empty directories:
   
   

   mkdir pango pangocairo pangoft2 pangowin32

   
   
2. Extract object codes from the static libraries into separate directories:
   
   

   cd pango
   ar x /usr/lib/libpango-1.0.a
   cd ../pangocairo/
   ar x /usr/lib/libpangocairo-1.0.a
   cd ../pangoft2/
   ar x /usr/lib/libpangoft2-1.0.a
   cd ../pangowin32/
   ar x /usr/lib/libpangowin32-1.0.a

   
   
3. Create a shared library cygpango-1.0-0.dll and import library libpango-1.0.dll.a from the static library /usr/lib/libpango-1.0.a. The dependencies are gotten from /usr/lib/libpango-1.0.la:
   
   

   cd ../pango/
   
   dllwrap --verbose --export-all-symbols --add-stdcall-alias -o /usr/bin/cygpango-1.0-0.dll --dllname cygpango-1.0-0.dll --output-lib /usr/lib/libpango-1.0.dll.a *.o -L/usr/lib -lgobject-2.0 -lgmodule-2.0 -lglib-2.0 -luser32 -lkernel32 -lintl -liconv

   
   
4. Likewise, convert /usr/lib/libpangowin32-1.0.a to a shared library:
   
   

   cd ../pangowin32/
   
   dllwrap --verbose --export-all-symbols --add-stdcall-alias -o /usr/bin/cygpangowin32-1.0-0.dll --dllname cygpangowin32-1.0-0.dll --output-lib /usr/lib/libpangowin32-1.0.dll.a *.o -L/usr/lib -lpango-1.0 -lgobject-2.0 -lgmodule-2.0 -lglib-2.0 -luser32 -lkernel32 -lintl -liconv -lgdi32

   
   
5. Likewise, convert /usr/lib/libpangoft2-1.0.a to a shared library:
   
   

   cd ../pangoft2/
   
   dllwrap --verbose --export-all-symbols --add-stdcall-alias -o /usr/bin/cygpangoft2-1.0-0.dll --dllname cygpangoft2-1.0-0.dll --output-lib /usr/lib/libpangoft2-1.0.dll.a *.o -L/usr/lib -lpango-1.0 -lgobject-2.0 -lgmodule-2.0 -lglib-2.0 -luser32 -lkernel32 -lintl -lfontconfig -lxml2 -liconv -lfreetype -lz

   
   

   If fontconfig was compiled with expat, replace -lxml2 with -lexpat.

   
   
6. Likewise, convert /usr/lib/libpangocairo-1.0.a to a shared library:
   
   

   cd ../pangocairo/
   
   dllwrap --verbose --export-all-symbols --add-stdcall-alias -o /usr/bin/cygpangocairo-1.0-0.dll --dllname cygpangocairo-1.0-0.dll --output-lib /usr/lib/libpangocairo-1.0.dll.a *.o -L/usr/lib -lcairo -lmsimg32 -lpixman-1 -lpng12 -lpangowin32-1.0 -lgdi32 -lpangoft2-1.0 -lpango-1.0 -lgobject-2.0 -lgmodule-2.0 -lglib-2.0 -luser32 -lkernel32 -lintl -lfontconfig -lxml2 -liconv -lfreetype -lz

   
   

   If fontconfig was compiled with expat, replace -lxml2 with -lexpat.

   
   
   
7. Finally, modify /usr/lib/libpango*.la accordingly. For example, I made the following change to my libpango-1.0.la file:
   
   

   dlname='../bin/cygpango-1.0-0.dll'
   library_names='libpango-1.0.dll.a'

   
   

This creates shared libraries cygpango-1.0-0.dll, cygpangowin32-1.0-0.dll, cygpangoft2-1.0-0.dll, cygpangocairo-1.0-0.dll and import libraries libpango-1.0.dll.a, libpangowin32-1.0.dll.a, libpangoft2-1.0.dll.a, libpangocairo-1.0.dll.a.