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* xargs/xargs.c (warn_mutually_exclusive): Add function to output the new warning diagnostic. (main): Call the above new function in order to show a warning message if conflicting options (-L -l -I -i -n) are specified. * xargs/xargs.1: Explicitly document the fact that -L -l -I -i -n options are mutually exclusive and how xargs behaves when more than one of these options are specified. * doc/find.texi (node Conflicting xargs options): Likewise, add this section with examples. * xargs/testsuite/config/unix.exp (xargs_start): Replace the full path of the xargs executable in the stderr output file by its basename. * xargs/testsuite/xargs.gnu/P3-n1-IARG.xe: Add file containing the expected output with the new warning diagnostic. * xargs/testsuite/xargs.posix/L2-n2.xe: Likewise. * xargs/testsuite/xargs.posix/rc-123.xe: Likewise. * xargs/testsuite/xargs.sysv/l1n4.xe: Likewise. * xargs/testsuite/xargs/testsuite/xargs.gnu/P3-n1-IARG.exp: Ensure the error diagnostic is in C locale to avoid false positives in other locales. * xargs/testsuite/xargs.posix/L2-n2.exp: Likewise. * xargs/testsuite/xargs.posix/rc-123.exp: Likewise. * xargs/testsuite/xargs.sysv/l1n4.exp: Likewise. * tests/xargs/conflicting_opts.sh: Add test coverage for combinations of the mutually exclusive options -I -L and -n. * xargs/testsuite/Makefile.am (EXTRA_DIST_EXP): Reference the new tests. (EXTRA_DIST_XO): Reference the new *.xo files. (EXTRA_DIST_XE): Reference the new *.xe files. * NEWS (Improvements): Mention the change. Co-authored-by: Bernhard Voelker <mail@bernhard-voelker.de> Discussed at https://savannah.gnu.org/bugs/?52137 Duplicate of https://savannah.gnu.org/bugs/?58156