c++/6930: different behavior in 3.1 and 3.0.4

c++/6930: different behavior in 3.1 and 3.0.4

[thomas]

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>Number:         6930
>Category:       c++
>Synopsis:       different behavior in 3.1 and 3.0.4
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          rejects-legal
>Submitter-Id:   net
>Arrival-Date:   Tue Jun 04 13:46:00 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     Thomas Koeller
>Release:        3.1
>Organization:
>Environment:
System: Linux sarkovy.koeller.dyndns.org 2.4.18 #3 Sam Mär 23 01:29:53 CET 2002 i686 unknown
Architecture: i686
host: i686-pc-linux-gnu
build: i686-pc-linux-gnu
target: i686-pc-linux-gnu
configured with: /home/thomas/src/gnu/gcc-3.1/configure --prefix=/opt/gcc-3.1 --with-gnu-as --with-gnu-ld --enable-languages=c,c++ --with-system-zlib --enable-threads=posix
>Description:
	The attached example program is accepted by gcc-3.0.4, but is rejected
	by gcc-3.1.
>How-To-Repeat:
	Compile this example program:

---	
extern "C" void func(void);
extern "C" void func(void) __attribute__((weak, alias("__func")));
void __func(void){}
---

      	These are the results:

bash-2.05a$ /opt/gcc-v3/bin/g++ -V 3.0.4 -fsyntax-only testprog.cxx
bash-2.05a$ /opt/gcc-v3/bin/g++ -V 3.1 -fsyntax-only testprog.cxx
testprog.cxx:2: `void func()' defined both normally and as an alias
testprog.cxx:2: weak declaration of `void func()' must precede definition

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