Bug 65550

Summary:	gcc 2.96-110 does not perform implicit cast
Product:	[Retired] Red Hat Linux	Reporter:	Peter Klotz <peter.klotz99>
Component:	gcc	Assignee:	Jakub Jelinek <jakub>
Status:	CLOSED WORKSFORME	QA Contact:	Brian Brock <bbrock>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	7.3
Target Milestone:	---
Target Release:	---
Hardware:	i386
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2002-05-27 18:12:15 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Peter Klotz 2002-05-27 14:30:23 UTC

From Bugzilla Helper:
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Description of problem:
gcc 2.96-110 refuses to perform the implicit cast from void* to int* in C mode.
gcc 2.96-98, gcc 3.1, gcc 2.95.3, MSVC 6 and Comeau 4.3 compile the code. 
gcc 2.96-98 compiles the ORB MICO (www.mico.org), gcc 2.96-110 does not because
a code fragment similar to this one shows up in C code generated by Bison.


Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1.gcc cast.c
2.
3.
	

Actual Results:  cast.c: In function `int main ()':
cast.c:6: cannot convert `void *' to `int *' for argument `1' to `f
(int *)'


Expected Results:  Should compile.

Additional info:

void f(int* i) {}

int main(void)
{
    void* v=0;
    f(v);
    return 0;
}

Comment 1 Jakub Jelinek 2002-05-27 17:08:01 UTC

Works for me just fine:
gcc -W -Wall n.c
n.c: In function `f':
n.c:1: warning: unused parameter `i'
gcc -v
Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/2.96/specs
gcc version 2.96 20000731 (Red Hat Linux 7.2 2.96-110)

My guess is you used the g++ driver, in that case you really get that error:

g++ -W -Wall n.c
n.c: In function `void f (int *)':
n.c:1: warning: unused parameter `int *i'
n.c: In function `int main ()':
n.c:6: cannot convert `void *' to `int *' for argument `1' to `f (int *)'

but that's correct, C++ doesn't allow this and running g++ on a .c file
compiles it as C++.

You get similar error from gcc 3.1:

g++3 -W -Wall n.c
n.c: In function `void f(int*)':
n.c:1: warning: unused parameter `int*i'
n.c: In function `int main()':
n.c:6: invalid conversion from `void*' to `int*'
g++3 -v
Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/3.1/specs
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --enable-shared --enable-threads=posix --disable-checking --host=i386-redhat-linux --with-system-zlib
Thread model: posix
gcc version 3.1 20020525 (Red Hat Linux 7.3 3.1-3)

Comment 2 Peter Klotz 2002-05-27 18:12:10 UTC

You are absolutely right. For some reason /usr/bin/gcc was a softlink to
/usr/bin/g++. After restoring gcc via rpm it worked.

Sorry for the false bug report.