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preprocessor/2790: Preprocessor has problems using ## to construct valid C code.
- To: gcc-gnats at gcc dot gnu dot org
- Subject: preprocessor/2790: Preprocessor has problems using ## to construct valid C code.
- From: tim dot vanholder at falconsoft dot be
- Date: Wed, 9 May 2001 14:30:26 +0200
>Number: 2790
>Category: preprocessor
>Synopsis: Preprocessor has problems using ## to construct valid C code.
>Confidential: no
>Severity: non-critical
>Priority: high
>Responsible: unassigned
>State: open
>Class: rejects-legal
>Submitter-Id: net
>Arrival-Date: Wed May 09 05:36:01 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator: Tim Van Holder
>Release: 3.0 20010430 (prerelease)
>Organization:
Falcon Software N.V.
>Environment:
System: Linux bender.falconsoft.be 2.2.16-3 #19 Thu Nov 30 11:39:13 CET 2000 i686 unknown
Architecture: i686
host: i686-pc-linux-gnu
build: i686-pc-linux-gnu
target: i686-pc-linux-gnu
configured with: ../gcc/configure --with-gcc-version-trigger=/home/tim/gnu/gcc/gcc/version.c --host=i686-pc-linux-gnu --with-version-specific-runtime-libs --prefix=/opt/gcc3
>Description:
gcc's preprocessor gives warnings for what I believe to be valid code.
>How-To-Repeat:
Try to compile the code below.
struct bar {
int a;
int b;
};
/* This simplifies the basic 'property get'-type functions */
#define TAKE_FUNCTION(foo) \
int take_##foo(struct bar* me) \
{ \
if (me == 0) \
return 0; \
return me->##foo; \
}
TAKE_FUNCTION(a)
TAKE_FUNCTION(b)
#undef TAKE_FUNCTION
You will get
warning: pasting "->" and "a" does not give a valid preprocessing token
warning: pasting "->" and "b" does not give a valid preprocessing token
The same happens if (*me).##foo is used.
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted: