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config.guess: combine two heuristics to detect musl libc
Apparently, this is needed to correctly detect musl libc in different
versions of Alpine Linux.
According to
https://lists.gnu.org/archive/html/config-patches/2020-09/msg00002.html,
the ldd based check does not work for some old versions of the Alpine Linux,
and, according to
https://lists.gnu.org/archive/html/config-patches/2020-11/msg00002.html,
the compiler may not be available in a fresh Alpine container.
The ldd based check is essentially the same as the check that was
introduced by commit 3d00f60242
, it is
performed iff the compiler based check could not give a definitive
answer.
Reported-by: Cheng XU <xucheng@me.com>
Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>
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