Hi Everyone, According to the Autoconf manual, commands like 'chmod +x' should be avoided in favor of 'chmod a+x'. I believe the same applies to 'chmod -w' and friends. Also see https://www.gnu.org/software/autoconf/manual/autoconf-2.69/html_node/Limitations-of-Usual-Tools.html.
It looks like there are some of the earlier in the gnulib sources: $grep -IR 'chmod +' ./* ./gnulib/tests/test-set-mode-acl.sh: /bin/chmod +a "user:daemon allow execute" tmpfile0 ./gnulib/tests/test-copy-file.sh: /bin/chmod +a "user:daemon allow execute" tmpfile0 ./gnulib/tests/test-copy-file.sh: /bin/chmod +a "group:daemon allow read" tmpfile0 ./gnulib/tests/test-copy-acl.sh: /bin/chmod +a "user:daemon allow execute" tmpfile0 ./gnulib/tests/test-copy-acl.sh: /bin/chmod +a "group:daemon allow read" tmpfile0 ./gnulib/tests/test-file-has-acl.sh: /bin/chmod +a "user:daemon allow execute" tmpfile0 ./gnulib/m4/progtest.m4:chmod +x conf$$.file ./gnulib_test/gltests/test-set-mode-acl.sh: /bin/chmod +a "user:daemon allow execute" tmpfile0 ./gnulib_test/gltests/test-copy-file.sh: /bin/chmod +a "user:daemon allow execute" tmpfile0 ./gnulib_test/gltests/test-copy-file.sh: /bin/chmod +a "group:daemon allow read" tmpfile0 ./gnulib_test/gltests/test-copy-acl.sh: /bin/chmod +a "user:daemon allow execute" tmpfile0 ./gnulib_test/gltests/test-copy-acl.sh: /bin/chmod +a "group:daemon allow read" tmpfile0 ./gnulib_test/gltests/test-file-has-acl.sh: /bin/chmod +a "user:daemon allow execute" tmpfile0 ./gnulib_test/configure: chmod +x "$as_me.lineno" || ./gnulib_test/configure:test $as_write_fail = 0 && chmod +x $CONFIG_STATUS || ac_write_fail=1
