Adding new functions this_line, this_file, this_counter

[bstarynk]

This patch add new functions :

• $(this_line) - inspired by __LINE__ in C and expanded to the current file name (e.g. Makefile)
• $(this_file) - inspired by __FILE__ in C and expanded to the current line number (e.g. 123 if appearing in line 123 of your GNUmakefile
• $(this_counter), inspired by __COUNTER__ from GCC preprocessor

The documentation is wrong and needs some fix.

Also, the GNUremakefile is also considered as a name.

[rocky]

See comment. I am assuming a invetent deletion of a line.

Otherwise, this is great! Many thanks!

[rocky]

I'm getting an in build because this @node line is missing:

make
Making all in lib
make[1]: Entering directory '/tmp/remake/lib'


make.texi:12429: @xref reference to nonexistent node `Conditional Functions'
make.texi:12435: @xref reference to nonexistent node `Conditional Functions'
make.texi:12442: @xref reference to nonexistent node `Conditional Functions'
make.texi:7030: @menu reference to nonexistent node `Conditional Functions'
make.texi:278: @detailmenu reference to nonexistent node `Conditional Functions'
make.texi:7455: Next reference to nonexistent `Conditional Functions'
make.texi:7708: Prev reference to nonexistent `Conditional Functions'
Makefile:918: *** [make.info] error 1

[bstarynk]

Could you help (perhaps by patching the pull request). I am not familiar witrh texinfo. But you could use the C code and improve/correct the documentation. Thanks. Basile Starynkevitch

[rocky]

Ok - #116 started. (I thought when you open a PR there's a button that allows maintainers to add more commits. I didn't see that here so a new PR was started).

I don't see though that the this_ functions do anything. See that PR for details.