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MFC r306729: makeman: avoid bogus output with duplicated options

Description

MFC r306729: makeman: avoid bogus output with duplicated options

On some targets 'make showconfig' currently reports both 'no' and 'yes'
for some options. For example:

% make TARGET=mips showconfig | grep SSP
MK_SSP = no
MK_SSP = yes

Emit a warning on encountering a duplicated variable, and skip the
second entry.

PR: 226908, 229514
Sponsored by: The FreeBSD Foundation

Details

Provenance
emasteAuthored on
Parents
rS339280: Update Armada 38x UART device tree binding
Branches
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