c++/6965: typedef'd void pointer not recognized as const

[hans-johnson at uiowa dot edu]

>Number:         6965
>Category:       c++
>Synopsis:       typedef'd void pointer not recognized as const
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          rejects-legal
>Submitter-Id:   net
>Arrival-Date:   Fri Jun 07 14:36:02 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     Hans J. Johnson
>Release:        gcc-c++-2.96-110 (i.e. redhat)
>Organization:
>Environment:
Redhat 7.3
>Description:
I get the following error:

[hjohnson@homepc FileReadTest]$ g++ -c fulltest.cpp
test.cpp: In function `void Write ()':
test.cpp:6: cannot convert `const void *' to `void *' for argument `2'
to `gzwrite (void *, void *, unsigned int)'

but from zlib.h:
   typedef void *voidp;
   extern int gzwrite (gzFile file, const voidp buf, unsigned len);

and code compiles if i change to:
 extern int gzwrite (gzFile file, const void * buf, unsigned len);
.

same thing happens when compiling with gcc as with g++.
   
>How-To-Repeat:
g++ -c fulltest.cpp
mv fulltest.cpp fulltest.c
gcc -c fulltest.c  (note need to change ::gzwrite to gzwrite)

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