bug or feature

Matthew Dillon dillon at apollo.backplane.com
Wed Jan 5 21:24:26 PST 2005

:Hi all,
:we have an interesting function in make, which I finally can easily
:reproduce. Go to src/bin/expr/Makefile and change the expr.y to expr.c.
:Compile and wonder. This is the reason why the parallel gcc 3.4 build
:failed earlier and as far as I know this is not documented.

    There's nothing wrong with make.  The make clean target is not removing
    the temporary expr.c file generated by previous runs of make before you
    changed expr.y to expr.c, and it is that expr.c that it is finding.

    If you do that you will see that the standard conversion rules will
    cause yacc to be run to generate the .c file from the .y file.  That's
    documented conversion rule behavior for make.

    So the bug is simply that the Makefile is missing a CLEANFILES= expr.c
    line (or one of the .mk files is).

					Matthew Dillon 
					<dillon at xxxxxxxxxxxxx>

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