done; \
done | sort)
-xdefs = $(srcdir)/defs $(srcdir)/defs-static.in
+xdefs = $(srcdir)/t/ax/test-init.sh $(srcdir)/defs $(srcdir)/defs-static.in
ams := $(shell find $(srcdir) -name '*.dir' -prune -o -name '*.am' -print)
$(sc_obsolete_requirements_rules) \
sc_tests_obsolete_variables \
sc_tests_here_document_format \
+sc_tests_command_subst \
sc_tests_Exit_not_exit \
sc_tests_automake_fails \
sc_tests_required_after_defs \
sc_tests_overriding_macros_on_cmdline \
sc_tests_plain_sleep \
+sc_tests_ls_t \
sc_m4_am_plain_egrep_fgrep \
sc_tests_no_configure_in \
sc_tests_PATH_SEPARATOR \
exit 1; \
fi
+## Our test case should use the $(...) POSIX form for command substitution,
+## rather than the older `...` form.
+## The point of ignoring text on here-documents is that we want to exempt
+## Makefile.am rules, configure.ac code and helper shell script created and
+## used by out shell scripts, because Autoconf (as of version 2.69) does not
+## yet ensure that $CONFIG_SHELL will be set to a proper POSIX shell.
+sc_tests_command_subst:
+ @found=false; \
+ scan () { \
+ sed -n -e '/^#/d' \
+ -e '/<<.*END/,/^END/b' -e '/<<.*EOF/,/^EOF/b' \
+ -e 's/\\`/\\{backtick}/' \
+ -e "s/[^\\]'\([^']*\`[^']*\)*'/'{quoted-text}'/g" \
+ -e '/`/p' $$*; \
+ }; \
+ for file in $(xtests); do \
+ res=`scan $$file`; \
+ if test -n "$$res"; then \
+ echo "$$file:$$res"; \
+ found=true; \
+ fi; \
+ done; \
+ if $$found; then \
+ echo 'Use $$(...), not `...`, for command substitutions.' >&2; \
+ exit 1; \
+ fi
+
## Tests should never call exit directly, but use Exit.
## This is so that the exit status is transported correctly across the 0 trap.
## Ignore comments and our testsuite's own self tests.
exit 1; \
fi
+## Prefer use of our 'is_newest' auxiliary script over the more hacky
+## idiom "test $(ls -1t new old | sed 1q) = new", which is both more
+## cumbersome and more fragile.
+sc_tests_ls_t:
+ @if LC_ALL=C grep -E '\bls(\s+-[a-zA-Z0-9]+)*\s+-[a-zA-Z0-9]*t' \
+ $(xtests); then \
+ echo "Use 'is_newest' rather than hacks based on 'ls -t'" 1>&2; \
+ exit 1; \
+ fi
+
## Never use 'sleep 1' to create files with different timestamps.
## Use '$sleep' instead. Some filesystems (e.g., Windows) have only
## a 2sec resolution.