?RCS: $Id: cpp_stuff.U 1 2006-08-24 12:32:52Z rmanfredi $
?RCS:
?RCS: Copyright (c) 1991-1997, 2004-2006, Raphael Manfredi
?RCS:
?RCS: You may redistribute only under the terms of the Artistic Licence,
?RCS: as specified in the README file that comes with the distribution.
?RCS: You may reuse parts of this distribution only within the terms of
?RCS: that same Artistic Licence; a copy of which may be found at the root
?RCS: of the source tree for dist 4.0.
?RCS:
?RCS: $Log: cpp_stuff.U,v $
?RCS: Revision 3.0.1.1  1994/10/29  16:08:24  ram
?RCS: patch36: now uses cppstdin instead of plain cpp for consistency (ADO)
?RCS: patch36: remove temporary files when done
?RCS:
?RCS: Revision 3.0  1993/08/18  12:05:36  ram
?RCS: Baseline for dist 3.0 netwide release.
?RCS:
?MAKE:cpp_stuff: cat contains cppstdin cppflags cppminus rm
?MAKE:	-pick add $@ %<
?S:cpp_stuff:
?S:	This variable contains an identification of the concatenation mechanism
?S:	used by the C preprocessor.
?S:.
?C:CAT2:
?C:	This macro concatenates 2 tokens together.
?C:.
?C:CAT3:
?C:	This macro concatenates 3 tokens together.
?C:.
?C:CAT4:
?C:	This macro concatenates 4 tokens together.
?C:.
?C:CAT5:
?C:	This macro concatenates 5 tokens together.
?C:.
?C:STRINGIFY:
?C:	This macro surrounds its token with double quotes.
?C:.
?C:SCAT2:
?C:	This macro concatenates 2 tokens together and stringifies the result.
?C:	It might not exist, so #ifdef it in your code!
?C:.
?C:SCAT3:
?C:	This macro concatenates 3 tokens together and stringifies the result.
?C:	It might not exist, so #ifdef it in your code!
?C:.
?C:SCAT4:
?C:	This macro concatenates 4 tokens together and stringifies the result.
?C:	It might not exist, so #ifdef it in your code!
?C:.
?C:SCAT5:
?C:	This macro concatenates 5 tokens together and stringifies the result.
?C:	It might not exist, so #ifdef it in your code!
?C:.
?X:	Dist pl70 included the following, but AIX's xlc compiler
?X:	(which is ANSI-ish and has cpp_stuff == 42)) rejects
?X:	The SQuoTe/EQuoTe stuff because the string literals are on
?X:	separate lines.  Sigh.
?X:		Andy Dougherty   24 Feb 1998
?X:	?H:?%<:#if $cpp_stuff == 1
?X:	?H:?CAT2:#define CAT2(a,b)a/**/b
?X:	?H:?CAT3:#define CAT3(a,b,c)a/**/b/**/c
?X:	?H:?CAT4:#define CAT4(a,b,c,d)a/**/b/**/c/**/d
?X:	?H:?CAT5:#define CAT5(a,b,c,d,e)a/**/b/**/c/**/d/**/e
?X:	?H:?STRINGIFY:#define STRINGIFY(a)"a"
?X:	?H:?%<:#define SQuoTe(a)"a
?X:	?H:?%<:#define EQuoTe(a)a"
?X:	?H:?SCAT2:#define SCAT2(a,b)EQuoTe(SQuoTe(a)b)
?X:	?H:?SCAT3:#define SCAT3(a,b,c)EQuoTe(SQuoTe(a)b/**/c)
?X:	?H:?SCAT4:#define SCAT4(a,b,c,d)EQuoTe(SQuoTe(a)b/**/c/**/d)
?X:	?H:?SCAT5:#define SCAT5(a,b,c,d,e)EQuoTe(SQuoTe(a)b/**/c/**/d/**/e)
?X:	?H:?%<:#endif
?H:?%<:#if $cpp_stuff == 1
?H:?CAT2:#define CAT2(a,b)	a/**/b
?H:?CAT3:#define CAT3(a,b,c)	a/**/b/**/c
?H:?CAT4:#define CAT4(a,b,c,d)	a/**/b/**/c/**/d
?H:?CAT5:#define CAT5(a,b,c,d,e)	a/**/b/**/c/**/d/**/e
?H:?STRINGIFY:#define STRINGIFY(a)	"a"
?X:	If you can get stringification with catify, tell me how!
?H:?%<:#endif
?H:?%<:#if $cpp_stuff == 42
?H:?%<:#define PeRl_CaTiFy(a, b)	a ## b
?H:?%<:#define PeRl_StGiFy(a)	#a
?X: The additional level of indirection enables these macros to be
?X: used as arguments to other macros.  See K&R 2nd ed., page 231.
?H:?CAT2:#define CAT2(a,b)	PeRl_CaTiFy(a,b)
?H:?CAT3:#define CAT3(a,b,c)	CAT2(PeRl_CaTiFy(a,b),c)
?H:?CAT4:#define CAT4(a,b,c,d)	CAT2(CAT3(a,b,c),d)
?H:?CAT5:#define CAT5(a,b,c,d,e)	CAT2(CAT4(a,b,c,d),e)
?H:?%<:#define StGiFy(a)	PeRl_StGiFy(a)
?H:?STRINGIFY:#define STRINGIFY(a)	PeRl_StGiFy(a)
?H:?SCAT2:#define SCAT2(a,b)	PeRl_StGiFy(a) PeRl_StGiFy(b)
?H:?SCAT3:#define SCAT3(a,b,c)	PeRl_StGiFy(a) PeRl_StGiFy(b) PeRl_StGiFy(c)
?H:?SCAT4:#define SCAT4(a,b,c,d)	PeRl_StGiFy(a) PeRl_StGiFy(b) PeRl_StGiFy(c) PeRl_StGiFy(d)
?H:?SCAT5:#define SCAT5(a,b,c,d,e)	PeRl_StGiFy(a) PeRl_StGiFy(b) PeRl_StGiFy(c) PeRl_StGiFy(d) PeRl_StGiFy(e)
?H:?%<:#endif
?H:?%<:#if $cpp_stuff != 1 && $cpp_stuff != 42
?H:?%<:#include "Bletch: How does this C preprocessor concatenate tokens?"
?H:?%<:#endif
?H:.
?W:%<:CAT2 CAT3 CAT4 CAT5 STRINGIFY SCAT2 SCAT3 SCAT4 SCAT5
?LINT:known StGiFy
?LINT:known PeRl_CaTiFy
?LINT:known PeRl_StGiFy
: how do we concatenate cpp tokens here?
echo " "
echo "Checking to see how your cpp does stuff like concatenate tokens..." >&4
$cat >cpp_stuff.c <<'EOCP'
#define RCAT(a,b)a/**/b
#define ACAT(a,b)a ## b
RCAT(Rei,ser)
ACAT(Cir,cus)
EOCP
$cppstdin $cppflags $cppminus <cpp_stuff.c >cpp_stuff.out 2>&1
if $contains 'Circus' cpp_stuff.out >/dev/null 2>&1; then
	echo "Oh!  Smells like ANSI's been here." >&4
	echo "We can catify or stringify, separately or together!"
	cpp_stuff=42
elif $contains 'Reiser' cpp_stuff.out >/dev/null 2>&1; then
	echo "Ah, yes!  The good old days!" >&4
	echo "However, in the good old days we don't know how to stringify and"
	echo "catify at the same time."
	cpp_stuff=1
else
	$cat >&4 <<EOM
Hmm, I don't seem to be able to concatenate tokens with your cpp.
You're going to have to edit the values of CAT[2-5] in config.h...
EOM
?X: It would be nice to have configure remind us at the end that some manual
?X: intervention is needed -- FIXME
	cpp_stuff="/* Help! How do we handle cpp_stuff? */*/"
fi
$rm -f cpp_stuff.*