[Mono-dev] Question about issue building basic.exe and mscorlib paths

Alex J Lennon ajlennon at dynamicdevices.co.uk
Wed Mar 5 09:54:48 UTC 2014

On 02/03/2014 13:54, Zoltan Varga wrote:
> Hi,
>   mono requires an existing mono installation to work, and will only
> fall back to monolite if it is missing. If you want it to use
> monolite, then remove the existing mono installation from the PATH.
>                     Zoltan

Hi Zoltan,

Thanks for the response.

I'm not sure I understand you. There is already a monolite/basic.exe
present in the Mono archive.

The build environment is building another basic.exe

The problem seems to be that a dependency is being introduced on the
wrong mscorlib by the basic
profile makefile, which is what I was attempting to address (?)

Best Regards,


> On Sun, Mar 2, 2014 at 8:24 AM, Alex J Lennon
> <ajlennon at dynamicdevices.co.uk <mailto:ajlennon at dynamicdevices.co.uk>>
> wrote:
>     Hi,
>     I'm updating a recipe for Yocto/Openembedded layer, meta-mono, which
>     cross-compiles Mono 3.2.8 for embedded Linux targets.
>     I am using an Ubuntu 12.04 LTS host for build and previously this has
>     worked well with the default mono support available in precise,
>     version
>     2.10 I think.
>     (NB the Yocto  build environment shouldn't have any external
>     dependencies on the  host version of mono as it is building its own
>     native, host, build  prior to the cross-compiled build).
>     When I updated the host to use Mono  3.2.1 from ppa:directhex/monoxide
>     for some other work I was doing, I started getting unexpected build
>     problems with the meta-mono recipe.
>     >From what I've been able to track down, what is happening is that the
>     build process is building basic/basic.exe from the basic profile. I'm
>     not sure why this is happening as we already have the bootstrap
>     basic.exe in monolite.
>     This new basic.exe should have a dependency on the apropriate
>     mscorlib.dl that is being built with it, but instead has a
>     dependency on
>     an external mscorlib.dll on the host. With Mono 3.2.1 installed this
>     dependency is on /usr/lib/mono/4.5/mscorlib.dll
>     As a result of this dependency when the new basic.exe is executed
>     we get
>     various warnings of the form,
>     ../corlib/Mono/DataConverter.cs(759,25): warning CS0436: The type
>     `Mono.DataConverter' conflicts with the imported type of same name'.
>     Ignoring the imported type definition
>     ../../build/common/MonoTODOAttribute.cs(38,17): (Location of the
>     symbol
>     related to previous warning)
>     /usr/lib/mono/4.5/mscorlib.dll (Location of the symbol related to
>     previous warning)
>     Then an error
>     MCS     [build] mscorlib.dll
>     Unhandled Exception:
>     System.TypeLoadException: Could not load type
>     'Mono.CSharp.CommandLineParser' from assembly 'basic, Version=,
>     Culture=neutral, PublicKeyToken=null'.
>     [ERROR] FATAL UNHANDLED EXCEPTION: System.TypeLoadException: Could not
>     load type 'Mono.CSharp.CommandLineParser' from assembly 'basic,
>     Version=, Culture=neutral, PublicKeyToken=null'.
>     make[8]: *** [../../class/lib/build/tmp/mscorlib.dll] Error 1
>     I took a look at the basic profile make file for missing paths and I
>     think it may be missing the required dependency path. When I added
>     this
>     in the build works,
>     --- 3.2.8-r0/mcs/build/profiles/basic.make.org
>     <http://basic.make.org>  2014-03-01
>     17:51:52.904670729 +0000
>     +++ 3.2.8-r0/mcs/build/profiles/basic.make      2014-03-01
>     17:46:50.476669939 +0000
>     @@ -12,7 +12,7 @@
>      PROFILE_RUNTIME = $(with_mono_path_monolite) $(RUNTIME)
>     $(MONOLITE_MCS) -sdk:2
>      else
>     +PROFILE_RUNTIME = ${with_mono_path) $(EXTERNAL_RUNTIME)
>      endif
>     Could somebody please comment on whether this makes sense? If so
>     I'd be
>     happy to provide the patch to you in whatever format is required.
>     Thanks & Best Regards,
>     Alex Lennon
>     Dynamic Devices Ltd
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Dynamic Devices Ltd <http://www.dynamicdevices.co.uk/>

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