[bpt/emacs.git] / admin / notes / cpp

ttn 2003-04-09

we use a C preprocesor not only in the normal compilation of .c files
into object files, but also for creating

	src/Makefile
	lib-src/Makefile

(delimited by comment "start of cpp stuff").  some cpp implementations
insert whitespace in between tokens, which explains the "$(dot)$(dot)"
and "UNEXEC_ALIAS" workarounds for unixoid systems and the bundled
tradcpp/ for vms.  [NOTE: tradcpp/ not yet checked in.]

during makefile creation, the preprocessor symbol NOT_C_CODE is defined.
this should not be defined for normal .c file compilation.

there has been discussion on eliminating this use of cpp and relying
solely on autoconf processing.  rms says to leave it be.
Commit	Line	Data
564b85ec TTN	1	ttn 2003-04-09
	2
	3	we use a C preprocesor not only in the normal compilation of .c files
	4	into object files, but also for creating
	5
	6	src/Makefile
	7	lib-src/Makefile
	8
	9	(delimited by comment "start of cpp stuff"). some cpp implementations
	10	insert whitespace in between tokens, which explains the "$(dot)$(dot)"
	11	and "UNEXEC_ALIAS" workarounds for unixoid systems and the bundled
	12	tradcpp/ for vms. [NOTE: tradcpp/ not yet checked in.]
	13
	14	during makefile creation, the preprocessor symbol NOT_C_CODE is defined.
	15	this should not be defined for normal .c file compilation.
	16
	17	there has been discussion on eliminating this use of cpp and relying
	18	solely on autoconf processing. rms says to leave it be.