The Cygwin people don't stop adding regressions in the newest Cygwin
versions. Now it's reading from /dev/null that is broken. It makes
all mingw and MSVC builds fail.
This patch adds a workaround.
2025-04-14 Bruno Haible <br...@clisp.org>
select tests: Work around a Cygwin bug.
* tests/test-select-in.sh: Skip the /dev/null test on Cygwin 3.6.x.
diff --git a/tests/test-select-in.sh b/tests/test-select-in.sh
index ad86ea2526..9c74ca0c63 100755
--- a/tests/test-select-in.sh
+++ b/tests/test-select-in.sh
@@ -28,7 +28,18 @@ test `cat t-select-in.tmp` = "1" || exit 1
# Special files.
# This part of the test is known to fail on Solaris 2.6 and older.
-
+# Also it fails in Cygwin 3.6.1, due to a Cygwin regression.
+# <https://sourceware.org/pipermail/cygwin/2025-April/257940.html>
+# <https://sourceware.org/pipermail/cygwin/2025-April/257952.html>
+case `uname -s` in
+ CYGWIN*)
+ case `uname -r` in
+ 3.6.*)
+ echo "Skipping test: known Cygwin 3.6.x bug"
+ exit 77;;
+ esac
+ ;;
+esac
rm -f t-select-in.tmp
${CHECKER} ./test-select-fd${EXEEXT} r 0 t-select-in.tmp < /dev/null
test `cat t-select-in.tmp` = "1" || exit 1
