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macOS libiconv lists some names (e.g. WINDOWS-874) under more than one charset group. Treat the first binding as authoritative so module_iconv initialization no longer fails during the check phase on Darwin.
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On macOS,
iconv -llists some charset aliases under more than one group. In particular,WINDOWS-874appears with bothCP1162andCP874. Whentables.pyturns that listing intoiconvdecl.h,module_iconvthen tries to declare the same alias for two different charsets and aborts initialization with a contradiction error. That makes the check phase fail on aarch64-darwin (and likely x86_64-darwin as well).This change:
tables.py, when digestingiconv -l, keep only the first occurrence of each alias name.module_iconv, if an alias is already bound to a different charset, keep the existing binding instead of failing.Verified on aarch64-darwin with recode 3.7.16: 488 good tests.