All the test scripts in the diffutils testsuite are shell scripts,
so the current definition of TESTS_ENVIRONMENT, which adaptively
run tests using either perl or the shell depending on their kind,
is an overkill.
Moreover, this change is required in order for the testsuite to
continue to work with the new testsuite harness that is planned
to be introduced in Automake 1.12 (which, as of the writing date,
is still under development and in late alpha state).
See also related discussion on bug-coreutils:
<http://debbugs.gnu.org/cgi/bugreport.cgi?bug=8887>
* tests/Makefile.am (TESTS_ENVIRONMENT): Remove definition of the
`shell_or_perl_' shell function, which is not required anymore.
(LOG_COMPILER): New, define to `$(SHELL)'.
* tests/binary: Make executable.
* tests/colliding-file-names: Likewise.
* tests/excess-slash: Likewise.
* tests/no-newline-at-eof: Likewise.
On most systems, like-named files were compared, by luck.
However, on others, different-named files would be compared
since their names were being treated as equal -- but they had
different content, so the test would fail.
* tests/colliding-file-names: Use different sets of file names
in d1 and d2 so that they cannot accidentally match.
Put the same line in each test file. This is required
when files named e.g., abc and ABC are compared.
This test was failing on a NixOS 86_64-darwin system.
Problem reported by Christoph Anton Mitterer in:
http://lists.gnu.org/archive/html/bug-diffutils/2010-08/msg00000.html
* NEWS: Mention this bug fix.
* src/dir.c (compare_names_for_qsort): Fall back on file_name_cmp
if two distinct entries in the same directory compare equal.
(diff_dirs): Prefer a file_name_cmp match when available.
* tests/Makefile.am (TESTS): New test colliding-file-names.
* tests/colliding-file-names: New file.
