fail with perl-5.22.0 and static build

[fperrad]

see patch/discussion on Buildroot https://patchwork.ozlabs.org/patch/517172/

[fperrad]

the patch which fixes the issue in Buildroot, is not needed when building a native Perl (without perl-cross)

$ ./Configure -des -Uusedl
$ make

So, may be, the issue could be fixed in perl-cross instead of in perl.

[fperrad]

the patch is enough with a Buildroot external toolchain, but not with http://autobuild.buildroot.org/toolchains/tarballs/br-arm-full-static-2015.08-rc1-38-gad0f85e.tar.bz2

see http://autobuild.buildroot.net/results/f1b/f1b887781655c47e8a637a2df2a8029ef439083a/

[arsv]

Ok, here's what fixes that vpp.pm issue:
f53a9f1

The original perl makefiles let miniperl use any module under lib/, so it successfully picks up the right version.pm. In perl-cross without that fix, version.pm is not available, so at lib/ExtUtils/MakeMaker/version.pm:24 they attempt to substitute some kind of fall-back stub for version.pm. Which happens to be more demanding that the actual version.pm.

Missing Bessel functions are almost for sure unrelated to this. I can't see them in libm.a from that toolchain, but it looks like configure detects them as available.

[arsv]

And libm.a link tests fixed as well:
ce7fa56

[fperrad]

sounds good.