Re: c++/4241: C++ old cast parsing bug

Re: c++/4241: C++ old cast parsing bug

[aoliva]

Synopsis: C++ old cast parsing bug

State-Changed-From-To: open->closed
State-Changed-By: aoliva
State-Changed-When: Sun Sep  9 14:22:19 2001
State-Changed-Why:
    Yup, this is the parser bug documented in the known bugs web page.  GCC attempts to parse (long (int (bh)) as if it were a prefix of a type-cast such as (long (*)(int bh)), but the attempt fails when it doesn't encounter the third closing parenthesis that would be needed for such a parse to be correct, and then it can't recover to try an alternative parsing.  The new C++ parser being written is going to solve this problem.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view&pr=4241&database=gcc

c++/4241: C++ old cast parsing bug

[Zoltan Hidvegi]

>Number:         4241
>Category:       c++
>Synopsis:       C++ old cast parsing bug
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          rejects-legal
>Submitter-Id:   net
>Arrival-Date:   Wed Sep 05 14:56:00 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     Zoltan Hidvegi
>Release:        3.0.1 20010725 (prerelease)
>Organization:
>Environment:
System: AIX vlad 3 4 0005BA2F4C00


	
host: powerpc-ibm-aix4.3.3.0
build: powerpc-ibm-aix4.3.3.0
target: powerpc-ibm-aix4.3.3.0
configured with: ../gcc/configure --prefix=... --with-local-prefix=... --enable-languages=c,c++,java --enable-version-specific-runtime-libs --disable-nls --disable-shared
>Description:
G++ gives parse error on (long(int(bh)) + 3 < 3):

int
foo(long bh)
{
    return (long(int(bh)) + 3 < 3);
}

>How-To-Repeat:
Compile this as a C++ program:

int
foo(long bh)
{
    return (long(int(bh)) + 3 < 3);
}
>Fix:
Workaround: use ((long)int(bh) + 3 < 3)
>Release-Note:
>Audit-Trail:
>Unformatted: