Re: [HACKERS] Bogosity in contrib/xml2/Makefile

Tom, did we come to any conclusion on this?

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Tom Lane wrote:
> Whilst fooling with bug #4058 I noticed that xml2's .c files were being
> compiled without -g or any of the various warning flags we normally use.
> I saw this:
>
> gcc -I/usr/include/libxml2 -fpic -I. -I../../src/include -D_GNU_SOURCE -I/usr/include/libxml2 -c -o xpath.o xpath.c
>
> when I expected something like this:
>
> gcc -O2 -Wall -Wmissing-prototypes -Wpointer-arith -Winline -Wdeclaration-after-statement -Wendif-labels -fno-strict-aliasing -fwrapv -g -fpic -I. -I../../src/include -D_GNU_SOURCE -I/usr/include/libxml2 -c -o xpath.o xpath.c
>
> The reason is apparently this line in its Makefile:
>
> override CFLAGS += $(shell xml2-config --cflags)
>
> It seems the "override" locks down the value so that the subsequent
> assignment in Makefile.global does nothing. I didn't try the PGXS
> case but I imagine it doesn't do the right thing either.
>
> Now, in HEAD and 8.3 I think we could just remove this line, because
> configure knows how to pull the needed -I and -L flags out of
> xml2-config's output and stick them into appropriate flag variables
> (neither of which is CFLAGS btw...). I am not sure what to do in older
> branches though --- there doesn't seem to be any real nice solution.
>
> Even though xml2 is deprecated and may go away for 8.4, I think this is
> important to fix in the back branches. Failing to use the -f flags for
> instance could be resulting in outright wrong code, and we'd be unlikely
> to notice since there's no regression test at all for this module.
>
> Thoughts?
>
> regards, tom lane
>
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