Re: c++/7327: -isystem and template linkage

Re: c++/7327: -isystem and template linkage

[Patrick Frants]

The following reply was made to PR c++/7327; it has been noted by GNATS.

From: Patrick Frants <patrick.frants@quintiq.com>
To: gcc-gnats@gcc.gnu.org, gcc-bugs@gcc.gnu.org, gcc-prs@gcc.gnu.org,
   hoel@germanlloyd.org, jason@gcc.gnu.org
Cc:  
Subject: Re: c++/7327: -isystem and template linkage
Date: Fri, 21 Feb 2003 22:31:34 +0100

 This one drove me *crazy* until I finally found this bug report :-)
 
 Any chance it is going to be fixed shortly? :-)
 
 Patrick
 
 http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit- 
 trail&database=gcc&pr=7327
 
 -- 
 Patrick Frants
 Software Architect
 Quintiq
 
 Tel: +31 (0)73 691 07 39
 Mob: +31 (0)654 23 39 67
 patrick.frants@quintiq.com
 
 www.quintiq.com

Re: c++/7327: -isystem and template linkage

[Ben Hines]

The following reply was made to PR c++/7327; it has been noted by GNATS.

From: Ben Hines <bhines@alumni.ucsd.edu>
To: gcc-gnats@gcc.gnu.org,
 gcc-prs@gcc.gnu.org,
 hoel@germanlloyd.org,
 gcc-bugs@gcc.gnu.org,
 jason@gcc.gnu.org
Cc:  
Subject: Re: c++/7327: -isystem and template linkage
Date: Sun, 3 Nov 2002 20:21:19 -0800

 This bug# 7327 also affects Apple's GCC on Mac OS X. Also, "idirafter" 
 is also affected in addition to "isystem".
 
 To reproduce on mac os x:
 
 in conftest.cpp:
 
 #include <conftest.h>
 int main ()
 {
    return 0;
 }
 
 in conftest.h in pwd:
 #include <iosfwd>
 
 Compile with:
 
 g++ -idirafter `pwd` conftest.cpp -save-temps
 OR
 g++ -isystem `pwd` conftest.cpp -save-temps
 
 RESULT:
   % g++ -idirafter `pwd` conftest.cpp -save-temps
 In file included from /usr/include/gcc/darwin/3.1/g++-v3/iosfwd:45,
                   from /Users/ben/tempbug/conftest.h:1,
                   from conftest.cpp:2:
 /usr/include/gcc/darwin/3.1/g++-v3/bits/stringfwd.h:49: template with C 
 linkage
 /usr/include/gcc/darwin/3.1/g++-v3/bits/stringfwd.h:57: template with C 
 linkage
 /usr/include/gcc/darwin/3.1/g++-v3/bits/stringfwd.h:61: template with C 
 linkage
 -snip more-
 
 REGRESSION:
 If i include <iosfwd> directly in conftest.cpp, i don't get the 
 problem. It has to be in a header found by isystem.
 
 % gcc -v
 Reading specs from /usr/libexec/gcc/darwin/ppc/3.1/specs
 Thread model: posix
 Apple Computer, Inc. GCC version 1161, based on gcc version 3.1 
 20020420 (prerelease)
 
 % uname -a
 Darwin lsanca1-ar8-4-60-073-020.lsanca1.dsl-verizon.net 6.1 Darwin 
 Kernel Version 6.1: Fri Sep  6 23:24:34 PDT 2002;
 root:xnu/xnu-344.2.obj~2/RELEASE_PPC  Power Macintosh powerpc
 
 -Ben
 

Re: c++/7327: -isystem and template linkage

[abrahams]

Synopsis: -isystem and template linkage

Responsible-Changed-From-To: unassigned->jason
Responsible-Changed-By: abrahams
Responsible-Changed-When: Sat Oct 12 12:04:44 2002
Responsible-Changed-Why:
    Becase I know Jason will know what I mean when I say what I wrote in the release-note field... (not sure where to add more info)

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=7327

Re: c++/7327: -isystem and template linkage

[Berthold Höllmann]

The following reply was made to PR c++/7327; it has been noted by GNATS.

From: =?ISO-8859-15?Q?Berthold_H=F6llmann?= <hoel@germanlloyd.org>
To: <neil@gcc.gnu.org>
Cc: <gcc-bugs@gcc.gnu.org>,
	<gcc-prs@gcc.gnu.org>,
	<nobody@gcc.gnu.org>,
	<gcc-gnats@gcc.gnu.org>
Subject: Re: c++/7327: -isystem and template linkage
Date: 13 Aug 2002 13:52:50 +0200

 neil@gcc.gnu.org writes:
 
 > Old Synopsis: strange error through using -isystem
 > New Synopsis: -isystem and template linkage
 >=20
 > State-Changed-From-To: open->analyzed
 > State-Changed-By: neil
 > State-Changed-When: Tue Aug 13 04:12:48 2002
 > State-Changed-Why:
 >     One way gives your headers extern "C" wrappers, the other
 >     doesn't.  I'm not sure what the fix is, or even if it should be
 fixed.
 >=20
 >
 http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=3Dview%20audit-trail&database=3D=
 g
 cc&pr=3D7327
 >=20
 
 If I generate the preprocessed files using
 
    g++ -E -isystem /home/hoel/work/boost/boost err.cxx -o erra
 
 and
 
    g++ -E -I /home/hoel/work/boost/boost err.cxx -o errb
 
 and call=20
 
    diff err? | grep -v "^[<>] #" | grep -v "\---"
 
 afterwards, the only output are the different lines. So why are the
 C++ lines wrapped extern "C" using -isystem but not using -I? I'm also
 not sure what the fix is, but shure it should be fixed.
 
 Greetings
 
 Berthold
 --=20
 Dipl.-Ing. Berthold H=F6llmann   __   Address:
 hoel@germanlloyd.org        G /  \ L Germanischer Lloyd
 phone: +49-40-36149-7374    -+----+- Vorsetzen 32/35    P.O.Box 111606
 fax  : +49-40-36149-7320      \__/   D-20459 Hamburg    D-20416 Hamburg
 
 
 
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Re: c++/7327: -isystem and template linkage

[neil]

Old Synopsis: strange error through using -isystem
New Synopsis: -isystem and template linkage

State-Changed-From-To: open->analyzed
State-Changed-By: neil
State-Changed-When: Tue Aug 13 04:12:48 2002
State-Changed-Why:
    One way gives your headers extern "C" wrappers, the other
    doesn't.  I'm not sure what the fix is, or even if it should be fixed.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=7327