Here are the test results of a complete gnulib testdir on Cygwin.
Failures on both Cygwin 1.5.25 and 1.7.2
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file_has_acl("tmpdir0") returned yes, expected no
FAIL: test-file-has-acl.sh
Unconnected socket test... passed
Connected sockets test... passed
General socket test with fork... passed
Pipe test... failed (expecting POLLHUP after shutdown)
FAIL: test-poll.exe
Failures on Cygwin 1.5.25
-------------------------
rmdir: failed to remove `t-can.tmp/droot': Not a directory
test-canonicalize.c:330: assertion failed
FAIL: test-canonicalize.exe
rmdir: failed to remove `.': Device or resource busy
test-rmdir.h:44: assertion failed
FAIL: test-unlinkat.exe
rmdir: failed to remove `.': Device or resource busy
test-remove.c:60: assertion failed
FAIL: test-remove.exe
rmdir: failed to remove `test-rename.tdir': Directory not empty
test-rename.h:110: assertion failed
FAIL: test-rename.exe
rmdir: failed to remove `test-renameat.tdir': Directory not empty
test-rename.h:110: assertion failed
FAIL: test-renameat.exe
rmdir: failed to remove `.': Device or resource busy
test-rmdir.h:44: assertion failed
FAIL: test-rmdir.exe
Failures on Cygwin 1.7.2
------------------------
Starting test_cond .../bin/sh: line 5: 4200 Aborted
FAIL: test-cond.exe
Starting test_lock .../bin/sh: line 5: 2296 Aborted
FAIL: test-lock.exe
Starting test_tls .../bin/sh: line 5: 2656 Aborted
FAIL: test-tls.exe
test-btowc.c:48: assertion failed
./test-btowc1.sh: line 15: 2892 Aborted (core dumped)
LC_ALL=$LOCALE_FR ./test-btowc${EXEEXT} 1
FAIL: test-btowc1.sh
test-btowc.c:56: assertion failed
./test-btowc2.sh: line 15: 3896 Aborted (core dumped)
LC_ALL=$LOCALE_FR_UTF8 ./test-btowc${EXEEXT} 2
FAIL: test-btowc2.sh
test-mbsnrtowcs.c:181: assertion failed
./test-mbsnrtowcs2.sh: line 15: 5708 Aborted (core dumped)
LC_ALL=$LOCALE_FR_UTF8 ./test-mbsnrtowcs${EXEEXT} 2
FAIL: test-mbsnrtowcs2.sh
test-mbsrtowcs.c:181: assertion failed
./test-mbsrtowcs2.sh: line 15: 4428 Aborted (core dumped)
LC_ALL=$LOCALE_FR_UTF8 ./test-mbsrtowcs${EXEEXT} 2
FAIL: test-mbsrtowcs2.sh
