Crosscompiling Mono 5.0.0.100

Hello developers,

I'm trying to crosscompile mono for qemu versatile with the buildroot
crosscompiling system. More precisely, I'm trying to update the recipe
bundled with buildroot for mono 4.8.1.100.
I'm actually not a novice in this sort of thing, I actually
contributed the recipe in the first place and contributed several
patches to the mono build system to be cross compilable and musl
compatible.

Actually I have a working recipe, the same one i use for 4.8.1.100 and
which works, and I can successfully compile mono 5.0.0.100.

Unfortunately, compiling a simple hello world produces this error:

# mcs hello.cs
Stacktrace:

  at <unknown> <0xffffffff>
  at Mono.SafeStringMarshal.get_Value () [0x0001a] in
<a1ccf43d50c94435a9f0fcab25017dca>:0
  at System.Environment.internalGetEnvironmentVariable (string)
[0x0000c] in <a1ccf43d50c94435a9f0fcab25017dca>:0
  at System.Environment.GetEnvironmentVariable (string) [0x00000] in
<a1ccf43d50c94435a9f0fcab25017dca>:0
  at Mono.CSharp.Driver.Main (string[]) [0x00000] in
<65e20f41151e464c8d313246de15d1a3>:0
  at (wrapper runtime-invoke) <Module>.runtime_invoke_int_object
(object,intptr,intptr,intptr) [0x00054] in
<65e20f41151e464c8d313246de15d1a3>:0
/proc/self/maps:
00008000-00299000 r-xp 00000000 08:00 3367       /usr/bin/mono-sgen
002a0000-002a2000 rwxp 00290000 08:00 3367       /usr/bin/mono-sgen
002a2000-0033b000 rwxp 00000000 00:00 0          [heap]
b4c91000-b4f09000 r-xp 00000000 08:00 3263
/usr/lib/mono/gac/System/4.0.0.0__b77a5c561934e089/System.dll
b4f09000-b5000000 r-xp 00000000 08:00 2599
/usr/lib/mono/gac/System.Core/4.0.0.0__b77a5c561934e089/System.Core.dll
b5000000-b5021000 rwxp 00000000 00:00 0
b5021000-b5100000 ---p 00000000 00:00 0
b51a9000-b51aa000 ---p 00000000 00:00 0
b51aa000-b52a9000 rwxp 00000000 00:00 0
b52a9000-b5652000 r-xp 00000000 08:00 1491       /usr/lib/mono/4.5/mscorlib.dll
b5652000-b5800000 r-xp 00000000 08:00 1270       /usr/lib/mono/4.5/mcs.exe
b5800000-b6000000 rwxp 00000000 00:00 0
b6000000-b6001000 ---p 00000000 00:00 0
b6001000-b6c00000 rwxp 00000000 00:00 0
b6c70000-b6cf0000 rwxp 00000000 00:00 0
b6cf2000-b6d0b000 rwxp 00000000 00:00 0
b6d0b000-b6d3a000 ---p 00000000 00:00 0
b6d3a000-b6d4a000 rwxp 00000000 00:00 0
b6d4a000-b6e7d000 r-xp 00000000 08:00 3567       /lib/libc-2.18.so
b6e7d000-b6e84000 ---p 00133000 08:00 3567       /lib/libc-2.18.so
b6e84000-b6e86000 r-xp 00132000 08:00 3567       /lib/libc-2.18.so
b6e86000-b6e87000 rwxp 00134000 08:00 3567       /lib/libc-2.18.so
b6e87000-b6e8a000 rwxp 00000000 00:00 0
b6e8a000-b6eab000 r-xp 00000000 08:00 543        /lib/libgcc_s.so.1
b6eab000-b6eb2000 ---p 00021000 08:00 543        /lib/libgcc_s.so.1
b6eb2000-b6eb3000 rwxp 00020000 08:00 543        /lib/libgcc_s.so.1
b6eb3000-b6ec9000 r-xp 00000000 08:00 991        /lib/libpthread-2.18.so
b6ec9000-b6ed0000 ---p 00016000 08:00 991        /lib/libpthread-2.18.so
b6ed0000-b6ed1000 r-xp 00015000 08:00 991        /lib/libpthread-2.18.so
b6ed1000-b6ed2000 rwxp 00016000 08:00 991        /lib/libpthread-2.18.so
b6ed2000-b6ed4000 rwxp 00000000 00:00 0
b6ed4000-b6ed8000 r-xp 00000000 08:00 209        /lib/libdl-2.18.so
b6ed8000-b6edf000 ---p 00004000 08:00 209        /lib/libdl-2.18.so
b6edf000-b6ee0000 r-xp 00003000 08:00 209        /lib/libdl-2.18.so
b6ee0000-b6ee1000 rwxp 00004000 08:00 209        /lib/libdl-2.18.so
b6ee1000-b6ee7000 r-xp 00000000 08:00 1327       /lib/librt-2.18.so
b6ee7000-b6eee000 ---p 00006000 08:00 1327       /lib/librt-2.18.so
b6eee000-b6eef000 r-xp 00005000 08:00 1327       /lib/librt-2.18.so
b6eef000-b6ef0000 rwxp 00006000 08:00 1327       /lib/librt-2.18.so
b6ef0000-b6f8d000 r-xp 00000000 08:00 207        /lib/libm-2.18.so
b6f8d000-b6f95000 ---p 0009d000 08:00 207        /lib/libm-2.18.so
b6f95000-b6f96000 r-xp 0009d000 08:00 207        /lib/libm-2.18.so
b6f96000-b6f97000 rwxp 0009e000 08:00 207        /lib/libm-2.18.so
b6f97000-b6fb7000 r-xp 00000000 08:00 2447       /lib/ld-2.18.so
b6fb7000-b6fb8000 rwxp 00000000 00:00 0
b6fb8000-b6fb9000 rwxs 00000000 00:0c 225        /dev/shm/mono.110
b6fb9000-b6fba000 ---p 00000000 00:00 0
b6fba000-b6fbb000 r-xp 00000000 00:00 0
b6fbb000-b6fbe000 rwxp 00000000 00:00 0
b6fbe000-b6fbf000 r-xp 0001f000 08:00 2447       /lib/ld-2.18.so
b6fbf000-b6fc0000 rwxp 00020000 08:00 2447       /lib/ld-2.18.so
bec63000-bec84000 rw-p 00000000 00:00 0          [stack]
bee69000-bee6a000 r-xp 00000000 00:00 0          [sigpage]
ffff0000-ffff1000 r-xp 00000000 00:00 0          [vectors]

Native stacktrace:


Debug info from gdb:

mono_gdb_render_native_backtraces not supported on this platform,
unable to find gdb or lldb

=================================================================
Got a SIGILL while executing native code. This usually indicates
a fatal error in the mono runtime or one of the native libraries
used by your application.
=================================================================

Aborted


I've not followed too closely the latests development bits for mono 5
and I'm asking you some advice to understand what's going on.

Thank your for your time!

-- 
Profile: http://it.linkedin.com/in/compagnucciangelo
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