Add command-line option to print compiler version

[schuetzm]

Requested by a user here:
http://forum.dlang.org/thread/mailman.836.1400331667.2907.digitalmars-d-learn@puremagic.com

[ghost]

Huh?

[ghost]

Oh, 32/64. LOL.

[ibuclaw]

It's still bad - there is global.params.is64bit if you really must check that.

[schuetzm]

It was already like this in usage(), where I moved it from.

But global.params.is64bit cannot be used, because it determines the word size of the generated code (via -m32/-m64), while this string is supposed to print the word size of the compiler itself.

[WalterBright]

Type dmd with no switches and it will print the version:

C:\cbx>dmd
DMD32 D Compiler v2.065
Copyright (c) 1999-2014 by Digital Mars written by Walter Bright
Documentation: http://dlang.org/
Usage:
  dmd files.d ... { -switch }

  files.d        D source files
  @cmdfile       read arguments from cmdfile
  -allinst       generate code for all template instantiations
  -c             do not link
  -cov           do code coverage analysis
  -cov=nnn       require at least nnn% code coverage
  -D             generate documentation
  -Dddocdir      write documentation file to docdir directory
  -Dffilename    write documentation file to filename
  -d             silently allow deprecated features
  -dw            show use of deprecated features as warnings (default)
  -de            show use of deprecated features as errors (halt compilation)
  -debug         compile in debug code
  -debug=level   compile in debug code <= level
  -debug=ident   compile in debug code identified by ident
  -debuglib=name    set symbolic debug library to name
  -defaultlib=name  set default library to name
  -deps          print module dependencies (imports/file/version/debug/lib)
  -deps=filename write module dependencies to filename (only imports)
  -g             add symbolic debug info
  -gc            add symbolic debug info, optimize for non D debuggers
  -gs            always emit stack frame
  -gx            add stack stomp code
  -H             generate 'header' file
  -Hddirectory   write 'header' file to directory
  -Hffilename    write 'header' file to filename
  --help         print help
  -Ipath         where to look for imports
  -ignore        ignore unsupported pragmas
  -inline        do function inlining
  -Jpath         where to look for string imports
  -Llinkerflag   pass linkerflag to link
  -lib           generate library rather than object files
  -m32           generate 32 bit code
  -m64           generate 64 bit code
  -main          add default main() (e.g. for unittesting)
  -man           open web browser on manual page
  -map           generate linker .map file
  -boundscheck=[on|safeonly|off]   bounds checks on, in @safe only, or off
  -noboundscheck no array bounds checking (deprecated, use -boundscheck=off)
  -O             optimize
  -o-            do not write object file
  -odobjdir      write object & library files to directory objdir
  -offilename    name output file to filename
  -op            preserve source path for output files
  -profile       profile runtime performance of generated code
  -property      enforce property syntax
  -release       compile release version
  -run srcfile args...   run resulting program, passing args
  -shared        generate shared library (DLL)
  -transition=id show additional info about language change identified by 'id'
  -transition=?  list all language changes
  -unittest      compile in unit tests
  -v             verbose
  -vcolumns      print character (column) numbers in diagnostics
  -version=level compile in version code >= level
  -version=ident compile in version code identified by ident
  -vtls          list all variables going into thread local storage
  -vgc           list all hidden gc allocations
  -w             warnings as errors (compilation will halt)
  -wi            warnings as messages (compilation will continue)
  -X             generate JSON file
  -Xffilename    write JSON file to filename

[schuetzm]

Well, the user wanted a way to output only the version...

[yebblies]

Well, the user wanted a way to output only the version...

Teach them to use grep.

[tbrowder]

How about Windows users?

[ghost]

rdmd -m32 --force --eval=writeln(__VERSION__);