tree 9b744cef0d733197b71a2599334f78be52e025c7
parent b0917945efa374be7648d67dbbaaff323ab39edc
author Corinna Vinschen <vinschen@redhat.com> 1534172931 +0200
committer Damien Miller <djm@mindrot.org> 1534190485 -0700

configure: work around GCC shortcoming on Cygwin

Cygwin's latest 7.x GCC allows to specify -mfunction-return=thunk
as well as -mindirect-branch=thunk on the command line, albeit
producing invalid code, leading to an error at link stage.

The check in configure.ac only checks if the option is present,
but not if it produces valid code.

This patch fixes it by special-casing Cygwin.  Another solution
may be to change these to linker checks.

Signed-off-by: Corinna Vinschen <vinschen@redhat.com>