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Re: [Xen-devel] fatal error if Flex and Bison is not configured

On Thu, 2012-04-12 at 12:12 +0100, zhihao wang wrote:
> Hi all,
> I try to build xen 4.2( revision number: 25161) on Ubuntu 11.10_amd64,
> Mac pro. After running ./configure and make. I got the following fatal
> error:
> libxlu_cfg_y.y:22:26: fatal error: libxlu_cfg_l.h: No such file or
> directory compilation terminated.
> So the original libxlu_cfg_l.h is deleted when making, and should be
> regenerated but it is not.

Actually it should never have been deleted in the first place, unless
you have been modifying the flex source.

Please can you enumerate the exact steps you took, starting from the
initial clone of the repo, which caused the file to be deleted?

> I find the path of flex and bison is not set.  When I add the correct
> path of flex and bison in tools.mk manually, This error is fixed. 

Those tools should be optional since the generated files are checked in.
However perhaps configure should detect and provide the paths but behave
in a non-fatal manner if they aren't available? Roger, what do you


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