Staging is broken

[pkx166h]

Hello,

..

Making lily/out/metronome-engraver.o < cc
Making lily/out/warn-scheme.o < cc
Making lily/out/lexer.o < cc
Making lily/out/parser.o < cc
./out/parser.cc: In function 'int yyparse(Lily_parser*, 
scm_unused_struct**)':
./out/parser.cc:2917:12: warning: conversion to 'yytype_int16 {aka short 
int}' from 'int' may alter its value [-Wconversion]
   *yyssp = yystate;
            ^~~~~~~
out/lexer.cc: In member function 'virtual int 
yyFlexLexer::LexerInput(char*, int)':
out/lexer.cc:6468:21: warning: conversion to 'int' from 'std::streamsize 
{aka long int}' may alter its value [-Wconversion]
   return yyin.gcount();
          ~~~~~~~~~~~^~
Making lily/out/lilypond
/usr/bin/ld: final link failed: No space left on device
collect2: error: ld returned 1 exit status
/tmp/lilypond-autobuild/stepmake/stepmake/executable-rules.make:12: 
recipe for target 'out/lilypond' failed
make[1]: *** [out/lilypond] Error 1
/tmp/lilypond-autobuild/stepmake/stepmake/generic-targets.make:6: recipe 
for target 'all' failed
make: *** [all] Error 2

--

I pushed a doc change but it doesn't look like that so either it's 
Han-Wen's or Jean-Charle's cherry picks.

James