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Date: Sat, 25 Oct 2003 12:34:11 +0100
From: Richard Dawe <rich AT phekda DOT freeserve DOT co DOT uk>
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To: djgpp AT delorie DOT com
Subject: Re: -ansi breaks gpp?
References: <NHBBIOOPELAFBJKHDEBCEENMCAAA DOT max_payne AT hotpop DOT com>
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Hello.

Kushal Kumaran wrote:
> 
> I am unable to use the -ansi switch with the most trivial C++
> programs:
> 
> -- Begin test.cc
> #include<cmath>
> 
> int main() {
> }
> -- End test.cc
> 
> -- Begin compilation transcript (copied and pasted from Emacs)
> cd c:\foo\cc\
> gpp -v -ansi -o test.exe test.cc
> Reading specs from c:/djgpp/lib/gcc-lib/djgpp/3.32/specs
> Configured with: /devel/gnu/gcc/3.3/gnu/gcc-3.32/configure
> i586-pc-msdosdjgpp --prefix=/dev/env/DJDIR --disable-nls
> Thread model: single
> gcc version 3.3.2
> 
> c:/djgpp/lib/gcc-lib/djgpp/3.32/cc1plus.exe -quiet -v -D__GNUC__=3 -D_
> _GNUC_MINOR__=3 -D__GNUC_PATCHLEVEL__=2 -remap -imacros
> c:/djgpp/lib/gcc-lib/djgpp/3.32/djgpp.ver
> test.cc -D__GNUG__=3 -quiet -dumpbase test.cc -ansi -auxbase
> test -ansi -version -o c:/djgpp/tmp/cc2dYfBE.s
> GNU C++ version 3.3.2 (djgpp)
>         compiled by GNU C version 3.3.2.
> GGC heuristics: --param ggc-min-expand=30 --param
> ggc-min-heapsize=4096
> ignoring nonexistent directory "c:/djgpp/djgpp/include"
> #include "..." search starts here:
> #include <...> search starts here:
>  c:/djgpp/lang/cxx/3.32
>  c:/djgpp/lang/cxx/3.32/djgpp
>  c:/djgpp/lang/cxx/3.32/backward
>  c:/djgpp/lib/gcc-lib/djgpp/3.32/include
>  c:/djgpp/include
> End of search list.
> In file included from test.cc:1:
> c:/djgpp/lang/cxx/3.32/cmath:107: error: `acosf' not declared
[snip]

DJGPP is not C99-compliant. The g++ headers are trying to use declarations of
C99 functions.

DJGPP 2.04 will be more C99-compliant. But it still may not work. I'll see if
I can fix the development version (in CVS) this weekend.

> 
> The problem goes away if
> 1. certain headers are not included(including only string works,
>    iostream doesn't)
> 2. -ansi switch is not used, or
> 3. C programs are compiled, with or without -ansi.
> 
> Am I doing something wrong? Does the -ansi switch simply not work
> with C++? I couldn't find any references to the -ansi switch at
> google.

Nope, it doesn't work.

> Also, in the above messages, there is a complaint about 'nonexistent
> directory "c:/djgpp/djgpp/include"'. Where does this come from? I
> removed
> my djgpp directory and unzipped just djdev203, bnu214, gcc332, gpp332
> and tried again, with the same errors.

I suspect one of the include file search paths built into the compiler is
bogus. I can't see one, from your output with -v, though. Weird.

This is what I have for my search paths:

bash-2.04$ echo | gpp -v -E -
Reading specs from c:/djgpp/lib/gcc-lib/djgpp/3.23/specs
Configured with: /devel/gnu/gcc/3.2/gnu/gcc-3.23/configure i586-pc-msdosdjgpp
--
prefix=/dev/env/DJDIR --disable-nls
Thread model: single
gcc version 3.2.3
 c:/djgpp/lib/gcc-lib/djgpp/3.23/cpp0.exe -lang-c -v -D__GNUC__=3
-D__GNUC_MINOR__=2 -D__GNUC_PATCHLEVEL__=3 -D__GXX_ABI_VERSION=102 -D__MSDOS__
-D__GO32__ -D__DJGPP__=2 -D__unix__ -D__MSDOS__ -D__GO32__ -D__DJGPP__=2
-D__unix__ -Asystem=msdos -Asystem=unix -D__NO_INLINE__ -D__STDC_HOSTED__=1
-Acpu=i386 -Amachine=i386
-Di386 -D__i386 -D__i386__ -D__tune_i586__ -D__tune_pentium__ -DMSDOS -DGO32
-DDJGPP=2 -Dunix -remap -imacros c:/djgpp/lib/gcc-lib/djgpp/3.23/djgpp.ver -
GNU CPP version 3.2.3 (cpplib) (80386, BSD syntax)
ignoring nonexistent directory "c:/djgpp/djgpp/include"
#include "..." search starts here:
#include <...> search starts here:
 c:/djgpp/lib/gcc-lib/djgpp/3.23/include
 c:/djgpp/include
End of search list.
# 1 "<stdin>"
# 1 "<built-in>"
# 1 "<command line>"
# 1 "c:/djgpp/lib/gcc-lib/djgpp/3.23/djgpp.ver" 1
# 1 "c:/djgpp/include/sys/version.h" 1 3
# 2 "c:/djgpp/lib/gcc-lib/djgpp/3.23/djgpp.ver" 2
# 2 "<command line>" 2
# 1 "<stdin>"

Bye, Rich =]

-- 
Richard Dawe [ http://www.phekda.freeserve.co.uk/richdawe/ ]

"You can't evaluate a man by logic alone." -- McCoy, "I, Mudd", Star Trek