Re: [MirageOS-devel] github xen git mirror

[Anil Madhavapeddy <anil@xxxxxxxxxx>]

On 30 Jul 2015, at 16:13, Luke Dunstan <lukedunstan81@xxxxxxxxx> wrote:

On the normal Trusty cubieboard2 image I can install minios-xen fine, but on Vivid I get an error:

$ opam install minios-xen

[ERROR] The compilation of minios-xen failed at "make debug=n".

...

 ### stderr ###

# dtc/libfdt/fdt_ro.c:453:6: error: ânodedepthâ may be used uninitialized in this function [-Werror=maybe-uninitialized]

# [...]

# /home/mirage/.opam/4.02.1/build/minios-xen.0.7/include/libfdt.h: In function âfdt_parent_offsetâ:

# dtc/libfdt/fdt_ro.c:468:9: error: ânodedepthâ may be used uninitialized in this function [-Werror=maybe-uninitialized]

#   return fdt_supernode_atdepth_offset(fdt, nodeoffset,

#          ^

# dtc/libfdt/fdt_ro.c:453:6: note: ânodedepthâ was declared here

#   int nodedepth;

#       ^

# cc1: all warnings being treated as errors

# make: *** [/home/mirage/.opam/4.02.1/build/minios-xen.0.7/dtc/libfdt/fdt_ro.o] Error 1

mirage-xen-minios.0.7.0 was OK because of:

https://github.com/talex5/xen/commit/804d40b4fe00d68e1be3160f8bcc0d94f3d4edf0

I'm guessing that the difference in this image is that it has GCC-4.9.2 instead of 4.8.x, but I'm not certain.

Could we turn off -Werror for the OPAM builds, Thomas?  It's only really useful on Travis or other CI builds to spot regressions, but quite a blocker when using a varied build toolchain.

-anil

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