Debian Bug report logs - #22513
g++ problem with -fno-implement-inlines

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Avery Pennarun <apenwarr@worldvisions.ca>

To: submit@bugs.debian.org

Subject: g++ problem with -fno-implement-inlines

Date: Sat, 16 May 1998 15:27:03 -0400

Package: g++
Version: 2.90.28-0.1


Hi there,

I'm including a short program below.  It demonstrates two bugs in Debian's
current gcc/eg++ system.

(1) There is a problem with -fno-implement-inlines:

	~ $ g++ -O6 -fno-implement-inlines foo.cc
	/tmp/cca094331.o(.rodata+0x34): undefined reference to `B::~B(void)'
	collect2: ld returned 1 exit status
	
	~ $ g++ -O6 foo.cc
		(success)

(2) libgcc in the 'gcc' installation is incompatible with the egcs one:

	~ $ g++ foo.cc -c
	
	~ $ gcc foo.o
	foo.o: In function `B::B(void)':
	foo.o(.text+0xfd): undefined reference to `_eh_pc'
	foo.o(.text+0x106): undefined reference to `_throw'
	foo.o(.text+0x131): undefined reference to `terminate(void)'
	foo.o: In function `Main':
	foo.o(.text+0x1f0): undefined reference to `_eh_pc'
	foo.o(.text+0x1f9): undefined reference to `_throw'
	foo.o(.text+0x202): undefined reference to `_eh_pc'
	foo.o(.text+0x20b): undefined reference to `_throw'
	foo.o(.text+0x231): undefined reference to `terminate(void)'
	foo.o: In function `B type_info function':
	foo.o(.text+0x273): undefined reference to `_rtti_si'
	foo.o: In function `A type_info function':
	foo.o(.text+0x2d7): undefined reference to `_rtti_user'

	~ $ gcc foo.o /usr/lib/gcc-lib/i486-linux/egcs-2.90.28/libgcc.a
		(success)

The source code for my test program follows.  Thanks for any help you can
provide.

Have fun,

Avery


/* foo.cc */

#include <stdio.h>

class A
{
public:
    A();
    virtual ~A();
};

class B : public A
{
public:
    B();
    virtual void chicken();
};


A::A()
{
    printf("Hello, A\n");
}


A::~A()
{
    printf("Goodbye, A\n");
}


B::B()
{
    printf("Hello, B\n");
}


void B::chicken()
{
    printf("B chicken\n");
}


int main()
{
    B b;
    b.chicken();
    return 0;
}

Message #10 received at submit@bugs.debian.org (full text, mbox, reply):

From: Dirk Eddelbuettel <edd@debian.org>

To: Avery Pennarun <apenwarr@worldvisions.ca>, 22513@bugs.debian.org

Cc: submit@bugs.debian.org

Subject: Re: Bug#22513: g++ problem with -fno-implement-inlines

Date: Sat, 16 May 1998 16:08:00 -0400 (EDT)

  Avery> Package: g++ 
  Avery> Version: 2.90.28-0.1

[...]

  Avery> (2) libgcc in the 'gcc' installation is incompatible with the egcs
  Avery> one:

[stuff deleted which shows that gcc doesn't find the C++ libs] 

You want egcc as you're mixing the front-end (egcc) with the C++ backend :

	edd@miles:/tmp> egcc foo.cc -o foo
	edd@miles:/tmp> ./foo
	Hello, A
	Hello, B
	B chicken
	Goodbye, A

I was bitten by the same thing last night with a new Octave built. We have
'gcc' from gcc-2.7.x, and 'egcc' from egcs. If you mix C and C++ (and
Fortran), you probably want 'CC=egcc' in your Makefile. At least, that's what
helped me with Octave.

-- 
mailto:edd@debian.org              According to the latest official figures, 
http://rosebud.ml.org/~edd      43% of all statistics are totally worthless.

Message #20 received at 22513@bugs.debian.org (full text, mbox, reply):

From: Avery Pennarun <apenwarr@worldvisions.ca>

To: Dirk Eddelbuettel <edd@debian.org>, 22513@bugs.debian.org

Subject: Re: Bug#22513: g++ problem with -fno-implement-inlines

Date: Sat, 16 May 1998 16:54:55 -0400

On Sat, May 16, 1998 at 04:08:00PM -0400, Dirk Eddelbuettel wrote:

>   Avery> Package: g++ 
>   Avery> Version: 2.90.28-0.1
> 
> [...]
> 
>   Avery> (2) libgcc in the 'gcc' installation is incompatible with the egcs
>   Avery> one:
> 
> [stuff deleted which shows that gcc doesn't find the C++ libs] 
> 
> You want egcc as you're mixing the front-end (egcc) with the C++ backend :
> 
> 	edd@miles:/tmp> egcc foo.cc -o foo
> 	edd@miles:/tmp> ./foo
> 	Hello, A
> 	Hello, B
> 	B chicken
> 	Goodbye, A

Perhaps, but I think it's a bug that I should have to do this.  Normal
people (not Debian maintainers) will be trying to compile things with the
Debian compiler setup, and this is needlessly(?) confusing.

Thanks for the response though.  The solution I'm currently using is even
hackier:  I edited /usr/lib/gcc-lib/i486-linux/2.7.2.3/specs to link in the
egcs-2.90.28 version of libgcc.a, as well as its own.  This eliminates the
undefined references.

It should be allowable to compile an object file with g++ and then link it
with gcc, as long as the stdc++ features aren't in use.  It always worked
before.  I do this in my programs to avoid linking uselessly with libstdc++.

Thanks for your message,

Avery

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Message #32 received at 22513@bugs.debian.org (full text, mbox, reply):

From: Matthias Klose <doko@cs.tu-berlin.de>

To: 22513@bugs.debian.org, Avery Pennarun <apenwarr@worldvisions.ca>

Subject: Debian bug #22513 partly fixed.

Date: Sun, 1 Nov 1998 20:02:09 +0100 (MET)

The first part of this bug is fixed in the egcs-1.1.1 prerelease (see
http://master.debian.org/~doko/egcs-i386).

Not sure with the second part. I added a paragraph to the
README.Debian file, which already describes this situation.

Not sure if this bug can be closed as long as Debian provides two
compiler versions. Another solution would be the editing of the gcc
specs; but this would mean a new gcc27 package with every egcs
release.

Message #39 received at 22513-done@bugs.debian.org (full text, mbox, reply):

From: Matthias Klose <doko@cs.tu-berlin.de>

To: 42532-done@bugs.debian.org, 35906-done@bugs.debian.org, 39098-done@bugs.debian.org, 36182-done@bugs.debian.org, 42584-done@bugs.debian.org, 42585-done@bugs.debian.org, 42602-done@bugs.debian.org, 42742-done@bugs.debian.org, 42743-done@bugs.debian.org, 43002-done@bugs.debian.org, 42622-done@bugs.debian.org, 21122-done@bugs.debian.org, 22513-done@bugs.debian.org, 28417-done@bugs.debian.org, 41302-done@bugs.debian.org, 41313-done@bugs.debian.org, 40659-done@bugs.debian.org

Subject: Fixed in gcc-2.95.1-0pre1

Date: Mon, 16 Aug 1999 10:43:16 +0200 (MET DST)

These bugs are fixed in the gcc-2.95.1-0pre1 and related g++,
libstdc++, cpp packages. Binary packages are currently uploaded for
the i386-hurd architecture.

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