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The MITSHM extension uses SYSV IPC, but even if configure's test for IPC failed, MITSHM was still enabled by default, breaking MinGW builds by default. Unfortunately, fixing this exposes the fact that the HAVE_SYSV_IPC test wasn't being used for anything before and so we hadn't noticed it was failing on Cygwin. Change from using SHM_W|SHM_R flags (which aren't required by POSIX) to S_IRUSR|S_IWUSR flags (which are) Signed-off-by: Ryan Pavlik <rpavlik@iastate.edu> Reviewed-by: Jon TURNEY <jon.turney@dronecode.org.uk> Reviewed-by: Yaakov Selkowitz <yselkowitz@users.sourceforge.net>
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