preprocessor/6076: cross-compiled libcpp handles CPLUS_INCLUDE_PATH wrong

[f_ker@yahoo.co.uk]

>Number:         6076
>Category:       preprocessor
>Synopsis:       cross-compiled libcpp handles CPLUS_INCLUDE_PATH wrong
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    unassigned
>State:          open
>Class:          rejects-legal
>Submitter-Id:   net
>Arrival-Date:   Wed Mar 27 19:36:00 PST 2002
>Closed-Date:
>Last-Modified:
>Originator:     f_ker@yahoo.co.uk
>Release:        3.0.4
>Organization:
>Environment:
host=build=i686-pc-linux-gnu
target=arm-thumb-elf
>Description:
Putting any file with templates in it in the CPLUS_INCLUDE_PATH and running it through (in my case) the arm-thumb-elf-g++ libcpp on host i686-pc-linux-gnu (gcc 3.0.4) produces an error "template with C linkage" pointing to declaration of templatised class.

>How-To-Repeat:
Put the following in a file (lets call it dummy.hh):
template<typename T>
struct Dummy
{
};

Put dummy.hh somewhere in CPLUS_INCLUDE_PATH (but not in current directory)

Put the following in another file (lets call it main.cc):
#include <dummy.hh>

do a 'arm-thumb-elf-g++ main.cc'.

Error:
In file included from main.cc:1:
/home/foobar/include/dummy.hh:2: template with C linkage


As far as I know, it only gives an error when using 'arm-thumb-elf-g++' on 'i686-pc-linux-gnu' host/build.  But when using native 'i686-pc-linux-gnu-g++', all is well and dandy.  Very strange.
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: