compile error with gcc 4

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compile error with gcc 4

Owen McCabe
Hi,
I ran into a little trouble compiling lucene4c with a recent version
of gcc and I thought I'd document it here in case anyone else ran into
it. More specifically:

$ g++ --version
g++ (GCC) 4.0.1 20050517 (prerelease) (Debian 4.0.0-7ubuntu6~5.04ubp1)

gave me error messages like:

./include/org/apache/lucene/document/Field.h:24: error: global
qualification of class name is  invalid before : token

This seems to stem from gcc refusing to compile code like this:

namespace extra {
  class test;
}

class ::extra::test {
};

int main() {
}

That compiles just fine under both gcc 3.3 and the latest version of
comeau. The only reference I could find to this on google was:

http://gcc.gnu.org/ml/gcc-regression/2004-04/msg00018.html

So I'm not sure if it's back to compiling in a newer version or not yet.

Anyway, it's easy to work around it by replacing all the "class
::org"s in the header files with "class org" in lines like this:

class ::org::apache::lucene::document::Field : public ::java::lang::Object

So I'm not sure if the extra ::s are actually needed or not.

-owen
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Re: compile error with gcc 4

Garrett Rooney
Owen McCabe wrote:

> Hi,
> I ran into a little trouble compiling lucene4c with a recent version
> of gcc and I thought I'd document it here in case anyone else ran into
> it. More specifically:
>
> $ g++ --version
> g++ (GCC) 4.0.1 20050517 (prerelease) (Debian 4.0.0-7ubuntu6~5.04ubp1)
>
> gave me error messages like:
>
> ./include/org/apache/lucene/document/Field.h:24: error: global
> qualification of class name is  invalid before : token
>
> This seems to stem from gcc refusing to compile code like this:
>
> namespace extra {
>   class test;
> }
>
> class ::extra::test {
> };
>
> int main() {
> }
>
> That compiles just fine under both gcc 3.3 and the latest version of
> comeau. The only reference I could find to this on google was:
>
> http://gcc.gnu.org/ml/gcc-regression/2004-04/msg00018.html
>
> So I'm not sure if it's back to compiling in a newer version or not yet.
>
> Anyway, it's easy to work around it by replacing all the "class
> ::org"s in the header files with "class org" in lines like this:
>
> class ::org::apache::lucene::document::Field : public ::java::lang::Object
>
> So I'm not sure if the extra ::s are actually needed or not.

Weird.  It's kind of odd that g++ is failing to compile headers
generated by gcj...  I'd say that unless it's actually failing for a
released version of gcc there isn't a whole lot of point in us doing
anything about it though.

-garrett