Date: Tue, 11 Sep 2001 10:02:47 +0200 (IST)
From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
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To: Alex Vinokur <alexvn AT bigfoot DOT com>
cc: djgpp AT delorie DOT com
Subject: Re: gcc, gpp & option -v
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On Tue, 11 Sep 2001, Alex Vinokur wrote:

> 1. Why do _both 'gcc -v' and 'gpp -v'_ produce the same output?

No, they don't.  "gcc -v" says:

  d:/sys/djgpp/lib/gcc-lib/djgpp/2.953/cpp0.exe -lang-c -v -D__GNUC__=2

while "gpp -v" says:

  d:/sys/djgpp/lib/gcc-lib/djgpp/2.953/cpp0.exe -lang-c++ -v -D__GNUC__=2

See that "-lang-c++" in gpp's output?  That's the difference.

In other words, gpp by default assumes it is a compiling a C++
program, while gcc assumes it's a C program.

> 2. What is GNU CPP version ... ? (C compiler?)

It's the preprocessor.

> 3. 'gpp -v a.c' produces _C++ compiler_ version as well.
>    Why doesn't 'gpp -v' do the same thing?

The line

  GNU C++ version 2.95.3 20010315/djgpp (release) (djgpp) compiled by GNU
  C version 2.95.3 20010315/djgpp (release).

comes from the program cc1plus.exe invoked by gpp (that's one of the
lines you snipped).  cc1plus is the C++ compiler.  When you type just
"gpp -v", the compiler is not invoked at all, since there's nothing to
compile.  So cc1plus doesn't run and doesn't print anything.

> 4. Is there any option that produces _C++ compiler_ version ? :
>    %gpp <?-option>
>    GNU C++ version 2.95.3 20010315/djgpp (release) (djgpp) compiled by
> GNU C version 2.95.3 20010315/djgpp (release).

Try this:

  d:\sys\djgpp\lib\gcc-lib\djgpp\2.953\cc1plus -version < nul > nul