Error: Template with C linkage

[nobody]

My email:
valeika@email.unc.edu

I'm a C++ noob, so thanks for looking this over.  I am
trying to use the boost graph library for an infection
transmission project.  However, I can't get the BGL to
work.  In even a simple program that just has:

#include <boost\graph\xxxx.hpp>

will not compile.  I get hundreds of template with c
linkage errors.  I'm not sure where to go from here.  I
am using a Mac G5 and am using xcode to edit, build,
compile and run my code.  Xcode uses the gcc 3.3.

Thanks,
Steve

[Jonathan Turkanis]

Logged In: YES 
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There's no file named boost\graph\xxxx.hpp.

Seriously, you need to say what file caused the error, and
provide at least some of the error messages.

Also, you should use forward slashes.

Jonathan Turkanis

[pulco-citron]

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user_id=625189

I'm having the same kind of errors, I think.

I'm using a powerpc with darwin 7.8.0, compiling with gcc
3.3 (apple build) and gcc 3.4.3.

Not a single boost source file compiles, in fact: every time
a boost .hpp refers to some STL header, tons of "error:
template with C linkage" come up. g++ mistakenly assumes
that such included files have C linkage.

IMHO, that can be corrected with the adequate compiler flag
(which one ?)

[stevehartwell]

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user_id=962957

I have determined one way this problem can occur, and it's unrelated to 
boost.  (I've googled and searched the boost archives but I haven't found a 
resolution for this problem yet).

It seems that with gcc 3.3 (the MacOS X version I'm using), if any headers 
are found in the paths found by -isystem parameters, those header files 
will be compiled with C linkage, regardless of the source language being 
compiled (e.g. g++ or /usr/bin/gcc-3.3 -x c++ ...)

Here's a transcript of a terminal session showing the problem:

$ mkdir /tmp/sys
$ ed
a
template <class T> inline void foo(T& t) { }
.
w /tmp/sys/foo.hpp
45
q
$ ed
a
/* */
#include "foo.hpp"

int main(int argc, char **argv) { return 0; }
.
w foo.cpp
72
q
$ cc -isystem /tmp/sys foo.cpp
In file included from foo.cpp:2:
/tmp/sys/foo.hpp:1: error: template with C linkage
~
$ g++ -isystem /tmp/sys foo.cpp
In file included from foo.cpp:2:
/tmp/sys/foo.hpp:1: error: template with C linkage
$

[david_abrahams]

Logged In: YES 
user_id=52572
Originator: NO

Closing because the Graph developers use MacOSX and presumably it works for them.  Feel free to reopen if this is inappropriate.

[anonymous]

same problems.

gcc-4.0 i686-apple-darwin8-g++-4.0.1

error: g++ -g -Wall -Wno-unused -I. -I/usr/include/libxml2 -I/usr/local/include -c main.cc -o main.o /usr/include/c++/4.0.0/bits/stl_relops.h:118: error: template with C linkage /usr/include/c++/4.0.0/bits/stl_relops.h:131: error: template with C linkage /usr/include/boost/checked_delete.hpp:29: error: template with C linkage

I installed boost to prefix /usr, had to make a symbolic link ln -s boost-1_34_1 boost

[Douglas Gregor]

Which version Mac OS X are you using?

Does a simple program including just <vector> compile?

Steve Hartwell seems to have found the same problem on Mac OS X, and in his case it was unrelated to Boost.

[Douglas Gregor]

Without knowing if this problem is specific to the BGL or is a general C++ installation problem, there isn't anything we can do. Closing this ticket.