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authorShiz <hi@shiz.me>2015-05-28 05:52:22 +0200
committerRich Felker <dalias@aerifal.cx>2015-05-28 00:08:13 -0400
commitfc431d3f76bb9bde34a89e4a3e4d0c27de959855 (patch)
treeffffc8d5e72e6283515ecf32cdf3e8bcbd7f39c8 /include/sys
parentaeeac9ca5490d7d90fe061ab72da446c01ddf746 (diff)
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configure: work around compilers that merely warn for unknown options
some compilers (such as clang) accept unknown options without error,
but then print warnings on each invocation, cluttering the build
output and burying meaningful warnings. this patch makes configure's
tryflag and tryldflag functions use additional options to turn the
unknown-option warnings into errors, if available, but only at check
time. these options are not output in config.mak to avoid the risk of
spurious build breakage; if they work, they will have already done
their job at configure time.
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