Article View: gnu.gcc.bug
Article #1483Problems with pointer to pointer to void (type[Pparameter passing)
From: Ruud Cox
Date: Thu, 24 Dec 1992 21:09
Date: Thu, 24 Dec 1992 21:09
49 lines
2382 bytes
2382 bytes
Hai,
When we were porting our C libraries to GNU C, we encountered the following
problem:
GCC VERSION: GNU C 3.2.1
MACHINETYPE: Sun Sparc station IPX (sun4c)
OS VERSION: sunos 4.1.3
CONFIGURATION: sparc-sun-sunos4.3.1
CHANGES TO GCC: none
COMMANDLINE ARGUMENTS: gcc -c tgcc.c
When compiling undermentioned program GNU C produces the following Warning:
tgcc: In function 'main':
tgcc[A.c: In function 'main':[B[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D.c:10: warning: passing arg 1 of 'test_voidpp' from incompatible pointer type
To my knowledge this is wrong. A cast from pointer to pointer to int is
compatible with a pointer to a pointer to a void.
We could change void ** to void *, but then we can pass 'intp' without '&' to
the funtion without the compiler giving sn error.
----------------------------------------------------------------------------
[A[C[A[C[C[C[C[C[C[C[C[C[C[C[C[C[C[C[C[C[C[C[C[C[C[C[C[C[C[C[C[C[C[C[C[C[C[C[C[C[C[Ca[B[B[H[B[B[B[B[B[B[B[B[B[B[B[B[B[B[B[B[B[B[B[B[B[B[Btest_voidpp(void **pp)
{
}
main()
{
int *intp;
test_voidpp(&intp);
}
-----------------------------------------------------------------[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D
[A [B[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[D[Dtest_voidpp(void **pp)[B[H[B[B[B[B[B[B[B[B[B[B[B[B[B[B[B{
}
[B[D[D[D[D[D[Dmain()
{
[A[C[C[C[C [B[D[D[D[D[D[D[D[D[D[Dint *intp;
[B[H[B[B[B[B[B[B[B[B[B[B[B[B[B[B[B[B[B[B[B[B[B[B test_voidpp(&intp);
[C[C[C[C[C[C[C[C[C[C[C[C[C[C[C[A[C}
----------------------------------------------------------------------------
Ruud Cox
st. Leonardusstraat 10B[D B
5614 EH Eindhoven
Netherlands
e-mail: ruud@zuma.audacter.nl
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Path: arc1-ca.pugleaf.net!sparky!uunet!crdgw1!rpi!zaphod.mps.ohio-state.edu!cis.ohio-state.edu!zuma.AUdacter.NL!ruud From: ruud@zuma.AUdacter.NL (Ruud Cox) Newsgroups: gnu.gcc.bug Subject: Problems with pointer to pointer to void (type[Pparameter passing) Message-ID: <9212241609.AA36.V1.4@zuma.audacter.nl> Date: 24 Dec 92 21:09:03 GMT Sender: gnulists@ai.mit.edu Distribution: gnu Organization: GNUs Not Usenet Lines: 49 Approved: bug-gcc@prep.ai.mit.edu