[Debian-med-packaging] Bug#980484: gmap FTCBFS: AC_RUN_IFELSE

[Helmut Grohne]

Source: gmap
Version: 2020-12-17+ds-2
Tags: patch upstream
User: debian-cross at lists.debian.org
Usertags: ftcbfs

gmap fails to cross build from source, because it uses AC_RUN_IFELSE a
lot. I wa able to reduce the impact somewhat with the attached patch:
 * When checking for e.g. __builtin_popcount, still check that it works
   on native builds, but during cross builds assume that it works when
   the symbol is available.
 * The bsr assembler instruction test doesn't gain anything from running
   it. It can be demoted to a link test.
 * Checks involving #include <immintrin.h> can be skipped when the
   header is unavailable.

This still leaves a number of remaining AC_RUN_IFELSE and gmap will not
become cross buildable. Please consider applying my patch as an
incremental improvement nonetheless.

Helmut
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