sympy/sympy — pull request #1415 by tkf (2012-07-13 19:41:13+00:00)
Title: Add info build target in doc/Makefile

I added build targets to compile SymPy document into an info file. However, it does not work as is. I get the following error when tried to build (using `make info`).

I need to use `makeinfo --force --no-split -o sympy.info sympy.texi` to force compile. Probably this is a bug in texinfo Sphinx writer. I will report upstream.

Can this PR be merged once it is fixed in the upstream (Sphinx)?

```
Running Texinfo files through makeinfo...
make -C _build/texinfo info
make[1]: Entering directory `/.../sympy/doc/_build/texinfo'
makeinfo --no-split -o 'sympy.info' 'sympy.texi'
sympy.texi:136376: Node `Python Module Index' previously defined at line 136213.
/.../sympy/doc/_build/texinfo//sympy.texi:136213: Prev field of node `Python Module Index' not pointed to.
/.../sympy/doc/_build/texinfo//sympy.texi:136213: This node (Python Module Index) has the bad Next.
/.../sympy/doc/_build/texinfo//sympy.texi:135446: Next field of node `About' not pointed to (perhaps incorrect sectioning?).
/.../sympy/doc/_build/texinfo//sympy.texi:136213: This node (Python Module Index) has the bad Prev.
makeinfo: Removing output file `sympy.info' due to errors; use --force to preserve.
make[1]: *** [sympy.info] Error 1
make[1]: Leaving directory `/.../sympy/doc/_build/texinfo'
make: *** [info] Error 2
```