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-rw-r--r--src/os_unix.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/os_unix.c b/src/os_unix.c
index 94e1a5357..4d902d939 100644
--- a/src/os_unix.c
+++ b/src/os_unix.c
@@ -6194,7 +6194,9 @@ RealWaitForChar(int fd, long msec, int *check_for_gpm UNUSED, int *interrupted)
struct timeval tv;
struct timeval *tvp;
- fd_set rfds, wfds, efds;
+ // These are static because they can take 8 Kbyte each and cause the
+ // signal stack to run out with -O3.
+ static fd_set rfds, wfds, efds;
int maxfd;
long towait = msec;