lilypond, guile 2 and OpenSuSE

[Knut Petersen]

Hi everybody!

Status of guile on OpenSuSE distributions:
==========================================

OpenSuSE Tumbleweed includes guile 2.0.13 since 2016-10-15.
OpenSuSE Leap does include guile 2, but the version is too old to support 
lilypond.
Manual installation of the guile 2 version from Tumbleweed is possible on Leap.
All current versions of the OpenSuSE distribution allow simultaneous 
installation of guile 1 and 2.

Building current lilypond master using guile 1 on Tumbleweed succeeds:
======================================================================

   Building lilypond 92d84685be9b496d4c983e555e846341ecc4e5f0... this will take 
some time ;-)
   configure flags to be used: --prefix=/home/knut/sources/lilyg1built/
   exec ./autogen.sh --noconfigure in /home/knut/sources/lily ... succeeded 
after 0 seconds
   exec ../configure --prefix=/home/knut/sources/lilyg1built/ in 
/home/knut/sources/lily/build ... succeeded after 5 seconds
   exec make -k -j 11 CPU_COUNT=11 all in /home/knut/sources/lily/build ... 
succeeded after 92 seconds
   exec make -j 11 CPU_COUNT=11 install in /home/knut/sources/lily/build ... 
succeeded after 2 seconds
   exec make -j 11 CPU_COUNT=11 doc in /home/knut/sources/lily/build ... 
succeeded after 831 seconds
   exec make -j 11 CPU_COUNT=11 install-doc in /home/knut/sources/lily/build 
... succeeded after 4 seconds
   Total lilypond build time: 934 seconds

Building current lilypond master + the 15 patches from 
ao2.it/tmp/lilypond-guile2/patches_2016-11-22
using guile 2 on Tumbleweed succeeds too:
======================================================================================================

   Building lilypond d0c4acca9fc6a9d9f2d2073ab01499809b7e4981... this will take 
some time ;-)
   configure flags to be used: --prefix=/home/knut/sources/lilyg2built/ 
--enable-guile2
   exec ./autogen.sh --noconfigure in /home/knut/sources/lilyg2 ... succeeded 
after 1 seconds
   exec ../configure --prefix=/home/knut/sources/lilyg2built/ --enable-guile2 
in /home/knut/sources/lilyg2/build ... succeeded after 5 seconds
   exec make -k -j 11 CPU_COUNT=11 all in /home/knut/sources/lilyg2/build ... 
succeeded after 98 seconds
   exec make -j 11 CPU_COUNT=11 install in /home/knut/sources/lilyg2/build ... 
succeeded after 1 seconds
   exec make -j 11 CPU_COUNT=11 doc in /home/knut/sources/lilyg2/build ... 
succeeded after 1313 seconds
   exec make -j 11 CPU_COUNT=11 install-doc in /home/knut/sources/lilyg2/build 
... succeeded after 5 seconds
   Total lilypond build time: 1423 seconds

Tests
=====

Compiling some of my own scores with both the guile 1 and guile 2 versions 
succeeds. The pdfs are visually identical,
although they are not byte-identical. Compiling to postscript and comparing the 
results shows the reason:

   address@hidden:~/Invention> diff Distler_LobeDenHerren_Schwabacher_g1.ps 
Distler_LobeDenHerren_Schwabacher_g2.ps
   15c15
   < /lilypond-datadir where {pop} {userdict /lilypond-datadir 
(/home/knut/sources/lilyg1built/share/lilypond/2.19.52) put } ifelse
   ---
    > /lilypond-datadir where {pop} {userdict /lilypond-datadir 
(/home/knut/sources/lilyg2built/share/lilypond/2.19.52) put } ifelse
   5639,5641c5639,5641
   < /lily-output-units 2.83464566929134 def %% millimeter
   < /staff-line-thickness 0.119078341013825 def
   < /line-width 124.824993649987 def
   ---
    > /lily-output-units 2.834645669291339 def %% millimeter
    > /staff-line-thickness 0.11907834101382486 def
    > /line-width 124.82499364998729 def
   5644,5646c5644,5646
   < /output-scale 1.36190673861907 def
   < /page-height 218.076606553213 def
   < /page-width 154.195580391161 def
   ---
    > /output-scale 1.3619067386190675 def
    > /page-height 218.07660655321308 def
    > /page-width 154.19558039116077 def


So there is no real problem, only an irrelevant difference in precision.

Speed
=====

Compiling a moderately complex score with both versions showed
that the guile-2-version is much slower (real exec times):

   guile-2-version: 0m20,032s 0m19,186 0m19,124s
   guile-1-version: 0m8,814s 0m9,023s 0m8,971s

cu,
 Knut