* Possible bug in gcc (Please Help)...
@ 2002-05-15 10:44 Thomas J Amato
2002-05-15 11:05 ` John Love-Jensen
0 siblings, 1 reply; 2+ messages in thread
From: Thomas J Amato @ 2002-05-15 10:44 UTC (permalink / raw)
To: gcc, gcc-help
Hi,
I created a small test case which gets the following error (using 3.0.3 on
Solaris 2.7):
gcc -x c++ -c enum_test.h
enum_test.h:2: use of enum `colors' without previous declaration
<<snip enum_test.h>>
enum colors;
void func1(colors var1);
Is this a bug in gcc? I can forward declare a class, struct, or union but
not an enum. If this is a bug has it been fixed in 3.0.4 or 3.1? Any help
would be great.
Thanks,
Tom
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Possible bug in gcc (Please Help)...
2002-05-15 10:44 Possible bug in gcc (Please Help) Thomas J Amato
@ 2002-05-15 11:05 ` John Love-Jensen
0 siblings, 0 replies; 2+ messages in thread
From: John Love-Jensen @ 2002-05-15 11:05 UTC (permalink / raw)
To: Thomas J Amato, gcc, gcc-help
Hi Tom,
You cannot forward declare an enum in C++.
The compiler can use a {signed|unsigned|nonsigned} char, short or int for
it. But the compiler doesn't know what it is using until it sees the enum's
definition. If it presumed that an enum was 1 byte, 2 byte, 4 byte,
whatever, you may end up with an unfortunate scenario.
My SAS/C++ compiler allows...
signed short enum Foo { kOne = 1, kTwo, kThree };
(Or was it "enum signed short Foo { ..."?)
...but that's a SAS/C++ idiosyncratic extension to C++. In that situation,
you could have forward declaration of the enum.
--Eljay
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