re: egcs-1.1b C++ compile fails with redundant typedefs

re: egcs-1.1b C++ compile fails with redundant typedefs

[Jack Howarth]

   I am seeing a similiar problem under linuxppc using egcs 1.1b/
binutils 2.9.1.0.11. In building anything like ddd that uses
the macros in <sys/wait.h>, I have to explicitly expand the macros for
the code to compile. I believe this this the same bug.
                            Jack

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Jack W. Howarth, Ph.D.                                     231 Bethesda Avenue
NMR Facility Director                              Cincinnati, Ohio 45267-0524
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Re: egcs-1.1b C++ compile fails with redundant typedefs

[Alexandre Oliva]

Peter Schauer <Peter.Schauer@Regent.E-Technik.TU-Muenchen.DE> writes:

> egcs-1.1b reports an error with certain redundant typedefs, if the first
> typedef is in a header file and the redundant second typedef is in the
> main source file. An example is appended below.

I could reproduce the problem without the need for a separate include
file.  The problem will show up in the following code snippet:

> typedef void SIG_FUNC_TYP_I(int);
> typedef SIG_FUNC_TYP_I *SIG_TYP_I;
> typedef void SIG_FUNC_TYP_I(int);
> typedef SIG_FUNC_TYP_I *SIG_TYP_I;

Looks like, in spite of accepting the duplicate typedef of
SIG_FUNC_TYP_I, the type descriptor associated with the second typedef 
is different from the first one, so SIG_FUNC_TYP_I refer to different
types in lines 2 and 4, so the duplicate typedef of SIG_TYP_I is
rejected, as it corresponds to a typedef to an apparently different
type.

-- 
Alexandre Oliva
mailto:oliva@dcc.unicamp.br mailto:aoliva@acm.org
http://www.dcc.unicamp.br/~oliva
Universidade Estadual de Campinas, SP, Brasil

egcs-1.1b C++ compile fails with redundant typedefs

[Peter.Schauer]

egcs-1.1b reports an error with certain redundant typedefs, if the first
typedef is in a header file and the redundant second typedef is in the
main source file. An example is appended below.

Tracked it down to TYPE_MAIN_VARIANT being different for SIG_TYP_I
(they are the same for SIG_TYP_CP), so comptypes fails and the error message
is produced. I have no idea why they are different though.

PS: I do know that this code is ugly, and the redundant typedefs should
be avoided, but ...

pes@bier_1129$ cat tp2.h
typedef void SIG_FUNC_TYP_I(int);
typedef SIG_FUNC_TYP_I *SIG_TYP_I;
pes@bier_1130$ cat tp2.cc
#include "tp2.h"
typedef void SIG_FUNC_TYP_I(int);
typedef SIG_FUNC_TYP_I *SIG_TYP_I;

typedef void SIG_FUNC_TYP_CP(int);
typedef void SIG_FUNC_TYP_CP(int);
typedef SIG_FUNC_TYP_CP *SIG_TYP_CP;
typedef SIG_FUNC_TYP_CP *SIG_TYP_CP;
pes@bier_1131$ gcc -v
Reading specs from /usr/local/gnu/gcc-e1.1b/lib/gcc-lib/sparc-sun-solaris2.5/egcs-2.91.57/specs
gcc version egcs-2.91.57 19980901 (egcs-1.1 release)
pes@bier_1132$ gcc -c tp2.cc
tp2.cc:3: redefinition of `typedef void (* SIG_TYP_I)(int)'
tp2.h:2: `typedef void (* SIG_TYP_I)(int)' previously declared here

-- 
Peter Schauer			pes@regent.e-technik.tu-muenchen.de