[patch #7788] macro AX_LIB_HDF5 breaks for cross-compile configure-ations

[Rhys Ulerich]

Follow-up Comment #3, patch #7788 (project autoconf-archive):

Hmm...  There's no "detecting" in this macro in the usual autoconf sense-- it
merely looks for the installed h5cc/h5pcc/etc compiler wrappers and scrapes
their output.  I could see adding some linking tests at the end of
ax_lib_hdf5.m4 to verify that the libraries link correctly on the target (and
therefore detect the problem you report), but I'm unsure how to extend the
current scraping approach to do what you want (which I agree is the right
thing).

I'll admit I'm not familiar with using HDF5 wrappers for cross-compilation. Do
you have an h5cc compiler wrapper somewhere which works for your cross-compile
when invoked manually?

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