[metapost] Metapost btex etex problem

["Rothfuß, Ralf"]

Hello,

I have a problem with the use of btex ... etex in MetaPost figures. Searching already for quite a while I found a lot of similar issues but unfortunately without a  solution.

The installation I am using is a recent installed TeX Live 2013 on Windows 8 (64bit) .  I used the install-tl-advanced.bat for installation (including "full scheme").

I want to  compile the following (reduced) example mpsimple.mp:

verbatimtex
%&pdflatex
\documentclass[12pt]{article}
\usepackage[latin1]{inputenc}
\usepackage[T1]{fontenc}
\begin{document}
etex
beginfig(1)
  draw (0,0)--(5cm,0) withpen pencircle scaled 1pt;
  label.rt(btex $A$ etex, (5cm, 0cm));
endfig;
end;
%% End

Trying to compile with "mpost  - -debug mpsimple.mp" I obtain the following message (compiling without - -debug or "mpost -tex=pdflatex mpsimple.mp" 
yields the same problem):

C:\tmp>mpost --debug mpsimple.mp
This is MetaPost, version 1.803 (kpathsea version 6.1.1)
(mpost.mp (c:/rt/texlive/2013/texmf-dist/metapost/base/plain.mp
Preloading the plain mem file, version 1.004) ) (./mpsimple.mpmakempx debug: ./mpsimple.mp: running command etex --parse
-first-line --interaction=nonstopmode mpa04972.tex
makempx debug: ./mpsimple.mp: renaming mpa04972.tex to mpxerr.tex
makempx debug: ./mpsimple.mp: renaming mpa04972.log to mpxerr.log
fatal: Command failed: etex --parse-first-line --interaction=nonstopmode mpa04972.tex; see mpxerr.logmakempx fatal: ./mp
simple.mp: Command failed: etex --parse-first-line --interaction=nonstopmode mpa04972.tex; see mpxerr.log

>> mpsimple.mp
>> mpsimple.mpx
! ! Unable to make mpx file.
l.10   label.rt(btex
                     $A$ etex, (5cm, 1cm));
Transcript written on mpsimple.log.

There is no mpxerr.log file. The file mpa04972.tex contains:

%&pdflatex
\documentclass[12pt]{article}
\usepackage[latin1]{inputenc}
\usepackage[T1]{fontenc}
\begin{document}

\gdef\mpxshipout{\shipout\hbox\bgroup
  \setbox0=\hbox\bgroup}
\gdef\stopmpxshipout{\egroup  \dimen0=\ht0 \advance\dimen0\dp0
  \dimen1=\ht0 \dimen2=\dp0
  \setbox0=\hbox\bgroup
    \box0
    \ifnum\dimen0>0 \vrule width1sp height\dimen1 depth\dimen2 
    \else \vrule width1sp height1sp depth0sp\relax
    \fi\egroup
  \ht0=0pt \dp0=0pt \box0 \egroup}
\mpxshipout% line 10 ./mpsimple.mp
$A$%
\stopmpxshipout
\end{document}

If I try to " etex --parse-first-line mpa04972.tex" or "pdflatex mpa04972.tex", everything looks fine:


C:\tmp>etex --parse-first-line mpa04972.tex
This is pdfTeX, Version 3.1415926-2.5-1.40.14 (TeX Live 2013/W32TeX)
 restricted \write18 enabled.
entering extended mode
(./mpa04972.tex
LaTeX2e <2011/06/27>
Babel <3.9f> and hyphenation patterns for 78 languages loaded.
(c:/rt/texlive/2013/texmf-dist/tex/latex/base/article.cls
Document Class: article 2007/10/19 v1.4h Standard LaTeX document class
(c:/rt/texlive/2013/texmf-dist/tex/latex/base/size12.clo))
(c:/rt/texlive/2013/texmf-dist/tex/latex/base/inputenc.sty
(c:/rt/texlive/2013/texmf-dist/tex/latex/base/latin1.def))
(c:/rt/texlive/2013/texmf-dist/tex/latex/base/fontenc.sty
(c:/rt/texlive/2013/texmf-dist/tex/latex/base/t1enc.def))
No file mpa04972.aux.
[1{c:/rt/texlive/2013/texmf-var/fonts/map/pdftex/updmap/pdftex.map}]
(./mpa04972.aux) )<c:/rt/texlive/2013/texmf-dist/fonts/type1/public/amsfonts/cm
/cmmi12.pfb>
Output written on mpa04972.pdf (1 page, 8363 bytes).
Transcript written on mpa04972.log.

The resulting mpa04972.pdf contains the letter A with a vertical bar on the right hand side of the A.

I don't have a clue. Can anybody please give me a hint? Any help would be appreciated.

Thank you in advance
Ralf