>Submitter-Id: net
>Originator: Akim Demaille
>Organization:
>Confidential: no
>Synopsis: warning: `e' has incomplete type without location
>Severity:
>Priority:
>Category: c++
>Class:
>Release: 3.3.2 (Debian) (Debian testing/unstable)
>Environment:
System: Linux nostromo 2.4.22 #1 SMP mer sep 17 19:49:48 CEST 2003 i686
GNU/Linux
Architecture: i686
host: i486-pc-linux-gnu
build: i486-pc-linux-gnu
target: i486-pc-linux-gnu
configured with: ../src/configure -v
--enable-languages=c,c++,java,f77,pascal,objc,ada,treelang --prefix=/usr
--mandir=/usr/share/man --infodir=/usr/share/info
--with-gxx-include-dir=/usr/include/c++/3.3 --enable-shared --with-system-zlib
--enable-nls --without-included-gettext --enable-__cxa_atexit
--enable-clocale=gnu --enable-debug --enable-java-gc=boehm
--enable-java-awt=xlib --enable-objc-gc i486-linux
>Description:
The following piece of code:
/tmp % cat -n foo.cc nostromo Err 1
1 class Exp;
2 Exp* e;
3
4 int
5 main (void)
6 {
7 delete e;
8 }
Triggers an error with 3.2, but a warning with both 3.3 and 3.4. The warning
is:
/tmp % g++-3.2 -Wall foo.cc; echo STATUS: $? nostromo 17:49
foo.cc: In function `int main()':
foo.cc:2: `e' has incomplete type
foo.cc:1: forward declaration of `struct Exp'
STATUS: 1
/tmp % g++-3.3 -Wall foo.cc; echo STATUS: $? nostromo 17:50
foo.cc: In function `int main()':
foo.cc:2: warning: `e' has incomplete type
foo.cc:1: warning: forward declaration of `struct Exp'
STATUS: 0
/tmp % g++-3.4 -Wall foo.cc; echo STATUS: $? nostromo 17:50
foo.cc: In function `int main()':
foo.cc:2: AVERTISSEMENT: e a un type incomplet
foo.cc:1: AVERTISSEMENT: forward declaration of `struct Exp'
STATUS: 0
as you can see, the problem is that the class Exp is unknown when the
dtor is called via delete. Nevertheless the reason for the complaints
is _never_ made explicit: it took me a while to understand that it
is the call to delete that was responsible for the warning is my Real
Life Code. I would suggest that G++ would point to the line 7
when saying ``e' has incomplete type' instead of pointing to the
declaration of `e' (or its declaration could be added, but the current
way seem to be complaining that `e's declaration is incomplete!).
Thanks for all the good work!
>How-To-Repeat:
Compile the sample above.
>Fix:
See above.
