no links in PDFs with gs 9.56.1 (update)

[Werner LEMBERG]

In the end of July I wrote:

> Two days ago I've updated my openSUSE box, which now comes with gs
> 9.56.1 – previously, I had gs 9.54.0.  This new gs version uses a
> brand-new PDF engine written in C, replacing the old one written in
> PostScript.
> 
> Building the LilyPond documentation I wondered why the new output
> file size of `notation.pdf` is only 75% of the old size.  After some
> checks I found out that all links are gone.
> 
> So, a heads-up: gs 9.56.0 and 9.56.1 are buggy!  According to
> 
>   https://bugs.ghostscript.com/show_bug.cgi?id=705565
> 
> this has been fixed meanwhile, but I have no idea when 9.56.2 gets
> released.

Very bad news: with gs 10.00.0 (released today) the abovementioned
problem is *not* fixed – there are still no links in the PDF.
Additionally, a build with `extractpdfmark` increases the size of
`notation.pdf` from 6.4MByte to 25.9MByte!  According to `pdffonts`,
the number of embedded fonts increases from 78 to 4400.

> In case you are forced to use 9.56.1, add `-dNEWPDF=false` to the gs
> command line options (in file `Documentation/GNUmakefile`) to make
> gs use the old PDF engine, which produces good results.

This is still true; for testing, I've attached the corresponding
patch.

Right now I don't have the stamina to further analyze this issue.
Please verify my observations!  If I'm right it would be urgently
necessary to prepare bug reports for the ghostscript people – they
want to remove the old PDF engine in a few months...


    Werner

diff --git a/Documentation/GNUmakefile b/Documentation/GNUmakefile
index 7000a2a00d..f3ee66144a 100644
--- a/Documentation/GNUmakefile
+++ b/Documentation/GNUmakefile
@@ -266,6 +266,7 @@ ifeq ($(USE_EXTRACTPDFMARK),yes)
            -sDEVICE=pdfwrite \
            -dAutoRotatePages=/None \
            -dPrinted=false \
+           -dNEWPDF=false \
            -dColorConversionStrategy=/LeaveColorUnchanged \
            -dDownsampleMonoImages=false \
            -dDownsampleGrayImages=false \
@@ -836,6 +837,7 @@ $(outdir)/%.png: %.eps
        mkdir -p $(dir $@)
        gs -dAutoRotatePages=/None \
            -dPrinted=false \
+          -dNEWPDF=false \
            -dTextAlphaBits=4 \
            -dGraphicsAlphaBits=4 \
            -q \
@@ -851,6 +853,7 @@ $(outdir)/%.pdf: %.eps
        mkdir -p $(dir $@)
        gs -dAutoRotatePages=/None \
            -dPrinted=false \
+          -dNEWPDF=false \
            -q \
            -sDEVICE=pdfwrite \
            -dNOPAUSE \