Modify python-config.py or replace it with official one to support python3

  now I improve the patch to be compatible with python2.7 python 3.7 and
python3.8+


index gdb/configure.ac
   else

傅继晗 <fjhhz1997@gmail.com> 于2020年1月21日周二 下午7:41写道：
>
> ok.that is,and here is my patch.
> Tested with autoconf 2.69 and python3.8.
>
>
> index:gdb/configure.ac
> ============================
> --- a/gdb/configure.ac
> +++ b/gdb/configure.ac
> @@ -834,29 +834,31 @@
>      esac
>    esac
>
> +  python_config=
>    if test "${python_prog}" != missing; then
> +    AC_CHECK_FILE([${python_prog}-config],[python_config="${python_prog}-config
> --embed"],[python_config="${python_prog}
> ${srcdir}/python/python-config.py"])
>      # We have a python program to use, but it may be too old.
>      # Don't flag an error for --with-python=auto (the default).
>      have_python_config=yes
> -    python_includes=`${python_prog} ${srcdir}/python/python-config.py
> --includes`
> +    python_includes=`${python_config} --includes`
>      if test $? != 0; then
>        have_python_config=failed
>        if test "${with_python}" != auto; then
> -        AC_ERROR(failure running python-config --includes)
> +        AC_ERROR(failure running ${python_config} --includes)
>        fi
>      fi
> -    python_libs=`${python_prog} ${srcdir}/python/python-config.py --ldflags`
> +    python_libs=`${python_config} --ldflags`
>      if test $? != 0; then
>        have_python_config=failed
>        if test "${with_python}" != auto; then
> -        AC_ERROR(failure running python-config --ldflags)
> +        AC_ERROR(failure running ${python_config} --ldflags)
>        fi
>      fi
> -    python_prefix=`${python_prog} ${srcdir}/python/python-config.py
> --exec-prefix`
> +    python_prefix=`${python_config} --exec-prefix`
>      if test $? != 0; then
>        have_python_config=failed
>        if test "${with_python}" != auto; then
> -        AC_ERROR(failure running python-config --exec-prefix)
> +        AC_ERROR(failure running ${python_config} --exec-prefix)
>        fi
>      fi
>    else
>
> Christian Biesinger <cbiesinger@google.com> 于2020年1月21日周二 上午8:30写道：
> >
> > On Mon, Jan 20, 2020 at 8:05 AM 傅继晗 <fjhhz1997@gmail.com> wrote:
> > >
> > > The formal patch only works on OSX.And here is the patch to make the
> > > crossbuild available.
> >
> > configure is a generated file. Please edit configure.ac instead, and
> > run autoconf to regenerate configure. Make sure to use autoconf
> > version 2.69.
> >
> > Christian
> >
> > > diff --git a/gdb/configure-origin b/gdb/configure
> > > --- a/gdb/configure-origin
> > > +++ b/gdb/configure
> > > @@ -9858,21 +9858,21 @@ fi
> > > # We have a python program to use, but it may be too old.
> > > # Don't flag an error for --with-python=auto (the default).
> > > have_python_config=yes
> > > - python_includes=`${python_prog} ${srcdir}/python/python-config.py --includes`
> > > + python_includes=`${python_prog}-config --includes`
> > > if test $? != 0; then
> > > have_python_config=failed
> > > if test "${with_python}" != auto; then
> > > as_fn_error "failure running python-config --includes" "$LINENO" 5
> > > fi
> > > fi
> > > - python_libs=`${python_prog} ${srcdir}/python/python-config.py --ldflags`
> > > + python_libs=`${python_prog}-config --ldflags`
> > > if test $? != 0; then
> > > have_python_config=failed
> > > if test "${with_python}" != auto; then
> > > as_fn_error "failure running python-config --ldflags" "$LINENO" 5
> > > fi
> > > fi
> > > - python_prefix=`${python_prog} ${srcdir}/python/python-config.py --exec-prefix`
> > > + python_prefix=`${python_prog}-config --exec-prefix`
> > > if test $? != 0; then
> > > have_python_config=failed
> > > if test "${with_python}" != auto; then
> > >
> > >
> > > 傅继晗 <fjhhz1997@gmail.com> 于2020年1月20日周一 下午8:02写道：
> > > >
> > > > By default,gdb is compiled with python2 script support on OSX. However,when compiled with arg "--with-python=/path/to/python3 " to support python3 ,some error occurred that seems python3 is not recognized.
> > > > The reason is that the python-config.py is not the same as the official one.BTW,this issue was once referred at 20 Dec 2012 mail :https://sourceware.org/ml/gdb-patches/2012-12/msg00751.html.
> > > > Somehow,It is not committed(maybe the maintainer forgot it due to the happy chrismas holiday).
> > > > And here is my patch:
> > > >
> > > > index: b/gdb/python/python-config.py
> > > > ===============================
> > > > --- a/gdb/python/python-config.py
> > > > +++ b/gdb/python/python-config.py
> > > > @@ -72,7 +72,7 @@ for opt in opt_flags:
> > > >                      libs.insert(0, '-L' + getvar('LIBPL'))
> > > >                  elif os.name == 'nt':
> > > >                      libs.insert(0, '-L' + sysconfig.PREFIX + '/libs')
> > > > -            if getvar('LINKFORSHARED') is not None:
> > > > +            if not getvar('PYTHONFRAMEWORK'):
> > > >                  libs.extend(getvar('LINKFORSHARED').split())
> > > >          print (to_unix_path(' '.join(libs)))