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Re: Changes to gcc 3.x to invoke an external cpp (updated patch 2)


On Mon, 24 Dec 2001, Ashif S. Harji wrote:

> For the past 10 years, we have
> been developing concurrency software (uC++) that piggy-backs on g++. This
> software uses an additional preprocessor to change the source text *after*
> being processed by cpp. For the past 10 years, we have used the -B flag to
> supply our own cpp driver that first invokes the standard cpp and then our cpp.

> However, with the integrated cpp, we can no longer use this
> mechanism as our user-supplied cpp in the -B directory is no longer invoked
> unless the -save-temps flag is used, which produces unnecessary files so this
> is not a clean solution.

Seems to me that this would be most cleanly done in your Makefiles without
relying on gcc internals.  Pick a new filename extension (e.g. ".x"), then:

.x.o:
        $(CC) -E $< -o tmp1
	my-preprocess tmp1 >tmp2.i
	$(CC) tmp2.i -o $@
	rm tmp1 tmp2.i


Bernd


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