Date: Wed, 06 Aug 2003 01:03:58 +0300 From: Diomidis Spinellis <dds@aueb.gr> To: Dag-Erling =?iso-8859-7?Q?Sm=F8rgrav?= <des@des.no> Cc: Johan Karlsson <johan@FreeBSD.org> Subject: Re: cvs commit: src/sys/dev/sym sym_fw.h Message-ID: <3F3029CE.40C6746B@aueb.gr> References: <200308050722.h757MCxl098780@repoman.freebsd.org> <20030805122815.GA17099@numeri.campus.luth.se> <3F2FAE21.6EEB6309@aueb.gr> <xzp8yq7ao2r.fsf@dwp.des.no>
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Dag-Erling Sm=F8rgrav wrote:
> Diomidis Spinellis <dds@aueb.gr> writes:
> > SYM_GEN_B is defined as
> >
> > #define SYM_GEN_B(s, label) s label;
> >
> > in the include file for defining the structure members, and as
> >
> > #define SYM_GEN_B(s, label) ((short) offsetof(s, label)),
> >
> > in the C file for initializing the structures. Thus SYM_GEN_FW will
> > always end with a semicolon or a comma.
> =
> Remove the semicolon and the comma from the definitions, and add
> semicolons and commas to the invocations.
As I wrote, this will not work, because there we are dealing with two
different nested macro definitions. Consider the main macro definition
D1 and the two alternative nested macros D2 and D3:
// D1: =
#define SYM_GEN_FW_B(s) \
SYM_GEN_B(s, no_data) \
SYM_GEN_B(s, sel_for_abort) \
SYM_GEN_B(s, sel_for_abort_1) \
=2E..
// D2:
#define SYM_GEN_B(s, label) s label;
// D3:
#define SYM_GEN_B(s, label) ((short) offsetof(s, label)),
Removing the semicolon from D2 or the comma from D3 will make D1
syntactically incorrect.
Diomidis -- dds@
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