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* Makefile.in (toplev.o): Depend on diagnostic-color.h. * diagnostic-color.c (should_colorize): Remove _WIN32 version. (colorize_init): Add argument to _WIN32 version. * toplev.c: Include diagnostic-color.h. (process_options): Default to -fdiagnostics-color=auto if GCC_COLORS env var is in the environment. * common.opt (fdiagnostics-color=): Add Var and Init. * doc/invoke.texi (-fdiagnostics-color=): Document that if GCC_COLORS env var is in the environment, the default is auto rather than never. * lib/prune.exp: Add -fdiagnostics-color=never to TEST_ALWAYS_FLAGS. * lib/c-compat.exp (compat-use-alt-compiler, compat_setup_dfp): Handle -fdiagnostics-color=never option similarly to -fno-diagnostics-show-caret option. From-SVN: r198332
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