Hello, This is not specific to bison-3.4.90.
Today, i experienced 35 failures in ‘make check’ (bison-3.4.90) on Cygwin (all within output.at). Other tests (notably in diagnostics.at) would also fail if they were not skipped because of the 'locale -a’ issue fixed last week in trunk. That’s why: - My usual perl (perl5.30.0, now perl5.30.1) was broken today, therefore, when perl was needed (cf "perl -pi -e XX" in test 074 for example), the $path selected the standard /usr/bin/perl which is perl5.26.2. - You must know that perl5.28.0 changed the way they handle the "Editing in-place" functionality, in particular when <extension> (given after ‘-i') is empty. - This change was mostly transparent for everyone I know, except for Cygwin, because in the old (pre 5.28) way of working, "perl -pi -e XX foo" in Cygwin used to produce a file called ‘foo.bak’. In the new way of working, the file ‘foo.bak’ is no longer produced. - Therefore, an old perl on Cygwin produces foo.y.bak and this 'perl -pi -e XX foo.y’ targets a failure because foo.y.bak is an unexpected output of the test. To ’solve’ the problem, you may skip the tests containing ‘perl -pi -e XX' on Cygwin if perl is pre 5.28. Or otherwise. Feel free to ask more information for clarification. Regards, Denis Excoffier.