Bug#885845: netcdf FTCBFS: CHECK_C_SOURCE_RUNS

[Helmut Grohne]

Source: netcdf
Version: 1:4.5.0-1
Tags: patch upstream
User: helmutg at debian.org
Usertags: rebootstrap

netcdf fails to cross build from source, because it uses
CHECK_C_SOURCE_RUNS. Fortunately, the only relevant check can easily be
turned into CHECK_C_SOURCE_COMPILES (by exploiting that arrays of
negative length cause a compile error). After doing so, netcdf cross
builds successfully. Please consider applying the attached patch.

Helmut
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